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Artículos de revistas sobre el tema "Shell nanoparticles for hydrogen sensing application"

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Autor: Grafiati

Publicado: 6 de septiembre de 2023

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1

Wang, Junjie, Xiaoping Yue, Yulong Zhang, Chengcheng Zhu, Xing Kang, Hai-Dong Yu y Gang Lu. "Plasmonic Sensing of Glucose Based on Gold–Silver Core–Shell Nanoparticles". Chemosensors 10, n.º 10 (8 de octubre de 2022): 404. http://dx.doi.org/10.3390/chemosensors10100404.

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Developing a simple and convenient approach for glucose sensing is crucially important in disease diagnosis and health monitoring. In this work, a glucose sensor based on plasmonic nanostructures was developed using gold–silver core–shell nanoparticles as the sensing platform. Based on the oxidative etching of the silver shell, the concentration of hydrogen peroxide and glucose could be determined quantitatively via the spectral change. This spectral change could also be observed with the naked eye or with a phone camera, realizing colorimetric sensing. To demonstrate this, glucose solutions at different concentrations were quantitatively detected in a wide concentration range of 0–1.0 mM using this colorimetric sensor. Importantly, shell thickness could significantly affect the sensitivity of our colorimetric sensor. This work provides a deeper understanding of the plasmonic sensing of glucose, which will help to realize its real applications. Based on this strategy, the non-invasive sensing of metabolites may be realized for disease diagnosis and health monitoring.

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2

Zhang, Mingying, Qinglin Sheng, Fei Nie y Jianbin Zheng. "Synthesis of Cu nanoparticles-loaded Fe3O4@carbon core–shell nanocomposite and its application for electrochemical sensing of hydrogen peroxide". Journal of Electroanalytical Chemistry 730 (septiembre de 2014): 10–15. http://dx.doi.org/10.1016/j.jelechem.2014.07.020.

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3

Efimov, Alexey A., Denis V. Kornyushin, Arseny I. Buchnev, Ekaterina I. Kameneva, Anna A. Lizunova, Pavel V. Arsenov, Andrey E. Varfolomeev, Nikita B. Pavzderin, Alexey V. Nikonov y Victor V. Ivanov. "Fabrication of Conductive and Gas-Sensing Microstructures Using Focused Deposition of Copper Nanoparticles Synthesized by Spark Discharge". Applied Sciences 11, n.º 13 (22 de junio de 2021): 5791. http://dx.doi.org/10.3390/app11135791.

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Solvent-free aerosol jet printing has been investigated for fabricating metallic and semiconductor (gas-sensitive) microstructures based on copper nanoparticles on alumina, borosilicate glass, and silicon substrates. The synthesis of nanoparticles was carried out using a spark discharge directly in the printing process without the stage of preparing nano-ink. Printed lines with a width of 100–150 µm and a height of 5–7 µm were formed from submicron agglomerates consisting of primary nanoparticles 10.8 ± 4.9 nm in size with an amorphous oxide shell. The electrical resistivity, surface morphology, and shrinkage of printed lines were investigated depending on the reduction sintering temperature. Sintering of copper oxides of nanoparticles began at a temperature of 450 °C in a hydrogen atmosphere with shrinkage at the level of 45–60%. Moreover, aerosol heat treatment was used to obtain highly conductive lines by increasing the packing density of deposited nanoparticles, providing in-situ transformation of submicron agglomerates into spherical nanoparticles with a size of 20–50 nm. Copper lines of spherical nanoparticles demonstrated excellent resistivity at 5 μΩ·cm, about three times higher than that of bulk copper. In turn, semiconductor microstructures based on unsintered agglomerates of oxidized copper have a fairly high sensitivity to NH3 and CO. Values of response of the sensor based on non-sintered oxidized copper nanoparticles to ammonia and carbon monoxide concentration of 40 ppm were about 20% and 80%, respectively.

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4

Hong, Zih-Siou, Chun-Han Wu y Ren-Jang Wu. "Application of Pt@SnO2 nanoparticles for hydrogen gas sensing". Journal of the Chinese Chemical Society 65, n.º 7 (17 de mayo de 2018): 861–67. http://dx.doi.org/10.1002/jccs.201700385.

