Artykuły w czasopismach: „Semiconductor Nanomaterials (NMs)”

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Sanmartín-Matalobos, Jesús, Pilar Bermejo-Barrera, Manuel Aboal-Somoza, Matilde Fondo, Ana M. García-Deibe, Julio Corredoira-Vázquez i Yeneva Alves-Iglesias. "Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection". Nanomaterials 12, nr 14 (21.07.2022): 2501. http://dx.doi.org/10.3390/nano12142501.

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Since the discovery of Quantum Dots (QDs) by Alexey I. Ekimov in 1981, the interest of researchers in that particular type of nanomaterials (NMs) with unique optical and electrical properties has been increasing year by year. Thus, since 2009, the number of scientific articles published on this topic has not been less than a thousand a year. The increasing use of QDs due to their biomedical, pharmaceutical, biological, photovoltaics or computing applications, as well as many other high-tech uses such as for displays and solid-state lighting (SSL), has given rise to a considerable number of studies about its potential toxicity. However, there are a really low number of reported studies on the detection and quantification of QDs, and these include ICP–MS and electrochemical analysis, which are the most common quantification techniques employed for this purpose. The knowledge of chemical phenomena occurring on the surface of QDs is crucial for understanding the interactions of QDs with species dissolved in the dispersion medium, while it paves the way for a widespread use of chemosensors to facilitate its detection. Keeping in mind both human health and environmental risks of QDs as well as the scarcity of analytical techniques and methodological approaches for their detection, the adaptation of existing techniques and methods used with other NMs appears necessary. In order to provide a multidisciplinary perspective on QD detection, this review focused on three interrelated key aspects of QDs: properties, surface chemistry and detection.

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Porotnikov, Dmitry, Benjamin T. Diroll, Dulanjan Harankahage, Laura Obloy, Mingrui Yang, James Cassidy, Cole Ellison i in. "Low-threshold laser medium utilizing semiconductor nanoshell quantum dots". Nanoscale 12, nr 33 (2020): 17426–36. http://dx.doi.org/10.1039/d0nr03582c.

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Narayanan, Kannan Badri, Rakesh Bhaskar, Yong Joo Seok i Sung Soo Han. "Photocatalytic Degradation, Anticancer, and Antibacterial Studies of Lysinibacillus sphaericus Biosynthesized Hybrid Metal/Semiconductor Nanocomposites". Microorganisms 11, nr 7 (14.07.2023): 1810. http://dx.doi.org/10.3390/microorganisms11071810.

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The biological synthesis of nanocomposites has become cost-effective and environmentally friendly and can achieve sustainability with high efficiency. Recently, the biological synthesis of semiconductor and metal-doped semiconductor nanocomposites with enhanced photocatalytic degradation efficiency, anticancer, and antibacterial properties has attracted considerable attention. To this end, for the first time, we biosynthesized zinc oxide (ZnO) and silver/ZnO nanocomposites (Ag/ZnO NCs) as semiconductor and metal-doped semiconductor nanocomposites, respectively, using the cell-free filtrate (CFF) of the bacterium Lysinibacillus sphaericus. The biosynthesized ZnO and Ag/ZnO NCs were characterized by various techniques, such as ultraviolet-visible spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and photoluminescence spectroscopy. The photocatalytic degradation potential of these semiconductor NPs and metal-semiconductor NCs was evaluated against thiazine dye, methylene blue (MB) degradation, under simulated solar irradiation. Ag/ZnO showed 90.4 ± 0.46% photocatalytic degradation of MB, compared to 38.18 ± 0.15% by ZnO in 120 min. The cytotoxicity of ZnO and Ag/ZnO on human cervical HeLa cancer cells was determined using an MTT assay. Both nanomaterials exhibited cytotoxicity in a concentration- and time-dependent manner on HeLa cells. The antibacterial activity was also determined against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus). Compared to ZnO, Ag/ZnO NCs showed higher antibacterial activity. Hence, the biosynthesis of semiconductor nanoparticles could be a promising strategy for developing hybrid metal/semiconductor nanomaterials for different biomedical and environmental applications.

