Journal articles: 'Nanomaterials - Optical Sensing'

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Kumar, Santosh, Zhi Wang, Wen Zhang, Xuecheng Liu, Muyang Li, Guoru Li, Bingyuan Zhang, and Ragini Singh. "Optically Active Nanomaterials and Its Biosensing Applications—A Review." Biosensors 13, no. 1 (January 4, 2023): 85. http://dx.doi.org/10.3390/bios13010085.

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This article discusses optically active nanomaterials and their optical biosensing applications. In addition to enhancing their sensitivity, these nanomaterials also increase their biocompatibility. For this reason, nanomaterials, particularly those based on their chemical compositions, such as carbon-based nanomaterials, inorganic-based nanomaterials, organic-based nanomaterials, and composite-based nanomaterials for biosensing applications are investigated thoroughly. These nanomaterials are used extensively in the field of fiber optic biosensing to improve response time, detection limit, and nature of specificity. Consequently, this article describes contemporary and application-based research that will be of great use to researchers in the nanomaterial-based optical sensing field. The difficulties encountered during the synthesis, characterization, and application of nanomaterials are also enumerated, and their future prospects are outlined for the reader’s benefit.

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Li, Muyang, Ragini Singh, Yiran Wang, Carlos Marques, Bingyuan Zhang, and Santosh Kumar. "Advances in Novel Nanomaterial-Based Optical Fiber Biosensors—A Review." Biosensors 12, no. 10 (October 8, 2022): 843. http://dx.doi.org/10.3390/bios12100843.

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This article presents a concise summary of current advancements in novel nanomaterial-based optical fiber biosensors. The beneficial optical and biological properties of nanomaterials, such as nanoparticle size-dependent signal amplification, plasmon resonance, and charge-transfer capabilities, are widely used in biosensing applications. Due to the biocompatibility and bioreceptor combination, the nanomaterials enhance the sensitivity, limit of detection, specificity, and response time of sensing probes, as well as the signal-to-noise ratio of fiber optic biosensing platforms. This has established a practical method for improving the performance of fiber optic biosensors. With the aforementioned outstanding nanomaterial properties, the development of fiber optic biosensors has been efficiently promoted. This paper reviews the application of numerous novel nanomaterials in the field of optical fiber biosensing and provides a brief explanation of the fiber sensing mechanism.

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Speranza, Giorgio. "Carbon Nanomaterials: Synthesis, Functionalization and Sensing Applications." Nanomaterials 11, no. 4 (April 9, 2021): 967. http://dx.doi.org/10.3390/nano11040967.

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Recent advances in nanomaterial design and synthesis has resulted in robust sensing systems that display superior analytical performance. The use of nanomaterials within sensors has accelerated new routes and opportunities for the detection of analytes or target molecules. Among others, carbon-based sensors have reported biocompatibility, better sensitivity, better selectivity and lower limits of detection to reveal a wide range of organic and inorganic molecules. Carbon nanomaterials are among the most extensively studied materials because of their unique properties spanning from the high specific surface area, high carrier mobility, high electrical conductivity, flexibility, and optical transparency fostering their use in sensing applications. In this paper, a comprehensive review has been made to cover recent developments in the field of carbon-based nanomaterials for sensing applications. The review describes nanomaterials like fullerenes, carbon onions, carbon quantum dots, nanodiamonds, carbon nanotubes, and graphene. Synthesis of these nanostructures has been discussed along with their functionalization methods. The recent application of all these nanomaterials in sensing applications has been highlighted for the principal applicative field and the future prospects and possibilities have been outlined.

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Sondhi, Palak, Md Helal Uddin Maruf, and Keith J. Stine. "Nanomaterials for Biosensing Lipopolysaccharide." Biosensors 10, no. 1 (December 21, 2019): 2. http://dx.doi.org/10.3390/bios10010002.

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Lipopolysaccharides (LPS) are endotoxins, hazardous and toxic inflammatory stimulators released from the outer membrane of Gram-negative bacteria, and are the major cause of septic shock giving rise to millions of fatal illnesses worldwide. There is an urgent need to identify and detect these molecules selectively and rapidly. Pathogen detection has been done by traditional as well as biosensor-based methods. Nanomaterial based biosensors can assist in achieving these goals and have tremendous potential. The biosensing techniques developed are low-cost, easy to operate, and give a fast response. Due to extremely small size, large surface area, and scope for surface modification, nanomaterials have been used to target various biomolecules, including LPS. The sensing mechanism can be quite complex and involves the transformation of chemical interactions into amplified physical signals. Many different sorts of nanomaterials such as metal nanomaterials, magnetic nanomaterials, quantum dots, and others have been used for biosensing of LPS and have shown attractive results. This review considers the recent developments in the application of nanomaterials in sensing of LPS with emphasis given mainly to electrochemical and optical sensing.

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Rezk, Marwan Y., Jyotsna Sharma, and Manas Ranjan Gartia. "Nanomaterial-Based CO2 Sensors." Nanomaterials 10, no. 11 (November 13, 2020): 2251. http://dx.doi.org/10.3390/nano10112251.

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The detection of carbon dioxide (CO2) is critical for environmental monitoring, chemical safety control, and many industrial applications. The manifold application fields as well as the huge range of CO2 concentration to be measured make CO2 sensing a challenging task. Thus, the ability to reliably and quantitatively detect carbon dioxide requires vastly improved materials and approaches that can work under different environmental conditions. Due to their unique favorable chemical, optical, physical, and electrical properties, nanomaterials are considered state-of-the-art sensing materials. This mini-review documents the advancement of nanomaterial-based CO2 sensors in the last two decades and discusses their strengths, weaknesses, and major applications. The use of nanomaterials for CO2 sensing offers several improvements in terms of selectivity, sensitivity, response time, and detection, demonstrating the advantage of using nanomaterials for developing high-performance CO2 sensors. Anticipated future trends in the area of nanomaterial-based CO2 sensors are also discussed in light of the existing limitations.

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Zhang, Wenjia, Xingyu Zi, Jinqiang Bi, Guohua Liu, Hongen Cheng, Kexin Bao, Liu Qin, and Wei Wang. "Plasmonic Nanomaterials in Dark Field Sensing Systems." Nanomaterials 13, no. 13 (July 7, 2023): 2027. http://dx.doi.org/10.3390/nano13132027.

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Plasma nanoparticles offer promise in data storage, biosensing, optical imaging, photoelectric integration, etc. This review highlights the local surface plasmon resonance (LSPR) excitation mechanism of plasmonic nanoprobes and its critical significance in the control of dark-field sensing, as well as three main sensing strategies based on plasmonic nanomaterial dielectric environment modification, electromagnetic coupling, and charge transfer. This review then describes the component materials of plasmonic nanoprobes based on gold, silver, and other noble metals, as well as their applications. According to this summary, researchers raised the LSPR performance of composite plasmonic nanomaterials by combining noble metals with other metals or oxides and using them in process analysis and quantitative detection.