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5

Khlebtsov, Boris N., Andrey M. Burov, Andrey M. Zakharevich y Nikolai G. Khlebtsov. "SERS and Indicator Paper Sensing of Hydrogen Peroxide Using Au@Ag Nanorods". Sensors 22, n.º 9 (21 de abril de 2022): 3202. http://dx.doi.org/10.3390/s22093202.

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The detection of hydrogen peroxide and the control of its concentration are important tasks in the biological and chemical sciences. In this paper, we developed a simple and quantitative method for the non-enzymatic detection of H2O2 based on the selective etching of Au@Ag nanorods with embedded Raman active molecules. The transfer of electrons between silver atoms and hydrogen peroxide enhances the oxidation reaction, and the Ag shell around the Au nanorod gradually dissolves. This leads to a change in the color of the nanoparticle colloid, a shift in LSPR, and a decrease in the SERS response from molecules embedded between the Au core and Ag shell. In our study, we compared the sensitivity of these readouts for nanoparticles with different Ag shell morphology. We found that triangle core–shell nanoparticles exhibited the highest sensitivity, with a detection limit of 10−4 M, and the SERS detection range of 1 × 10−4 to 2 × 10−2 M. In addition, a colorimetric strategy was applied to fabricate a simple indicator paper sensor for fast detection of hydrogen peroxide in liquids. In this case, the concentration of hydrogen peroxide was qualitatively determined by the change in the color of the nanoparticles deposited on the nitrocellulose membrane.

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6

Li, Yongxin, Qiufang Lu, Shengnan Wu, Lun Wang y Xianming Shi. "Hydrogen peroxide sensing using ultrathin platinum-coated gold nanoparticles with core@shell structure". Biosensors and Bioelectronics 41 (marzo de 2013): 576–81. http://dx.doi.org/10.1016/j.bios.2012.09.027.

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7

Jiang, Guicheng, Shaoshuai Zhou, Xiantao Wei, Yonghu Chen, Changkui Duan, Min Yin, Bin Yang y Wenwu Cao. "794 nm excited core–shell upconversion nanoparticles for optical temperature sensing". RSC Advances 6, n.º 14 (2016): 11795–801. http://dx.doi.org/10.1039/c5ra27203c.

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8

Trujillo, Ricardo Matias, Daniela Estefanía Barraza, Martin Lucas Zamora, Anna Cattani-Scholz y Rossana Elena Madrid. "Nanostructures in Hydrogen Peroxide Sensing". Sensors 21, n.º 6 (21 de marzo de 2021): 2204. http://dx.doi.org/10.3390/s21062204.

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In recent years, several devices have been developed for the direct measurement of hydrogen peroxide (H2O2), a key compound in biological processes and an important chemical reagent in industrial applications. Classical enzymatic biosensors for H2O2 have been recently outclassed by electrochemical sensors that take advantage of material properties in the nano range. Electrodes with metal nanoparticles (NPs) such as Pt, Au, Pd and Ag have been widely used, often in combination with organic and inorganic molecules to improve the sensing capabilities. In this review, we present an overview of nanomaterials, molecules, polymers, and transduction methods used in the optimization of electrochemical sensors for H2O2 sensing. The different devices are compared on the basis of the sensitivity values, the limit of detection (LOD) and the linear range of application reported in the literature. The review aims to provide an overview of the advantages associated with different nanostructures to assess which one best suits a target application.

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9

Tsai, Yu-Sheng, Deng-Yi Wang, Jia-Jie Chang, Keng-Tien Liang, Ya-Hsuan Lin, Chih-Chen Kuo, Ssu-Han Lu et al. "Incorporation of Au Nanoparticles on ZnO/ZnS Core Shell Nanostructures for UV Light/Hydrogen Gas Dual Sensing Enhancement". Membranes 11, n.º 11 (22 de noviembre de 2021): 903. http://dx.doi.org/10.3390/membranes11110903.