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Lemeshko, P. S., Yu M. Spivak i V. A. Moshnikov. "Possibilities of Multiphoton Microscopy in Semiconductor Nanomaterials Research". Nano- i Mikrosistemnaya Tehnika 24, nr 6 (19.12.2022): 271–78. http://dx.doi.org/10.17587/nmst.24.271-278.

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Multiphoton microscopy is the method using nonlinear optical effect which is two-photon absorption. It occurs when two identical photons are absorbed simultaneously. The photon energy should be around two times smaller than the photon energy for one-photon absorption. Thus, the excitation irradiation wavelength for multiphoton microscopy should be twice that for conventional confocal microscopy. Nowadays, multiphoton microscopy is widely used for biological research, but it is possible to apply this for non-biological materials studying, particularly, for solid-state materials and structures. Low-wavelength laser irradiation deep penetration, focusing and optical signal analysis possibility provides essential new challenges solving of hierarchical "smart" nanoparticles synthesis for target drug delivery, theranostics etc. In this paper we give an answer of some most popular questions about multiphoton microscopy. Nature and aspects of the multiphoton microscopy method were described. Advantages of this method in comparison with confocal microscopy method were shown. Multiphoton microscopy gives the best image contrast and the less photodamage and photobleaching of biological samples, and provides an opportunity of three-dimensional imaging of the biomaterials as well as the solid-state materials. Additionally, capabilities of this method for solid-state materials research were demonstrated by the porous silicon samples example. Also, multiphoton microscopy images of biological objects were shown.

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Tsvetkov, L. A., A. A. Pustovalov, G. A. Badun, V. A. Bunyaev, V. N. Verbetsky, A. A. Mandrugin i N. N. Baranov. "Ways of Increasing Specific Energy Intensity of Tritium-based beta-Voltaic Nuclear Batteries". Nano- i Mikrosistemnaya Tehnika 23, nr 5 (22.10.2021): 223–31. http://dx.doi.org/10.17587/nmst.23.223-231.

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Creating a beta-voltaic semiconductor battery based on long-lived radionuclide is an urgent task. However, today the technology of creating such energy sources and their output characteristics are far from perfect. This article analyzes ways to maximize energy intensity on the surface of the semiconductor carrier. Various methods of creating the maximum possible volume concentration of radioactive beta-emitter atoms based on the use of tritium are considered. A variety of variants using "associated" tritium are considered for application on the surface of the semiconductor carrier: metal tritids, intermetalides. One option may be the use of tritium-labeled organic molecules and polymers, as well as tritium, which is part of carbon nanomaterials — fullerenes, nanotubes, nanodiamonds, graphene and graphene oxide. The properties of intermet-allides hydrides (LaNi5, LaNi5T6) are considered. The dependence of the unit energy intensity of the battery's working body on the thickness of the emitter's film has been analyzed. As a result of the studies, the analysis of ways to achieve maximum energy intensity on the surface of the semiconductor carrier was analyzed. Various methods of creating the maximum possible volume concentration of radioactive beta-emitter atoms based on the use of tritium are considered. The dependence of the unit energy intensity of the battery's working body on the thickness of the emitter's film has been analyzed.

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Elshafaie, A., Laila H. Abdel-Rahman, Ahmed M. Abu-Dief, Samar Kamel Hamdan, A. M. Ahmed i E. M. M. Ibrahim. "Electric, Thermoelectric and Magnetic Properties of Nickel(II) Imine Nanocomplexes". Nano 13, nr 07 (lipiec 2018): 1850074. http://dx.doi.org/10.1142/s1793292018500741.