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Turel, Matejka, Tinkara Mastnak, and Aleksandra Lobnik. "Optical Chemical Nanosensors in Clinical Applications." Defect and Diffusion Forum 334-335 (February 2013): 387–96. http://dx.doi.org/10.4028/www.scientific.net/ddf.334-335.387.

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Because of their size and versatile chemistry, nanomaterials represent today powerful tools for (bio) sensing applications. Various types of nanomaterials have proven to be practical, not only for the determination of clinically relevant parameters, but also for diagnostics, drug delivery and treatment of diseases (e.g. cancer). In this short review, types of nanomaterials used in medical applications are briefly described along with some of their applications where the nanomaterials optical properties can be exploited. The question of the toxicity of nanomaterials and the issue of future trends are also raised.

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Zhong, Zhi-Cheng, Zhao-Jun Jing, Kui-Yuan Liu, and Tong Liu. "Acetylene Sensing by ZnO/TiO2 Nanoparticles." Journal of Nanoelectronics and Optoelectronics 15, no. 1 (January 1, 2020): 41–45. http://dx.doi.org/10.1166/jno.2020.2726.

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We adopted the sol–gel and hydrothermal methods to prepare the TiO2 nanomaterials doped with ZnO. We adopted X-ray diffraction, scanning electron microscopy, and the Brunauer–Emmett–Teller method to investigate the materials’ structures and morphologies. The results showed that the prepared TiO2 nanomaterials had uniform size and good dispersibility. Gas sensors were fabricated and their performances in acetylene sensing were assessed. The results show that the sensor prepared with the ZnO/TiO2 nanomaterial doped with 10 wt% ZnO gave fast response and recovery times for acetylene gas at different concentrations. When the operating temperature was 280 °C, the gas sensor detected 200 ppm acetylene gas with a response sensitivity of 9.9, a response time of 5 s, and a recovery time of 2 s.

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Lobnik, Aleksandra, and Špela Korent Urek. "Nano-Based Optical Chemical Sensors." Journal of Nano Research 13 (February 2011): 99–110. http://dx.doi.org/10.4028/www.scientific.net/jnanor.13.99.

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The development of nanoscale materials for optical chemical sensing applications has emerged as one of the most important research areas of interest over the past decades. Nanomaterials exhibit highly tunable size- and shape-dependent chemical and physical properties, show unique surface chemistry, thermal and electrical properties, high surface area and large pore volume per mass unit area. Because of their unique and advantageous features they can help to improve sensitivity, response time and detection limit of sensors. In this review, recently developed photoluminescence-based optical chemical nanosensors are presented. Some future trends of the nanomaterial-based optical chemical sensors are given.

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Chen, Bing, Qianqian Su, Wei Kong, Yuan Wang, Peng Shi, and Feng Wang. "Energy transfer-based biodetection using optical nanomaterials." Journal of Materials Chemistry B 6, no. 19 (2018): 2924–44. http://dx.doi.org/10.1039/c8tb00614h.

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Devasena, T., N. Balasubramanian, Natarajan Muninathan, Kuppusamy Baskaran, and Shani T. John. "Curcumin Is an Iconic Ligand for Detecting Environmental Pollutants." Bioinorganic Chemistry and Applications 2022 (March 27, 2022): 1–12. http://dx.doi.org/10.1155/2022/9248988.

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The rapid increase in industrial revolution and the consequent environmental contamination demands continuous monitoring and sensitive detection of the pollutants. Nanomaterial-based sensing system has proved to be proficient in sensing environmental pollutants. The development of novel ligands for enhancing the sensing efficiency of nanomaterials has always been a challenge. However, the amendment of nanostructure with molecular ligand increases the sensitivity, selectivity, and analytical performance of the resulting novel sensing platform. Organic ligands are capable of increasing the adsorption efficacy, optical properties, and electrochemical properties of nanomaterials by reducing or splitting of band gap. Curcumin (diferuloylmethane) is a natural organic ligand that exhibits inherent fluorescence and electrocatalytic property. Due to keto-enol tautomerism, it is capable of giving sensitive signals such as fluorescence, luminescence, ultraviolet absorption shifts, and electrochemical data. Curcumin probes were also reported to give enhanced meterological performances, such as low detection limit, repeatability, reproducibility, high selectivity, and high storage stability when used with nanosystem. Therefore, research on curcumin-modified nanomaterials in the detection of environmental pollution needs a special focus for prototype and product development to enable practical use. Hence, this article reviews the role of curcumin as a natural fluorophore in optical and electrochemical sensing of environmentally significant pollutants. This review clearly shows that curcumin is an ideal candidate for developing and validating nanomaterials-based sensors for the detection of environmental pollutants such as arsenic, lead, mercury, boron, cyanide, fluoride, nitrophenol, trinitrotoluene, and picric acid and toxic gases such as ammonia and hydrogen chloride. This review will afford references for future studies and enable researchers to translate the lab concepts into industrial products.

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Qiao, Xiujuan, Jingyi He, Ruixi Yang, Yanhui Li, Gengjia Chen, Sanxiong Xiao, Bo Huang, Yahong Yuan, Qinglin Sheng, and Tianli Yue. "Recent Advances in Nanomaterial-Based Sensing for Food Safety Analysis." Processes 10, no. 12 (December 3, 2022): 2576. http://dx.doi.org/10.3390/pr10122576.

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The increasing public attention on unceasing food safety incidents prompts the requirements of analytical techniques with high sensitivity, reliability, and reproducibility to timely prevent food safety incidents occurring. Food analysis is critically important for the health of both animals and human beings. Due to their unique physical and chemical properties, nanomaterials provide more opportunities for food quality and safety control. To date, nanomaterials have been widely used in the construction of sensors and biosensors to achieve more accurate, fast, and selective food safety detection. Here, various nanomaterial-based sensors for food analysis are outlined, including optical and electrochemical sensors. The discussion mainly involves the basic sensing principles, current strategies, and novel designs. Additionally, given the trend towards portable devices, various smartphone sensor-based point-of-care (POC) devices for home care testing are discussed.

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Lu, Danqing, Lei He, Ge Zhang, Aiping Lv, Ruowen Wang, Xiaobing Zhang, and Weihong Tan. "Aptamer-assembled nanomaterials for fluorescent sensing and imaging." Nanophotonics 6, no. 1 (January 6, 2017): 109–21. http://dx.doi.org/10.1515/nanoph-2015-0145.

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AbstractAptamers, which are selected in vitro by a technology known as the systematic evolution of ligands by exponential enrichment (SELEX), represent a crucial recognition element in molecular sensing. With advantages such as good biocompatibility, facile functionalization, and special optical and physical properties, various nanomaterials can protect aptamers from enzymatic degradation and nonspecific binding in living systems and thus provide a preeminent platform for biochemical applications. Coupling aptamers with various nanomaterials offers many opportunities for developing highly sensitive and selective sensing systems. Here, we focus on the recent applications of aptamer-assembled nanomaterials in fluorescent sensing and imaging. Different types of nanomaterials are examined along with their advantages and disadvantages. Finally, we look toward the future of aptamer-assembled nanomaterials.