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ZnO/ZnS nanocomposite-based nanostructures exhibit dual light and gas sensing capabilities. To further boost the light/dual sensing properties, gold nanoparticles (Au NPs) were incorporated into the core-shell structures. Multiple material characterizations revealed that Au NPs were successfully well spread and decorated on ZnO/ZnS nanostructures. Furthermore, our findings show that the addition of Au NPs could enhance both 365 nm UV light sensing and hydrogen gas sensing in terms of light/gas sensitivity and light/gas response time. We postulate that the optimization of gas/light dual sensing capability may result from the induced electric field and inhabitation of electron-hole recombination. Owing to their compact size, simple fabrication, and stable response, ZnO/ZnS/Au NPs-based light/gas dual sensors are promising for future extreme environmental monitoring.

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10

Han, Geun-Ho, Ki Yoon Kim, Hyunji Nam, Hyeonjin Kim, Jihwan Yoon, Jung-Hyun Lee, Hong-Kyu Kim et al. "Facile Direct Seed-Mediated Growth of AuPt Bimetallic Shell on the Surface of Pd Nanocubes and Application for Direct H2O2 Synthesis". Catalysts 10, n.º 6 (10 de junio de 2020): 650. http://dx.doi.org/10.3390/catal10060650.

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The selective enhancement of catalytic activity is a challenging task, as catalyst modification is generally accompanied by both desirable and undesirable properties. For example, in the case of the direct synthesis of hydrogen peroxide, Pt on Pd improves hydrogen conversion, but lowers hydrogen peroxide selectivity, whereas Au on Pd enhances hydrogen peroxide selectivity but decreases hydrogen conversion. Toward an ideal catalytic property, the development of a catalyst that is capable of improving H-H dissociation for increasing H2 conversion, whilst suppressing O-O dissociation for high H2O2 selectivity would be highly beneficial. Pd-core AuPt-bimetallic shell nanoparticles with a nano-sized bimetallic layer composed of Au-rich or Pt-rich content with Pd cubes were readily prepared via the direct seed-mediated growth method. In the Pd-core AuPt-bimetallic shell nanoparticles, Au was predominantly located on the {100} facets of the Pd nanocubes, whereas Pt was deposited on the corners of the Pd nanocubes. The evaluation of Pd-core AuPt-bimetallic shell nanoparticles with varying Au and Pt contents revealed that Pd-core AuPt-bimetallic shell that was composed of 2.5 mol% Au and 5 mol% Pt, in relation to Pd, exhibited the highest H2O2 production rate (914 mmol H2O2 gmetal−1 h−1), due to the improvement of both H2O2 selectivity and H2 conversion.

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11

Wy, Younghyun, Seunghoon Lee, Dae Han Wi y Sang Woo Han. "Colloidal Clusters of Bimetallic Core-Shell Nanoparticles for Enhanced Sensing of Hydrogen in Aqueous Solution". Particle & Particle Systems Characterization 35, n.º 5 (19 de enero de 2018): 1700380. http://dx.doi.org/10.1002/ppsc.201700380.

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12

Martinho, José M. G., Telmo J. V. Prazeres, Leila Moura y José P. S. Farinha. "Fluorescence of oligonucleotides adsorbed onto the thermoresponsive poly(isopropyl acrylamide) shell of polymer nanoparticles: Application to bioassays". Pure and Applied Chemistry 81, n.º 9 (26 de agosto de 2009): 1615–34. http://dx.doi.org/10.1351/pac-con-08-11-11.