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Production of novel organic semiconductor nanomaterials is essential for enabling the development of personal, portable and flexible electronic modules. This work presents Ni(II)-Schiff base complexes with enhanced Seebeck coefficient and weak ferromagnetic ordering for thermoelectric and magnetic devices. Four Ni(II)-Schiff base complexes (namely [Ni(C[Formula: see text]H[Formula: see text]N3O4Br)][Formula: see text]2H2O, [Ni(C[Formula: see text]H[Formula: see text]N3O[Formula: see text]][Formula: see text]2H2O, [Ni(C[Formula: see text]H[Formula: see text]N5O8Br)] and [Ni(C[Formula: see text]H[Formula: see text]N5O[Formula: see text]][Formula: see text]H2O) have been synthesized in nanosized dimensions. The electrical and thermoelectric properties have been studied, and comprehensive discussions have been presented to understand the electrical conduction mechanisms. The electrical conductivity measurements reveal that the conduction is due to the charge carriers hoping between the atomic sites of the same energy levels in the molecule as well as the transfer of the charge carriers between the neighboring complex molecules due to overlapping of their orbitals. The thermoelectric measurement confirms that the nanocomplexes (NCs) are non-degenerate P-type semiconductors with enhanced Seebeck coefficient values compared with those reported for other organic materials. The NCs exhibit antiferromagnetic to paramagnetic transitions with the increase of temperature and weak ferromagnetic ordering at 300[Formula: see text]K.

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Mao, Qiulian, Jicun Ma, Mei Chen, Shiying Lin, Noman Razzaq i Jiabin Cui. "Recent advances in heavily doped plasmonic copper chalcogenides: from synthesis to biological application". Chemical Synthesis 3, nr 3 (2023): 26. http://dx.doi.org/10.20517/cs.2022.41.

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Copper-based chalcogenide compounds have emerged as alternative materials to Cd- or Pb-based traditional semiconductors and have drawn significant attention. Compared with widely reported semiconductors, copper chalcogenide nanocrystals (NCs) with abundant copper defects and vacancies present p-type features. Additionally, the migration of free hole carriers in copper-based chalcogenide NCs produced a metal-like local surface plasmon resonance (LSPR) effect. In this review, we focused on the plasmonic copper chalcogenide NCs achieved through a heavily doped strategy. The copper sulfur compounds with versatile atomic ratios and complex crystal structures exhibit rich electrical, optical, and magnetic properties, making them highly promising for a broad range of applications, from energy conversion to biomedical fields. Therefore, our main focus is on the classification of copper chalcogenide synthesis strategies, theoretical studies of doping, doping strategies, and biological applications. We aim to analyze the trends of copper-based chalcogenide nanomaterials for clinical applications by summarizing previous studies and presenting designs and concepts in a brief manner.

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González-Rubio, Guillermo, i Wiebke Albrecht. "Engineering of plasmonic gold nanocrystals through pulsed laser irradiation". Applied Physics Letters 121, nr 20 (14.11.2022): 200502. http://dx.doi.org/10.1063/5.0122888.

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Gold nanocrystals (NCs) have drawn tremendous interest in the scientific community due to their unique ability to interact with light. When irradiated with ultrafast pulsed lasers, the lattice temperature of gold NCs can rapidly increase, even above the melting and evaporation thresholds, which results in strong morphological, structural, and aggregation state modifications. Thereby, ultrafast pulsed laser irradiation can lead to the formation of metastable gold nanostructures with distinctive physicochemical features. In this Perspective, we discuss the implementation of femtosecond and nanosecond pulsed lasers to engineer gold NCs. We underline the importance of controlling the heating and cooling dynamics to achieve desired reshaping and restructuring of gold NCs at temperatures below and above its melting point. In addition, we demonstrate the need for advanced electron microscopy characterization techniques and single-particle studies to understand the detailed atomistic mechanisms behind the modifications following pulsed laser irradiation. Finally, we provide our views of the evolving opportunities of ultrafast laser irradiation as a unique tool for the fabrication of unprecedented nanomaterials and catalysts from metal and multimetal NCs to semiconductors.

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Zhang, Zhijie, Rui Zhou, Deben Li, Ying Jiang, Xuesheng Wang, Huiling Tang i Jiayue Xu. "Recent Progress in Halide Perovskite Nanocrystals for Photocatalytic Hydrogen Evolution". Nanomaterials 13, nr 1 (25.12.2022): 106. http://dx.doi.org/10.3390/nano13010106.