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Dang, Chao, Mingyang Liu, Zhiwei Lin, and Wei Yan. "Selenium nanomaterials enabled flexible and wearable electronics." Chemical Synthesis 3, no. 2 (2023): 14. http://dx.doi.org/10.20517/cs.2022.33.

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Selenium (Se), as an intriguing chalcogenide semiconductor, has traditionally been used for solar energy harvesting. The recent development of nanoscience and nanotechnology has enabled a myriad of Se nanomaterials with compelling structures and unique features. Compared with other chalcogens, Se nanomaterials possess anisotropic crystalline structure, intrinsic chirality, and high reactivity, as well as unique optical, electrical, photoconductive, and piezoelectrical properties. The integration of these Se nanomaterials with technologically important materials, such as conductors and semiconductors, over flexible, bendable, stretchable, and highly curved substrates offer a new generation of Se nanomaterial-based flexible and wearable electronics. In this mini review, we survey the recent scientific and technological breakthroughs in Se nanomaterials-enabled flexible and wearable electronics. We highlight the synthesis, fabrication, morphologies, structure, and properties (optical, electrical, optoelectrical, photovoltaic, and piezoelectric) of Se nanomaterials as well as their integration into innovative functional devices that deliver higher forms of applications across smart sensing, health care, and energy domains. We conclude with a critical analysis of existing challenges and opportunities that will trigger the continued progress of the field.

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Marques, Carlos, Arnaldo Leal-Júnior, and Santosh Kumar. "Multifunctional Integration of Optical Fibers and Nanomaterials for Aircraft Systems." Materials 16, no. 4 (February 8, 2023): 1433. http://dx.doi.org/10.3390/ma16041433.

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Smart sensing for aeronautical applications is a multidisciplinary process that involves the development of various sensor elements and advancements in the nanomaterials field. The expansion of research has fueled the development of commercial and military aircrafts in the aeronautical field. Optical technology is one of the supporting pillars for this, as well as the fact that the unique high-tech qualities of aircrafts align with sustainability criteria. In this study, a multidisciplinary investigation of airplane monitoring systems employing optical technologies based on optical fiber and nanomaterials that are incorporated into essential systems is presented. This manuscript reports the multifunctional integration of optical fibers and nanomaterials for aircraft sector discussing topics, such as airframe monitoring, flight environment sensing (from temperature and humidity to pressure sensing), sensors for navigation (such as gyroscopes and displacement or position sensors), pilot vital health monitoring, and novel nanomaterials for aerospace applications. The primary objective of this review is to provide researchers with direction and motivation to design and fabricate the future of the aeronautical industry, based on the actual state of the art of such vital technology, thereby aiding their future research.

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Zhou, Jie, Jiajie Chen, Yanqi Ge, and Yonghong Shao. "Two-dimensional nanomaterials for Förster resonance energy transfer–based sensing applications." Nanophotonics 9, no. 7 (April 1, 2020): 1855–75. http://dx.doi.org/10.1515/nanoph-2020-0065.

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AbstractFörster resonance energy transfer (FRET)–based sensing has been steadily gaining popularity in the areas of biochemical analysis, environmental monitoring, and disease diagnosis in the past 20 years. Two-dimensional (2D) nanomaterials are extensively used as donors and acceptors in the FRET sensing because of their attractive optical and chemical properties. In this review, we first present the FRET theory and calculations to give readers a better understanding of the FRET phenomenon. Then, we discuss the recent research advances in using 2D nanomaterials as donors and acceptor in FRET sensing. Finally, we summarize the existing challenges and future directions of 2D nanomaterials in the FRET sensing applications.

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Basso, Caroline R., Bruno P. Crulhas, Gustavo R. Castro, and Valber A. Pedrosa. "Recent Advances in Functional Nanomaterials for Diagnostic and Sensing Using Self-Assembled Monolayers." International Journal of Molecular Sciences 24, no. 13 (June 28, 2023): 10819. http://dx.doi.org/10.3390/ijms241310819.

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Functional nanomaterials have attracted attention by producing different structures in any field. These materials have several potential applications, including medicine, electronics, and energy, which provide many unique properties. These nanostructures can be synthesized using various methods, including self-assembly, which can be used for the same applications. This unique nanomaterial is increasingly being used for biological detection due to its unique optical, electrical, and mechanical properties, which provide sensitive and specific sensors for detecting biomolecules such as DNA, RNA, and proteins. This review highlights recent advances in the field and discusses the fabrication and characterization of the corresponding materials, which can be further applied in optical, magnetic, electronic, and sensor fields.

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Alsaiari, Norah Salem, Khadijah Mohammedsaleh M. Katubi, Fatimah Mohammed Alzahrani, Saifeldin M. Siddeeg, and Mohamed A. Tahoon. "The Application of Nanomaterials for the Electrochemical Detection of Antibiotics: A Review." Micromachines 12, no. 3 (March 15, 2021): 308. http://dx.doi.org/10.3390/mi12030308.

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Antibiotics can accumulate through food metabolism in the human body which may have a significant effect on human safety and health. It is therefore highly beneficial to establish easy and sensitive approaches for rapid assessment of antibiotic amounts. In the development of next-generation biosensors, nanomaterials (NMs) with outstanding thermal, mechanical, optical, and electrical properties have been identified as one of the most hopeful materials for opening new gates. This study discusses the latest developments in the identification of antibiotics by nanomaterial-constructed biosensors. The construction of biosensors for electrochemical signal-transducing mechanisms has been utilized in various types of nanomaterials, including quantum dots (QDs), metal-organic frameworks (MOFs), magnetic nanoparticles (NPs), metal nanomaterials, and carbon nanomaterials. To provide an outline for future study directions, the existing problems and future opportunities in this area are also included. The current review, therefore, summarizes an in-depth assessment of the nanostructured electrochemical sensing method for residues of antibiotics in different systems.

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Li, Kaiwei, Wenchao Zhou, and Shuwen Zeng. "Optical Micro/Nanofiber-Based Localized Surface Plasmon Resonance Biosensors: Fiber Diameter Dependence." Sensors 18, no. 10 (September 30, 2018): 3295. http://dx.doi.org/10.3390/s18103295.

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Integration of functional nanomaterials with optical micro/nanofibers (OMNFs) can bring about novel optical properties and provide a versatile platform for various sensing applications. OMNFs as the key element, however, have seldom been investigated. Here, we focus on the optimization of fiber diameter by taking micro/nanofiber-based localized surface plasmon resonance sensors as a model. We systematically study the dependence of fiber diameter on the sensing performance of such sensors. Both theoretical and experimental results show that, by reducing fiber diameter, the refractive index sensitivity can be significantly increased. Then, we demonstrate the biosensing capability of the optimized sensor for streptavidin detection and achieve a detection limit of 1 pg/mL. Furthermore, the proposed theoretical model is applicable to other nanomaterials and OMNF-based sensing schemes for performance optimization.

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Rajamanikandan, Ramar, Kandasamy Sasikumar, Saikiran Kosame, and Heongkyu Ju. "Optical Sensing of Toxic Cyanide Anions Using Noble Metal Nanomaterials." Nanomaterials 13, no. 2 (January 10, 2023): 290. http://dx.doi.org/10.3390/nano13020290.