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The fluorescence of a rhodamine X dye covalently linked to the 5' terminus of a 25-mers thymine oligodeoxynucleotide (dT25-ROX), adsorbed on the shell of thermoresponsive core-shell polymer particles, was used to probe the polarity, mobility, and distribution of the oligodeoxynucleotides (ODNs) in the shell. The particles have a glassy core of poly(methyl methacrylate) (PMMA) with a 67-nm radius, and a thermoresponsive shell of poly(N-isopropyl acrylamide) (PNIPAM) whose thickness changes from 42 nm at 11 ºC to 5 nm at 45 ºC. The variation in polarity of the shell with temperature was obtained both from the lifetimes and from the solvatochromic shifts of the dye and shows a sharp transition at the volume phase transition temperature (TVPT) of the PNIPAM shell. Förster resonance energy transfer (FRET) between dT25-ROX and a malachite green (MG)-labeled ODN (dT25-MG) was used to obtain the distribution of the ODNs in the thermoresponsive shell. Our results show that at 23 ºC (below TVPT) the ODNs are distributed inside the shell, sensing an environment similar to water. At this temperature, the PNIPAM shell is composed of hydrated chains with high mobility, as probed by the fluorescence anisotropy of dT25-ROX. By increasing the temperature above TVPT, the shell collapses and the chain mobility drastically slows down owing to the anchoring of the ODN to the dense shell of PNIPAM. Furthermore, FRET shows that the ODNs are absorbed on the 5-nm-thick collapsed shell but extend into the water. The polarity probed by the ROX averages the dyes distributed in the interior of the particle shell and in water, with 60 % of the dyes outside the particle shell (i.e., sensing pure water). Another indication that above the TVPT most of the ODNs are oriented with the dye toward the water phase is that the mobility of the dye covalently bound to the ODNs is identical in water and in the collapsed particle shell. The hybridization efficiency between an ODN supported in the particle shell (by adsorbing the ODN below TVPT and subsequently increasing the temperature above TVPT) and the complementary ODN in solution is identical to that of hybridization in water. This result opens good perspectives toward the use of the core-shell thermoresponsive nanoparticles as supports in DNA bioassays.

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13

Min, Yuanzhi, Gao Song, Ling Zhou, Xinyue Wang, Pingying Liu y Jumei Li. "Silver@mesoporous Anatase TiO2 Core-Shell Nanoparticles and Their Application in Photocatalysis and SERS Sensing". Coatings 12, n.º 1 (6 de enero de 2022): 64. http://dx.doi.org/10.3390/coatings12010064.

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Nanostructured noble metal-semiconductor materials have been attracting increasing attention because of their broad application in the field of environmental remediation, sensing and photocatalysis. In this study, a facile approach for fabricating silver@mesoporousanataseTiO2 (Ag@mTiO2) core-shell nanoparticles employing sol-gel and hydrothermal reaction is demonstrated. The Ag@mTiO2nanoparticles display excellent surface-enhanced Raman scattering (SERS) sensitivity and they can detect the methylene blue (MB) molecules with the concentration of as low as 10−8 M. They also exhibit outstanding photocatalytic activity compared with mTiO2, due to the efficient separation and recombination restrain of electron–hole pairs under ultraviolet light. The Ag@mTiO2nanoparticles also present good stability and they can achieve recyclable photocatalytic degradation experiments for five times without loss of activity. Subsequently, the nanoparticles with dual functions were successfully used to in situ monitor the photodegradation process of MB aqueous solution. These results, demonstrating the multifunctional Ag@mTiO2 nanoparticles, hold promising applications for simultaneous SERS analysis and the removal of dye pollutants in environmental field.

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14

Pominova, Daria, Vera Proydakova, Igor Romanishkin, Anastasia Ryabova, Sergei Kuznetsov, Oleg Uvarov, Pavel Fedorov y Victor Loschenov. "Temperature Sensing in the Short-Wave Infrared Spectral Region Using Core-Shell NaGdF4:Yb3+, Ho3+, Er3+@NaYF4 Nanothermometers". Nanomaterials 10, n.º 10 (9 de octubre de 2020): 1992. http://dx.doi.org/10.3390/nano10101992.

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The short-wave infrared region (SWIR) is promising for deep-tissue visualization and temperature sensing due to higher penetration depth and reduced scattering of radiation. However, the strong quenching of luminescence in biological media and low thermal sensitivity of nanothermometers in this region are major drawbacks that limit their practical application. Nanoparticles doped with rare-earth ions are widely used as thermal sensors operating in the SWIR region through the luminescence intensity ratio (LIR) approach. In this study, the effect of the shell on the sensitivity of temperature determination using NaGdF4 nanoparticles doped with rare-earth ions (REI) Yb3+, Ho3+, and Er3+ coated with an inert NaYF4 shell was investigated. We found that coating the nanoparticles with a shell significantly increases the intensity of luminescence in the SWIR range, prevents water from quenching luminescence, and decreases the temperature of laser-induced heating. Thermometry in the SWIR spectral region was demonstrated using synthesized nanoparticles in dry powder and in water. The core-shell nanoparticles obtained had intense luminescence and made it possible to determine temperatures in the range of 20–40 °C. The relative thermal sensitivity of core-shell NPs was 0.68% °C−1 in water and 4.2% °C−1 in dry powder.