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Due to its environmental cleanliness and high energy density, hydrogen has been deemed as a promising alternative to traditional fossil fuels. Photocatalytic water-splitting using semiconductor materials is a good prospect for hydrogen production in terms of renewable solar energy utilization. In recent years, halide perovskite nanocrystals (NCs) are emerging as a new class of fascinating nanomaterial for light harvesting and photocatalytic applications. This is due to their appealing optoelectronic properties, such as optimal band gaps, high absorption coefficient, high carrier mobility, long carrier diffusion length, etc. In this review, recent progress in halide perovskite NCs for photocatalytic hydrogen evolution is summarized. Emphasis is given to the current strategies that enhance the photocatalytic hydrogen production performance of halide perovskite NCs. Some scientific challenges and perspectives for halide perovskite photocatalysts are also proposed and discussed. It is anticipated that this review will provide valuable references for the future development of halide perovskite-based photocatalysts used in highly efficient hydrogen evolution.

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Chew, Xiong Yeu, Guang Ya Zhou i Fook Siong Chau. "Novel Doubly Nano-Scale Perturbative Resonance Control of a Free-Suspending Photonic Crystal Structure". Applied Mechanics and Materials 83 (lipiec 2011): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amm.83.147.

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The impact of developing nanophotonic components have proven to be a promising research on the future optical integrated circuit complementing the current scaling of semiconductors for faster board-board, chip-chip interconnect speeds. Essentially photonic crystals (PhC) symbolize an emerging class of periodic nanomaterials that offers flexibilities in achieving novel devices. Based on the investigations of the high-Q resonance mode energy distributions, we optimized the nanoscale tip for optimal perturbative effect with low loss resonance control in the optical near field regime. In this study to achieve larger spectral resonance, we proposed using a novel doubly nanoscale perturbative tip to achieve optimal accurate photonic crystal resonance control. Such method may be driven by a nano-electromechanical (NEMS) system that may be fabricated with monolithic approaches.

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Emara, Mahmoud Mohamed, Shaimaa Khamis Ahmed i Ali El-Dissouky. "Domestic microwave assisted one-step co-precipitation of Ag–CuO nanocomposite of Cu/Ag ratio optimized for photocatalysis and comparison with blending CuO with Ag nanoparticles". Canadian Journal of Chemistry 99, nr 4 (kwiecień 2021): 403–10. http://dx.doi.org/10.1139/cjc-2020-0373.

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The Ag–CuO metal–semiconductor nanocomposite (NC) is an important component in various nanomaterial-based applications. Several approaches have been studied to facilitate its synthesis. However, most of them encounter some drawbacks. In the present work, we show the synthesis of Ag–CuO NCs through one-pot co-precipitation with the aid of simple starting chemicals and measures including metal nitrates, hexamine, agar, and domestic microwave heating. Photocatalyzed degradation of Congo Red in addition to the structural and optical characteristics show that this method is successful in production of the Schottky barrier in Ag–CuO NCs with improved photocatalytic activity (PCA). Changing the Cu content shows that the NC is not successfully formed at low Cu mol%. Consequently, the PCA of Ag–CuO of low Cu (2%–6%) lies within 4.5 × 10−4 – 5.1 × 10−4 min−1, which is even lower than those of plain Ag and CuO nanoparticles (6.0 × 10−4 – 8.1 × 10−4 min−1, respectively). 60 mol% was the optimum Cu content with the highest PCA (18.8 × 10−4 min−1). Blending plain Ag and CuO nanoparticles to mimic the co-precipitated 60 mol% Ag–CuO showed very low PCA, even lower than the plain Ag and CuO, which once again confirms the efficiency of the simple one-pot co-precipitation approach in producing Ag–CuO with the Schottky barrier and promoted PCA.

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Gaumet, Jean-Jacques, i Geoffrey Strouse. "Mass Spectrometry Analysis of Organic-Inorganic Nanomaterials and their Precursors". MRS Proceedings 726 (2002). http://dx.doi.org/10.1557/proc-726-q10.6.