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Water toxicity, one of the major concerns for ecosystems and the health of humanity, is usually attributed to inorganic anions-induced contamination. Particularly, cyanide ions are considered one of the most harmful elements required to be monitored in water. The need for cyanide sensing and monitoring has tempted the development of sensing technologies without highly sophisticated instruments or highly skilled operations for the objective of in-situ monitoring. Recent decades have witnessed the growth of noble metal nanomaterials-based sensors for detecting cyanide ions quantitatively as nanoscience and nanotechnologies advance to allow nanoscale-inherent physicochemical properties to be exploited for sensing performance. Particularly, noble metal nanostructure e-based optical sensors have permitted cyanide ions of nanomolar levels, or even lower, to be detectable. This capability lends itself to analytical application in the quantitative detection of harmful elements in environmental water samples. This review covers the noble metal nanomaterials-based sensors for cyanide ions detection developed in a variety of approaches, such as those based on colorimetry, fluorescence, Rayleigh scattering (RS), and surface-enhanced Raman scattering (SERS). Additionally, major challenges associated with these nano-platforms are also addressed, while future perspectives are given with directions towards resolving these issues.

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Wang, Yi-Han, Liu-Liu He, Ke-Jing Huang, Ying-Xu Chen, Shu-Yu Wang, Zhen-Hua Liu, and Dan Li. "Recent advances in nanomaterial-based electrochemical and optical sensing platforms for microRNA assays." Analyst 144, no. 9 (2019): 2849–66. http://dx.doi.org/10.1039/c9an00081j.

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Bhalla, Nikhil, and Pedro Estrela. "Exploiting the signatures of nanoplasmon–exciton coupling on proton sensitive insulator–semiconductor devices for drug discovery applications." Nanoscale 10, no. 28 (2018): 13320–28. http://dx.doi.org/10.1039/c8nr04540b.

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Cennamo, Nunzio, Francesco Arcadio, Fiore Capasso, Devid Maniglio, Luigi Zeni, and Alessandra Maria Bossi. "Non-Specific Responsive Nanogels and Plasmonics to Design MathMaterial Sensing Interfaces: The Case of a Solvent Sensor." Sensors 22, no. 24 (December 19, 2022): 10006. http://dx.doi.org/10.3390/s222410006.

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The combination of non-specific deformable nanogels and plasmonic optical probes provides an innovative solution for specific sensing using a generalistic recognition layer. Soft polyacrylamide nanogels that lack specific selectivity but are characterized by responsive behavior, i.e., shrinking and swelling dependent on the surrounding environment, were grafted to a gold plasmonic D-shaped plastic optical fiber (POF) probe. The nanogel–POF cyclically challenged with water or alcoholic solutions optically reported the reversible solvent-to-phase transitions of the nanomaterial, embodying a primary optical switch. Additionally, the non-specific nanogel–POF interface exhibited more degrees of freedom through which specific sensing was enabled. The real-time monitoring of the refractive index variations due to the time-related volume-to-phase transition effects of the nanogels enabled us to determine the environment’s characteristics and broadly classify solvents. Hence the nanogel–POF interface was a descriptor of mathematical functions for substance identification and classification processes. These results epitomize the concept of responsive non-specific nanomaterials to perform a multiparametric description of the environment, offering a specific set of features for the processing stage and particularly suitable for machine and deep learning. Thus, soft MathMaterial interfaces provide the ground to devise devices suitable for the next generation of smart intelligent sensing processes.

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Xu, Zhida, Meng Lu, Hyunjong Jin, Tao Chen, and Tiziana C. Bond. "Nanomaterials for Optical Sensing and Sensors: Plasmonics, Raman, and Optofluidics." Journal of Nanomaterials 2015 (2015): 1–3. http://dx.doi.org/10.1155/2015/162537.

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Ly, Nguyễn Hoàng, Sang Jun Son, Soonmin Jang, Cheolmin Lee, Jung Il Lee, and Sang-Woo Joo. "Surface-Enhanced Raman Sensing of Semi-Volatile Organic Compounds by Plasmonic Nanostructures." Nanomaterials 11, no. 10 (October 5, 2021): 2619. http://dx.doi.org/10.3390/nano11102619.

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Facile detection of indoor semi-volatile organic compounds (SVOCs) is a critical issue to raise an increasing concern to current researchers, since their emissions have impacted the health of humans, who spend much of their time indoors after the recent incessant COVID-19 pandemic outbreaks. Plasmonic nanomaterial platforms can utilize an electromagnetic field to induce significant Raman signal enhancements of vibrational spectra of pollutant molecules from localized hotspots. Surface-enhanced Raman scattering (SERS) sensing based on functional plasmonic nanostructures has currently emerged as a powerful analytical technique, which is widely adopted for the ultra-sensitive detection of SVOC molecules, including phthalates and polycyclic aromatic hydrocarbons (PAHs) from household chemicals in indoor environments. This concise topical review gives updated recent developments and trends in optical sensors of surface plasmon resonance (SPR) and SERS for effective sensing of SVOCs by functionalization of noble metal nanostructures. Specific features of plasmonic nanomaterials utilized in sensors are evaluated comparatively, including their various sizes and shapes. Novel aptasensors-assisted SERS technology and its potential application are also introduced for selective sensing. The current challenges and perspectives on SERS-based optical sensors using plasmonic nanomaterial platforms and aptasensors are discussed for applying indoor SVOC detection.

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Vajhadin, Fereshteh, Mohammad Mazloum-Ardakani, Alireza Sanati, Reihaneh Haghniaz, and Jadranka Travas-Sejdic. "Optical cytosensors for the detection of circulating tumour cells." Journal of Materials Chemistry B 10, no. 7 (2022): 990–1004. http://dx.doi.org/10.1039/d1tb02370e.

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In this review, we provide an overview of the recent advances in optical cytosensors, including those utilizing the unique properties of nanomaterials. Optical cytosensors are expected to provide economical, sensitive, and portable sensing platforms that can be used for advanced cancer cell monitoring.

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Tran Ngoc Lan, Nguyen Tran Thuat, Hoang Ngoc Lam Huong, and Nguyen Van Quynh. "Effects of silver incorporation on electrical and optical properties of CuAlxOy thin films." Journal of Military Science and Technology, FEE (December 23, 2022): 294–302. http://dx.doi.org/10.54939/1859-1043.j.mst.fee.2022.294-302.

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The transparent conductive property based on Ag-doped delafossite nanomaterials are attractive for optical sensing applications due to their good electrical conductivity, good optical transparent and high temperature coefficient of resistance. Several delafossite nanomaterials and Ag-doped nanomaterials have been reported, however, Ag-doped delafossite nanomaterials have not been explored, especially regarding the electrical property with high temperature coefficient of resistance. In this study, Ag-doped delafossite CuAlxOy thin films were deposited by co-sputtering techniques. The electrical properties were carried out on a 4-point prober. The optical properties were characterized on an UV-VIS spectrometer. The results on CuAlxOy doped Ag thin films showed that CuAlxOy doped Ag can be hardly applied for transparent conductive layers. However, these films exhibited relatively high temperature coefficient of resistance of about 3%/K, thus being suitable for applications in microbolometers.