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AbstractWe report in this paper how electrospray mass spectrometry (ESMS) and nanospray mass spectrometry (NMS) are promising for analyzing precursors and nano-scale semiconductor (IIVI) materials up to 1.5 nm and mixed valence clusters (Co/Cd). We show that both ion modes in ESMS and NMS provide insight concerning the structure analysis, the composition and the stability of these materials.

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Moetasam Zorab, Musa, Navid Mohammadjani, Morahem Ashengroph i Mehran Alavi. "Biosynthesis of Quantum Dots and Their Therapeutic Applications in the Diagnosis and Treatment of Cancer and SARS-CoV-2". Advanced Pharmaceutical Bulletin, 6.12.2022. http://dx.doi.org/10.34172/apb.2023.065.

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Quantum dots (QDs) are semiconductor materials that range from 2 to 10 nanometers. These nanomaterials (NMs) are smaller and have more unique properties compared to conventional nanoparticles (NPs). One of the unique properties of QDs is their special optoelectronic properties, making it possible to apply these NMs in bioimaging. Different size and shape QDs, which are used in various fields such as bioimaging, biosensing, cancer therapy, and drug delivery, have so far been produced by chemical methods. However, chemical synthesis provides expensive routes and causes serious environmental and health issues. Therefore, various biological systems such as bacteria, fungi, yeasts, algae, and plants are considered as potent eco-friendly green nanofactories for the biosynthesis of QDs, which are both economic and environmentally safe. The review aims to provide a descriptive overview of the various microbial agents for the synthesis of QDs and their biomedical applications for the diagnosis and treatment of cancer and SARS-CoV-2.

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Ni, JunJie, Lu Yang i TianYun Wang. "Effect of transition metal doping on the photoelectric structure of single layer NbS₂ under defects". Modern Physics Letters B, 31.08.2023. http://dx.doi.org/10.1142/s0217984923502226.

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Excellent semiconductors and novel optical properties are the first criteria for nanomaterial technology. In this paper, the S-atom defect is applied to 1T-NbS2 for the first time, and doping atoms are introduced. The concentration of doping atoms is 3.84% and 4% under the two types of defects. Finally, the metallic properties of NbS2 were weakened successfully, and the highest indirect band gap of 0.27[Formula: see text]eV was induced, which gradually transformed into a brand-new semiconductor material. In addition, partially composite systems exhibit excellent electromagnetic storage, polarizability, and infrared light absorption, showing high reflectivity in the visible and low-frequency UV regions, which can be used to make blackout lenses and reflective coatings. Cd composite systems can be used as a new type of conducting semiconductor for all kinds of equipment.

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Alo, Arthur, Jonathan C. Lemus, Claudevan A. Sousa, Gabriel Nagamine i Lázaro Padilha. "Two-photon absorption in colloidal semiconductor nanocrystals: a review". Journal of Physics: Condensed Matter, 29.08.2023. http://dx.doi.org/10.1088/1361-648x/acf4dc.

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Abstract Large two-photon absorption (2PA) cross-section combined with high emission quantum efficiency and size-tunable bandgap energy has put colloidal semiconductor nanocrystals (NCs) on the vanguard of nonlinear optical materials. After nearly two decades of intense studies on the nonlinear optical response in quantum-confined semiconductors, this is still a vibrant field, as novel nanomaterials are being developed and new applications are being proposed. In this review, we examine the progress of 2PA research in NCs, highlighting the impact of quantum confinement on the magnitude and spectral characteristics of this nonlinear response in semiconductor materials. We show that for NCs with three-dimensional quantum confinement, the so-called quantum dots (QDs), 2PA cross-section grows linearly with the nanoparticle volume, following a universal volume scaling. We overview strategies used to gain further control over the nonlinear optical response in these structures, by shape and heterostructure engineering, and some applications that might take advantage of the series of unique properties of these nanostructures.