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Łysoń-Sypień, B., K. Zakrzewska, M. Gajewska, and M. Radecka. "Hydrogen Sensor Of TiO2-Based Nanomaterials." Archives of Metallurgy and Materials 60, no. 2 (June 1, 2015): 935–40. http://dx.doi.org/10.1515/amm-2015-0233.

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Abstract The aim of this research was to examine gas sensing properties of TiO2 based nanomaterials. Nanopowders of Cr doped TiO2 with constant Specific Surface Area, SSA, were obtained using Flame Spray Synthesis technique, FSS. Nanomaterials were characterized by Brunauer – Emmett – Teller adsorption isotherms, BET, X – ray diffraction, XRD, Transmission Electron Microscopy, TEM, optical spectrometry UV – vis with the use of an integrating sphere as well as impedance spectroscopy. Detection of hydrogen was carried out over the concentration range of 50 - 3000 ppm at the temperatures extending from 200 to 400°C and synthetic air working as a reference atmosphere. As a result of experiments it appeared that incorporation of 5 at.% of Cr into TiO2 improved hydrogen sensing features due to small crystallite size and predominance of rutile polymorphic phase.

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Bagheri, Samira, Amin TermehYousefi, and Javad Mehrmashhadi. "Carbon dot-based fluorometric optical sensors: an overview." Reviews in Inorganic Chemistry 39, no. 4 (December 18, 2019): 179–97. http://dx.doi.org/10.1515/revic-2019-0002.

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AbstractFluorescent carbon dots (CDs) are a new class of carbon nanomaterials and have demonstrated excellent optical properties, good biocompatibility, great aqueous solubility, low cost, and simple synthesis. Since their discovery, various synthesis methods using different precursors were developed, which were mainly classified as top-down and bottom-up approaches. CDs have presented many applications, and this review article mainly focuses on the development of CD-based fluorescent sensors. The sensing mechanisms, sensor design, and sensing properties to various targets are summarized. Broad ranges of detection, including temperature, pH, DNA, antibiotics, cations, cancer cells, and antibiotics, have been discussed. In addition, the challenges and future directions for CDs as sensing materials are also presented.

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Yadav, Sangeeta, Sheethal S. Nair, V. V. R. Sai, and Jitendra Satija. "Nanomaterials based optical and electrochemical sensing of histamine: Progress and perspectives." Food Research International 119 (May 2019): 99–109. http://dx.doi.org/10.1016/j.foodres.2019.01.045.

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Upadhyay, S. B., and P. P. Sahay. "Structure, Optical and Formaldehyde Sensing Properties of Co-Precipitated Fe-Doped WO3 Nanomaterials." Nano 10, no. 08 (November 23, 2015): 1550113. http://dx.doi.org/10.1142/s1793292015501131.

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Co-precipitated undoped and Fe-doped WO3 nanomaterials have been investigated by X-ray diffraction, Raman spectroscopy and scanning electron microscopy in order to study the influence of Fe doping in their structural and morphological properties. The synthesized WO3 nanomaterials have been found to possess monoclinic structure having average crystallite sizes 15–20[Formula: see text]nm. The diffuse reflectance spectroscopy shows the optical bandgap [Formula: see text]2.85[Formula: see text]eV. The 1.8 at.% Fe-doped WO3 exhibits selective high response to formaldehyde over methanol, ethanol, propan-2-ol and acetone. It exhibits the maximum response ([Formula: see text]80%) to formaldehyde at the operating temperature of 225[Formula: see text]C for 50[Formula: see text]ppm concentration in air.

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Kałużyński, Piotr Dariusz, Marcin Procek, and Agnieszka Stolarczyk. "Impact of UV radiation on sensing properties of conductive polymer and ZnO blend for NO2 gas sensing at room temperature." Photonics Letters of Poland 11, no. 3 (September 30, 2019): 69. http://dx.doi.org/10.4302/plp.v11i3.911.

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In this paper we present an investigation on UV radiation on organic-inorganic blend made from conductive polymer (regio-regular poly(3-hexyltiophene) (rr-P3HT) and zinc oxide (ZnO) nanomaterial, which was used as a sensing layer for chemoresistor structure. The study showed that UV radiation has a significant impact on the dynamics of the response of the sensor being studied, which can be a significant element to improve the operation of such sensors at room temperature. Full Text: PDF ReferencesKampa, M.., Castanas, E., "Human health effects of air pollution," Environ. Pollut. 151(2), 362-367 (2008). CrossRef Procek, M., Stolarczyk, A., Pustelny, T.., Maciak, E., "A Study of a QCM Sensor Based on TiO2 Nanostructures for the Detection of NO2 and Explosives Vapours in Air.," Sensors (Basel). 15(4), 9563-9581, MDPI AG (2015). CrossRef Procek M., Stolarczyk A., "Influence of near UV irradiation on ZnO nanomaterials NO2 gas sensing properties," Proc. SPIE 10830, 13th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods, 108300P (14 August 2018); doi: 10.1117/12.2503471 CrossRef Procek M., Stolarczyk A., Maciak E., "Study of the impact ofUV radiation on NO2 sensing properties of graft comb copolymers of poly(3-hexylthiophene) at room temperature," Proc. SPIE 10455, 12th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods, 104550N (1 September 2017); doi: 10.1117/12.2282777 CrossRef Djurišić, A.B. & Ng, Alan Man Ching & Chen, Xinyi. (2010). ZnO Nanostructures for Optoelectronics: Material Properties and Device Applications. Progress in Quantum Electronics. 34. 191-259. 10.1016/j.pquantelec.2010.04.001. CrossRef Xie, Tao & Xie, Guangzhong & Du, Hongfei & Su, Yuanjie & Ye, Zongbiao & Chen, Yuyan & Jiang, Yadong. (2015). Two novel methods for evaluating the performance of OTFT gas sensors. Sensors and Actuators B: Chemical. 230. 10.1016/j.snb.2015.12.056. CrossRef Procek, M.; Stolarczyk, A.; Pustelny, T. Impact of Temperature and UV Irradiation on Dynamics of NO2 Sensors Based on ZnO Nanostructures. Nanomaterials 2017, 7, 312. CrossRef

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Gupta, Banshi D., Anisha Pathak, and Vivek Semwal. "Carbon-Based Nanomaterials for Plasmonic Sensors: A Review." Sensors 19, no. 16 (August 13, 2019): 3536. http://dx.doi.org/10.3390/s19163536.

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The surface plasmon resonance (SPR) technique is a remarkable tool, with applications in almost every area of science and technology. Sensing is the foremost and majorly explored application of SPR technique. The last few decades have seen a surge in SPR sensor research related to sensitivity enhancement and innovative target materials for specificity. Nanotechnological advances have augmented the SPR sensor research tremendously by employing nanomaterials in the design of SPR-based sensors, owing to their manifold properties. Carbon-based nanomaterials, like graphene and its derivatives (graphene oxide (GO)), (reduced graphene oxide (rGO)), carbon nanotubes (CNTs), and their nanocomposites, have revolutionized the field of sensing due to their extraordinary properties, such as large surface area, easy synthesis, tunable optical properties, and strong compatible adsorption of biomolecules. In SPR based sensors carbon-based nanomaterials have been used to act as a plasmonic layer, as the sensitivity enhancement material, and to provide the large surface area and compatibility for immobilizing various biomolecules, such as enzymes, DNA, antibodies, and antigens, in the design of the sensing layer. In this review, we report the role of carbon-based nanomaterials in SPR-based sensors, their current developments, and challenges.

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Szunerits, Sabine, Tamazouzt Nait Saada, Dalila Meziane, and Rabah Boukherroub. "Magneto-Optical Nanostructures for Viral Sensing." Nanomaterials 10, no. 7 (June 29, 2020): 1271. http://dx.doi.org/10.3390/nano10071271.

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The eradication of viral infections is an ongoing challenge in the medical field, as currently evidenced with the newly emerged Coronavirus disease 2019 (COVID-19) associated with severe respiratory distress. As treatments are often not available, early detection of an eventual infection and its level becomes of outmost importance. Nanomaterials and nanotechnological approaches are increasingly used in the field of viral sensing to address issues related to signal-to-noise ratio, limiting the sensitivity of the sensor. Superparamagnetic nanoparticles (MPs) present one of the most exciting prospects for magnetic bead-based viral aggregation assays and their integration into different biosensing strategies as they can be easily separated from a complex matrix containing the virus through the application of an external magnetic field. Despite the enormous potential of MPs as capture/pre-concentrating elements, they are not ideal with regard of being active elements in sensing applications as they are not the sensor element itself. Even though engineering of magneto-plasmonic nanostructures as promising hybrid materials directly applicable for sensing due to their plasmonic properties are often used in sensing, to our surprise, the literature of magneto-plasmonic nanostructures for viral sensing is limited to some examples. Considering the wide interest this topic is evoking at present, the different approaches will be discussed in more detail and put into wider perspectives for sensing of viral disease markers.

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Owolabi, Taoreed O., Tawfik A. Saleh, Olubosede Olusayo, Miloud Souiyah, and Oluwatoba Emmanuel Oyeneyin. "Modeling the Specific Surface Area of Doped Spinel Ferrite Nanomaterials Using Hybrid Intelligent Computational Method." Journal of Nanomaterials 2021 (August 18, 2021): 1–13. http://dx.doi.org/10.1155/2021/9677423.

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Spinel ferrites nanomaterials are magnetic semiconductors with excellent chemical, magnetic, electrical, and optical properties which have rendered the materials useful in many technological driven applications such as solar hydrogen production, data storage, magnetic sensing, converters, inductors, spintronics, and catalysts. The surface area of these nanomaterials contributes significantly to their targeted applications as well as the observed physical and chemical features. Experimental doping has shown a great potential in enhancing and tuning the specific surface area of spinel ferrite nanomaterials while the attributed experimental challenges call for viable theoretical model that can estimate the surface area of doped spinel ferrite nanomaterials with high degree of precision. This work develops stepwise regression (STWR) and hybrid genetic algorithm-based support vector regression (GBSVR) intelligent model for estimating specific surface area of doped spinel ferrite nanomaterials using lattice parameter and the size of nanoparticle as descriptors to the models. The developed hybrid GBSVR model performs better than STWR model with the performance improvement of 7.51% and 22.68%, respectively, using correlation coefficient and root mean square error as performance metrics when validated with experimentally measured specific surface area of doped spinel ferrite nanomaterials. The developed GBSVR model investigates the influence of nickel, yttrium, and lanthanum nanoparticles on the specific surface area of different classes of spinel ferrite nanomaterials, and the obtained results agree excellently well with the measured values. The accuracy and precision characterizing the developed model would be of immense importance in enhancing specific surface area of doped spinel ferrite nanomaterial prediction with circumvention of experimental stress coupled with reduced cost.

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Pan, Mingfei, Jingying Yang, Kaixin Liu, Zongjia Yin, Tianyu Ma, Shengmiao Liu, Longhua Xu, and Shuo Wang. "Noble Metal Nanostructured Materials for Chemical and Biosensing Systems." Nanomaterials 10, no. 2 (January 25, 2020): 209. http://dx.doi.org/10.3390/nano10020209.

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Nanomaterials with unique physical and chemical properties have attracted extensive attention of scientific research and will play an increasingly important role in the future development of science and technology. With the gradual deepening of research, noble metal nanomaterials have been applied in the fields of new energy materials, photoelectric information storage, and nano-enhanced catalysis due to their unique optical, electrical and catalytic properties. Nanostructured materials formed by noble metal elements (Au, Ag, etc.) exhibit remarkable photoelectric properties, good stability and low biotoxicity, which received extensive attention in chemical and biological sensing field and achieved significant research progress. In this paper, the research on the synthesis, modification and sensing application of the existing noble metal nanomaterials is reviewed in detail, which provides a theoretical guidance for further research on the functional properties of such nanostructured materials and their applications of other nanofields.

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Juang, Feng-Renn, Yi-Hsiang Huang, Hung-Chieh Lan, and Ming-Che Tsai. "Nanocomposite of Tin Oxide and Tungsten Oxide for Ethanol Sensing Applications." ECS Journal of Solid State Science and Technology 11, no. 4 (April 1, 2022): 045013. http://dx.doi.org/10.1149/2162-8777/ac6698.

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Tungsten oxide (WO3) and tin oxide (SnO2) nanostructures are hydrothermally synthesized in this research. Fabrication process is simple and inexpensive. The nanomaterials are analyzed and proved that they are with high purity and high crystallinity through different techniques. By combining these two nanomaterials, the SnO2/WO3 nanocomposite is made into an ethanol gas sensor. Not only large surface area but also a heterojunction between SnO2 and WO3 enhance the sensing ability of the sensor. It has high sensing response ratio of 262.61% to 100 ppm ethanol gas at 120 °C. Fast response and recovery times are also worth noting. The fabricated gas sensor can help detecting ethanol concentration in different fields.

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Chen, Shu, Yawen Wang, Xiuli Liu, and Longhua Ding. "Recent Advances for Imidacloprid Detection Based on Functional Nanomaterials." Chemosensors 11, no. 5 (May 18, 2023): 300. http://dx.doi.org/10.3390/chemosensors11050300.

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Imidacloprid (IMI) has been applied in agricultural production to prevent pests. It is vital to detect IMI residues with high sensitivity for food safety. In general, nanomaterials have driven the development of highly sensitive sensing platforms owing to their unique physical and chemical properties. Nanomaterials play important roles in the construction of high-performance sensors, mainly through sample pretreatment and purification, recognition molecules immobilization, signal amplification, and providing catalytic active sites. This review addresses the advances in IMI sensors based on the combination of nanomaterials and various analytical techniques. The design principles and performance of different chromatographic, electrochemical, and fabricated optical sensors coupled with nanomaterials are discussed. Finally, the challenges and prospects of sensors based on nanomaterials for IMI analysis have also been incorporated.