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Chen, Qimiao, Shaoteng Wu, Lin Zhang, Hao Zhou, Weijun Fan i Chuan Seng Tan. "Transferable single-layer GeSn nanomembrane resonant-cavity-enhanced photodetectors for 2 μm band optical communication and multi-spectral short-wave infrared sensing". Nanoscale, 2022. http://dx.doi.org/10.1039/d1nr07293e.

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Semiconductor nanomembranes (NMs) have emerged as an attractive nanomaterial for advanced electronic and photonic devices with attractive features such as transferability and flexibility, enabling heterogeneous integration of multi-functional components. Here,...

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Jiaming, Chen, Li Dongke, Sun Teng, Junnan Han, Yangyi Zhang, Wei Li, Jun Xu i Kunji Chen. "Experimental observations on metal-like carrier transport and Mott hopping conduction behaviours in boron-doped Si nanocrystal multilayers". Nanotechnology, 26.01.2023. http://dx.doi.org/10.1088/1361-6528/acb652.

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Abstract Studies on the carrier transport characteristics of semiconductor nanomaterials are the important and interesting issues which are helpful for developing the next generation of optoelectronic devices. In this work, we fabricate B-doped Si nanocrystals/SiO2 multilayers by plasma enhanced chemical vapor deposition with subsequent high temperature annealing. The electronic transport behaviors are studied via Hall measurements within wide temperature range (30-660 K). It is found that when the temperature is above 300 K, all the B-doped Si nanocrystals with the size of 4.0 nm exhibit the semiconductor-like conduction characteristics, while the conduction of Si nanocrystals with large size of 7.0 nm transforms from semiconductor-like to metal-like at high B-doping ratios. The critical carrier concentration of conduction transition can reach as high as 2.2×1020 cm-3, which is significantly higher than that of bulk counterpart and may be even higher for the smaller Si nanocrystals. Meanwhile, the Mott variable-range hopping dominates the carrier transport when the temperature is below 100 K. The localization radius of carriers can be regulated by the B-doping ratios and Si NCs size, which is contributed to the metallic insulator transition.

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Khammang, Alex, Joshua T. Wright i Robert W. Meulenberg. "Mechanistic insight into copper cation exchange in cadmium selenide semiconductor nanocrystals using X-ray absorption spectroscopy". Nature Communications 12, nr 1 (19.01.2021). http://dx.doi.org/10.1038/s41467-020-20712-0.

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AbstractIn terms of producing new advances in sustainable nanomaterials, cation exchange (CE) of post-processed colloidal nanocrystals (NCs) has opened new avenues towards producing non-toxic energy materials via simple chemical techniques. The main processes governing CE can be explained by considering hard/soft acid/base theory, but the detailed mechanism of CE, however, has been debated and has been attributed to both diffusion and vacancy processes. In this work, we have performed in situ x-ray absorption spectroscopy to further understand the mechanism of the CE of copper in solution phase CdSe NCs. The x-ray data indicates clear isosbestic points, suggestive of cooperative behavior as previously observed via optical spectroscopy. Examination of the extended x-ray absorption fine structure data points to the observation of interstitial impurities during the initial stages of CE, suggesting the diffusion process is the fundamental mechanism of CE in this system.

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Umekar, Mayuri S., Ganesh S. Bhusari, Toshali Bhoyar, Vidyasagar Devthade, Bharat P. Kapgate, Ajay P.Potbhare, Ratiram G. Chaudhary i Ahmed A. Abdala. "Graphitic Carbon Nitride-Based Photocatalyst for Environmental Remediation of Organic Pollutants". Current Nanoscience 18 (27.01.2022). http://dx.doi.org/10.2174/1573413718666220127123935.

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Abstract: Graphitic carbon nitride (g-C3N4) is an extraordinary semiconductor photocatalyst (PC) to transform solar energy into chemical energy for the photodisintegration of several noxious organic contaminants into non-toxic derivatives. Polymeric g-C3N4 is a metal-free PC with high chemical stability, eco-friendly composition, and suitable energy band potential that absorb a significant portion of the solar spectrum. Despite its outstanding characteristics, g-C3N4 has some limitations, including low visible light absorption, low surface area, and rapid recoupling of charge carriers. These limitations over-shaded its proficient efficiency as a PC. The current g-C3N4 related research focuses on developing g-C3N4 nanocomposites (NCs) with high-surface-area, broad light-absorbing, and reduced recombination via physicochemical modifications. This review highlights the latest developments in the synthesis and application of pristine g-C3N4 and its NCs with inorganics and nanomaterials. A critical analysis of the strategies to enhance g-C3N4 photocatalytic efficiency via excited charge separation and visible light absorption is also presented. Furthermore, the photocatalytic degradation of organic pollutants (OPs), including dyes, phenol, antibiotics, and pharmaceutical drugs, is summarized herewith.

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Ryabova, Anastasia V., Daria V. Pominova, Victoria A. Krut’ko, Maria G. Komova i Victor B. Loschenov. "Spectroscopic research of upconversion nanomaterials based on complex oxide compounds doped with rare-earth ion pairs: Benefit for cancer diagnostics by upconversion fluorescence and radio sensitive methods/Spektroskopische Untersuchung von mit Ionenpaaren Seltener Erden dotierten Upconversion-Nanokompositen: Nutzen für die Krebsdiagnostik durch Upconversion-Fluoreszenz und strahlungssensitive Methoden". Photonics & Lasers in Medicine 2, nr 2 (1.01.2013). http://dx.doi.org/10.1515/plm-2013-0013.

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AbstractHighly photochemically stable nanoparticles, in which upconversion luminescence can be excited – so-called upconversion nanocrystals (UC-NCs) – exhibit widely separated (up to 500 nm) narrow luminescence bands in the visible (VIS) region located far from the excitation near-infrared (NIR) laser radiation, and thus can be more easily identified compared to organic luminophores and semiconductor nanoparticles. Due to a deep penetration of exciting infrared (IR) radiation, the absence of parasitic fluorescence of biomolecules and the absence of phototoxicity and photobleaching upon near IR excitation, UC-NCs can be efficiently used as fluorescent probes in biological studies and fluorescence diagnostics (FD). The doping of such nanoparticles with GdWe studied the upconversion characteristics of inorganic nanoparticles made of different materials doped with rare-earth ion (REI) pairs YbBased on the results obtained, the matrix LaThe investigated complex polycrystalline oxide compounds are promising as diagnostic agents for biological tissues visualization by fluorescence, light scattering, and nuclear magnetic resonance imaging.

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Kadim, Akeel M. "Fabrication of nano battery from CdS quantum dots and organic polymer". Kuwait Journal of Science 49, nr 1 (2.12.2021). http://dx.doi.org/10.48129/kjs.v49i1.11757.

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Efficient energy storage systems are recharged from the nano batteries; however, the available energy of present nanomaterial batteries remains capable for many applications due to the limited basic charging capacity of the electrode materials. A cadmium sulfide (CdS) nanocrystal (NCs) or quantum dots (QDs) that was prepared by chemical reaction and were fabricated nano battery device using the PVV / Li: graphite / CdS / Al. The optical properties of the CdS QDs were described by the spectrometers of ultraviolet-visible (UV-Vis.) and photoluminescence (PL), the results are indicating that the CdS QDs prepared where nanocrystalline structures are formed. The energy gap (Eg) of CdS QDs measured from PL was found to be about 2.69 eV. The CdS QDs led to improving the performs of the nano battery in terms of enhancing the mobility of the carrier's charging and consequently the processes of recombination between CdS QDs and Li-ions. The characteristics of the current-voltage (I-V) indicate acceptable conditions for the generation of light at (3 Volt). The structures can be designed to determine the fundamentals of ion and electron transport for energy storage in nanostructures and to test the limits of three-dimensional nano battery technologies. The nano battery device from semiconductor substance (CdS QDs) with (Li) has been successful in operating the nano battery with a few voltages giving a good current. Fabrication of CdS QDs and Li nano battery devices was involved in enhancing the efficiency of the nano battery devices.

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Artykuły w czasopismach na temat „Semiconductor Nanomaterials (NMs)”

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