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Capocefalo, Angela, Thomas Bizien, Simona Sennato, Neda Ghofraniha, Federico Bordi, and Francesco Brasili. "Responsivity of Fractal Nanoparticle Assemblies to Multiple Stimuli: Structural Insights on the Modulation of the Optical Properties." Nanomaterials 12, no. 9 (May 1, 2022): 1529. http://dx.doi.org/10.3390/nano12091529.

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Multi-responsive nanomaterials based on the self-limited assembly of plasmonic nanoparticles are of great interest due to their widespread employment in sensing applications. We present a thorough investigation of a hybrid nanomaterial based on the protein-mediated aggregation of gold nanoparticles at varying protein concentration, pH and temperature. By combining Small Angle X-ray Scattering with extinction spectroscopy, we are able to frame the morphological features of the formed fractal aggregates in a theoretical model based on patchy interactions. Based on this, we established the main factors that determine the assembly process and their strong correlation with the optical properties of the assemblies. Moreover, the calibration curves that we obtained for each parameter investigated based on the extinction spectra point out to the notable flexibility of this nanomaterial, enabling the selection of different working ranges with high sensitivity. Our study opens for the rational tuning of the morphology and the optical properties of plasmonic assemblies to design colorimetric sensors with improved performances.

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Lee, Eunkwang, and Hocheon Yoo. "Self-Powered Sensors: New Opportunities and Challenges from Two-Dimensional Nanomaterials." Molecules 26, no. 16 (August 20, 2021): 5056. http://dx.doi.org/10.3390/molecules26165056.

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Nanomaterials have gained considerable attention over the last decade, finding applications in emerging fields such as wearable sensors, biomedical care, and implantable electronics. However, these applications require miniaturization operating with extremely low power levels to conveniently sense various signals anytime, anywhere, and show the information in various ways. From this perspective, a crucial field is technologies that can harvest energy from the environment as sustainable, self-sufficient, self-powered sensors. Here we revisit recent advances in various self-powered sensors: optical, chemical, biological, medical, and gas. A timely overview is provided of unconventional nanomaterial sensors operated by self-sufficient energy, focusing on the energy source classification and comparisons of studies including self-powered photovoltaic, piezoelectric, triboelectric, and thermoelectric technology. Integration of these self-operating systems and new applications for neuromorphic sensors are also reviewed. Furthermore, this review discusses opportunities and challenges from self-powered nanomaterial sensors with respect to their energy harvesting principles and sensing applications.

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Ku, Chin-An, and Chen-Kuei Chung. "Advances in Humidity Nanosensors and Their Application: Review." Sensors 23, no. 4 (February 20, 2023): 2328. http://dx.doi.org/10.3390/s23042328.

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As the technology revolution and industrialization have flourished in the last few decades, the development of humidity nanosensors has become more important for the detection and control of humidity in the industry production line, food preservation, chemistry, agriculture and environmental monitoring. The new nanostructured materials and fabrication in nanosensors are linked to better sensor performance, especially for superior humidity sensing, following the intensive research into the design and synthesis of nanomaterials in the last few years. Various nanomaterials, such as ceramics, polymers, semiconductor and sulfide, carbon-based, triboelectrical nanogenerator (TENG), and MXene, have been studied for their potential ability to sense humidity with structures of nanowires, nanotubes, nanopores, and monolayers. These nanosensors have been synthesized via a wide range of processes, including solution synthesis, anodization, physical vapor deposition (PVD), or chemical vapor deposition (CVD). The sensing mechanism, process improvement and nanostructure modulation of different types of materials are mostly inexhaustible, but they are all inseparable from the goals of the effective response, high sensitivity and low response–recovery time of humidity sensors. In this review, we focus on the sensing mechanism of direct and indirect sensing, various fabrication methods, nanomaterial geometry and recent advances in humidity nanosensors. Various types of capacitive, resistive and optical humidity nanosensors are introduced, alongside illustration of the properties and nanostructures of various materials. The similarities and differences of the humidity-sensitive mechanisms of different types of materials are summarized. Applications such as IoT, and the environmental and human-body monitoring of nanosensors are the development trends for futures advancements.

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Kumar, Harsh, Kamil Kuča, Shashi Kant Bhatia, Kritika Saini, Ankur Kaushal, Rachna Verma, Tek Chand Bhalla, and Dinesh Kumar. "Applications of Nanotechnology in Sensor-Based Detection of Foodborne Pathogens." Sensors 20, no. 7 (April 1, 2020): 1966. http://dx.doi.org/10.3390/s20071966.

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The intake of microbial-contaminated food poses severe health issues due to the outbreaks of stern food-borne diseases. Therefore, there is a need for precise detection and identification of pathogenic microbes and toxins in food to prevent these concerns. Thus, understanding the concept of biosensing has enabled researchers to develop nanobiosensors with different nanomaterials and composites to improve the sensitivity as well as the specificity of pathogen detection. The application of nanomaterials has enabled researchers to use advanced technologies in biosensors for the transfer of signals to enhance their efficiency and sensitivity. Nanomaterials like carbon nanotubes, magnetic and gold, dendrimers, graphene nanomaterials and quantum dots are predominantly used for developing biosensors with improved specificity and sensitivity of detection due to their exclusive chemical, magnetic, mechanical, optical and physical properties. All nanoparticles and new composites used in biosensors need to be classified and categorized for their enhanced performance, quick detection, and unobtrusive and effective use in foodborne analysis. Hence, this review intends to summarize the different sensing methods used in foodborne pathogen detection, their design, working principle and advances in sensing systems.

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Wang, Bei, Ling Sun, Martin Schneider-Ramelow, Klaus-Dieter Lang, and Ha-Duong Ngo. "Recent Advances and Challenges of Nanomaterials-Based Hydrogen Sensors." Micromachines 12, no. 11 (November 21, 2021): 1429. http://dx.doi.org/10.3390/mi12111429.

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Safety is a crucial issue in hydrogen energy applications due to the unique properties of hydrogen. Accordingly, a suitable hydrogen sensor for leakage detection must have at least high sensitivity and selectivity, rapid response/recovery, low power consumption and stable functionality, which requires further improvements on the available hydrogen sensors. In recent years, the mature development of nanomaterials engineering technologies, which facilitate the synthesis and modification of various materials, has opened up many possibilities for improving hydrogen sensing performance. Current research of hydrogen detection sensors based on both conservational and innovative materials are introduced in this review. This work mainly focuses on three material categories, i.e., transition metals, metal oxide semiconductors, and graphene and its derivatives. Different hydrogen sensing mechanisms, such as resistive, capacitive, optical and surface acoustic wave-based sensors, are also presented, and their sensing performances and influence based on different nanostructures and material combinations are compared and discussed, respectively. This review is concluded with a brief outlook and future development trends.

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Langhammer, Christoph, Elin M. Larsson, Bengt Kasemo, and Igor Zorić. "Indirect Nanoplasmonic Sensing: Ultrasensitive Experimental Platform for Nanomaterials Science and Optical Nanocalorimetry." Nano Letters 10, no. 9 (September 8, 2010): 3529–38. http://dx.doi.org/10.1021/nl101727b.

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Gurbatov, Stanislav, Vladislav Puzikov, Evgeny Modin, Alexander Shevlyagin, Andrey Gerasimenko, Eugeny Mitsai, Sergei A. Kulinich, and Aleksandr Kuchmizhak. "Ag-Decorated Si Microspheres Produced by Laser Ablation in Liquid: All-in-One Temperature-Feedback SERS-Based Platform for Nanosensing." Materials 15, no. 22 (November 15, 2022): 8091. http://dx.doi.org/10.3390/ma15228091.

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Combination of dissimilar materials such as noble metals and common semiconductors within unified nanomaterials holds promise for optoelectronics, catalysis and optical sensing. Meanwhile, difficulty of obtaining such hybrid nanomaterials using common lithography-based techniques stimulates an active search for advanced, inexpensive, and straightforward fabrication methods. Here, we report one-pot one-step synthesis of Ag-decorated Si microspheres via nanosecond laser ablation of monocrystalline silicon in isopropanol containing AgNO3. Laser ablation of bulk silicon creates the suspension of the Si microspheres that host further preferential growth of Ag nanoclusters on their surface upon thermal-induced decomposition of AgNO3 species by subsequently incident laser pulses. The amount of the AgNO3 in the working solution controls the density, morphology, and arrangement of the Ag nanoclusters allowing them to achieve strong and uniform decoration of the Si microsphere surface. Such unique morphology makes Ag-decorated Si microspheres promising for molecular identification based on the surface-enhanced Raman scattering (SERS) effect. In particular, the designed single-particles sensing platform was shown to offer temperature-feedback modality as well as SERS signal enhancement up to 106, allowing reliable detection of the adsorbed molecules and tracing their plasmon-driven catalytic transformations. Considering the ability to control the decoration degree of Si microspheres by Ag nanoclusters via amount of the AgNO3, the developed one-pot easy-to-implement PLAL synthesis holds promise for gram-scale production of high-quality hybrid nanomaterial for various nanophotonics and sensing applications.

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Dehghan Banadaki, Arash, and Amir Kajbafvala. "Recent Advances in Facile Synthesis of Bimetallic Nanostructures: An Overview." Journal of Nanomaterials 2014 (2014): 1–28. http://dx.doi.org/10.1155/2014/985948.

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Nobel metal nanomaterials with interesting physical and chemical properties are ideal building blocks for engineering and tailoring nanoscale structures for specific technological applications. Bimetallic nanomaterials consisting of magnetic metals and noble metals have attracted much interest for their promising potentials in many fields including magnetic sensors, catalysts, optical detection, and biomedical applications. Particularly, effective control of the size, shape, architecture, and compositional microstructure of metal nanomaterials plays an important role in enhancing their functionality and application potentials, for example, in fuel cells, optical and biomedical sensing. This paper focuses on recent advances in controllable synthesis of bimetallic nanostructured materials. Recent contributions in controllable synthesis of bimetallic nanomaterials with different architectures including nanoparticles, nanowires, nanosheets, or nanotubes and their assemblies are presented in this paper. A wide range of facile synthesis methods are covered herein with high emphasis on wet chemical methods owing to their facility of use, efficacy, and smaller environmental footprint.

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Bagga, K., D. F. Brougham, T. E. Keyes, and D. Brabazon. "Magnetic and noble metal nanocomposites for separation and optical detection of biological species." Physical Chemistry Chemical Physics 17, no. 42 (2015): 27968–80. http://dx.doi.org/10.1039/c5cp01219h.

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Nanoalloys and nanocomposites are widely studied classes of nanomaterials within the context of biological systems. This article presents an overview of methods currently used for nanoalloy and nanocomposite synthesis and characterization, focusing on Au-Ag and FexOy@Au structures as primary components in detection platforms for plasmonic and magnetically enabled plasmonic bio-sensing.

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Naccache, Rafik. "(Invited) Carbon Dots – Unlocking Optical Properties for Applications in Imaging, Sensing and Energy." ECS Meeting Abstracts MA2022-02, no. 36 (October 9, 2022): 1294. http://dx.doi.org/10.1149/ma2022-02361294mtgabs.

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In recent years, nanomaterials (defined as materials < 100 nm in a single dimension) have garnered a significant interest for the development of novel applications in the physical and life sciences. One such class of nanomaterials are carbon dots, a relatively new member in the carbon allotrope family, which possesses versatile optical properties rendering it attractive for sensing, catalysis, bioimaging and drug delivery applications, to name a few. Their ultra-compact size, low cytotoxicity, resistance to photo-bleaching/blinking and tunable photoluminescence, combined with simple, environmentally-friendly and low-cost synthesis, makes them ideal candidates for study. We synthesize carbon dots via bottom-up synthesis methods, with simple organic precursors (e.g. citric acid) as the carbon source. We passivate the surface of our carbon dots to achieve high fluorescence quantum yields. Moreover, our work focuses on trying to elucidate the fluorescence mechanisms in carbon dots, which remain a subject of debate. Finally, we exploit their optical properties in order to design multifunctional materials as chiral, pH or temperature sensors, as well as heterogeneous catalysts for green energy applications.

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Lyson-Sypien, B., A. Czapla, M. Lubecka, E. Kusior, K. Zakrzewska, M. Radecka, A. Kusior, A. G. Balogh, S. Lauterbach, and H. J. Kleebe. "Gas sensing properties of TiO2–SnO2 nanomaterials." Sensors and Actuators B: Chemical 187 (October 2013): 445–54. http://dx.doi.org/10.1016/j.snb.2013.01.047.

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Chandran, Sajith Kumar. "NANOMATERIAL SENSORS FOR ENVIRONMENTAL POLLUTANTS." Journal of Advanced Scientific Research 12, no. 03 (August 31, 2021): 42–49. http://dx.doi.org/10.55218/jasr.202112306.

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Nowadays, global environment of water, soil, and atmospheric systems has continuously been deteriorating due to the incessant release of toxic chemicals from various constructed sources. The existence of heavy metal ions in the environment poses serious threats to human health and the ecosystem. Therefore, this review focuses on the advent of nanotechnology that has given immense opportunities for developing advanced nanomaterials with unique functionalities. This review reports on the development of sensing techniques based on nanomaterials including metal and metal oxide nanomaterials, quantum dots, carbon nanomaterials and polymer nanocomposites. Nanomaterials well possess excellent electrical, optical, thermal, catalytic properties and strong mechanical strength, which offer great opportunities to construct nanomaterials-based sensors or devices for environmental pollutants. The nanosorbents themselves should be nontoxic, the sorbents present relatively high sorption capacities and selectivity to the low concentration of pollutants. The adsorbed pollutants can be removed from the surface of the nanoadsorbent easily and sorbents infinitely recycled.

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Journal articles on the topic 'Nanomaterials - Optical Sensing'

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