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15

Zhang, Lifeng, Xiaoxu Wang, Yong Zhao, Zhengtao Zhu y Hao Fong. "Electrospun carbon nano-felt surface-attached with Pd nanoparticles for hydrogen sensing application". Materials Letters 68 (febrero de 2012): 133–36. http://dx.doi.org/10.1016/j.matlet.2011.10.064.

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16

Yoo, Il-Han, Shankara S. Kalanur y Hyungtak Seo. "Deposition of Pd nanoparticles on MWCNTs: Green approach and application to hydrogen sensing". Journal of Alloys and Compounds 788 (junio de 2019): 936–43. http://dx.doi.org/10.1016/j.jallcom.2019.02.298.

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17

Khosravi, Arezoo, Manouchehr Vossoughi, Saeed Shahrokhian y Iran Alemzadeh. "Magnetic labelled HRP-polymer nanoparticles: A recyclable nanobiocatalyst". Journal of the Serbian Chemical Society 78, n.º 7 (2013): 921–31. http://dx.doi.org/10.2298/jsc120930133k.

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In this paper, the reusability and process stability of nano-reengineered horseradish peroxidase was investigated in fluorescence based sensing system for hydrogen peroxide determination as a model application. To this end, dendron macromolecules were attached to enzyme surface through bio-conjugation techniques. The resulted enzyme-polymer nanoparticles, with average size of 14(?2) nm, showed significant life time and thermal stability. For enzyme recovery and reusability purposes, the enzyme-polymer nanoparticles were labelled with magnetic nanoparticles with a labelling yield of 90%. These labelled enzyme molecules showed significant process stability up to 7 recycling period in a model sensing system. A linear calibration curve was obtained over the hydrogen peroxide concentrations ranging from 5?10-8 mol L-1 to 1?10-5 mol L-1 with detection limit of 1.3?10-9 mol L-1 for the sensing system under the optimal conditions.

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18

Liu, Ying, Huan Zhang, Cong Ma y Nan Sun. "Modified Nimo Nanoparticles for Efficient Catalytic Hydrogen Generation from Hydrous Hydrazine". Catalysts 9, n.º 7 (10 de julio de 2019): 596. http://dx.doi.org/10.3390/catal9070596.

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Precious metal-free NiMoM (M = Pr2O3, Cu2O) catalysts have been synthesized through a simple coreduction method, without any surfactant or support material, and characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The resultant Pr2O3- or Cu2O-modified NiMo catalysts exhibit different structures, which is due to a difference in the synergistic effects of NiMo and the modifying elements. NiMoPr2O3 has an amorphous structure, with low crystallinity and uniform particle dispersion, while NiMo@Cu2O adopts the core–shell structure, where the core and shell are synergistic with each other to promote electron transfer efficiency. The support material-free nanocatalysts Ni9Mo1(Pr2O3)0.375 and Ni4Mo@Cu2O are both highly efficient compared with bimetallic NiMo catalysts, in terms of hydrogen generation from hydrous hydrazine (N2H4·H2O) at 343 K, with total turnover frequencies (TOFs) of 62 h−1 and 71.4 h−1, respectively. Their corresponding activation energies (Ea) were determined to be 43.24 kJ mol−1 and 46.47 kJ mol−1, respectively. This is the first report on the use of Pr-modified NiMo and core–shell NiMo@Cu2O catalysts, and these results may be used to promote the effective application of noble metal-free nanocatalysts for hydrogen production from hydrous hydrazine.

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19

Li, Xiao-Rong, Ming-Chen Xu, Hong-Yuan Chen y Jing-Juan Xu. "Bimetallic Au@Pt@Au core–shell nanoparticles on graphene oxide nanosheets for high-performance H2O2 bi-directional sensing". Journal of Materials Chemistry B 3, n.º 21 (2015): 4355–62. http://dx.doi.org/10.1039/c5tb00312a.

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20

Nguyen Duc, Nghia, Chinh Huynh Dang, Hoang Tran Vinh y Vu Dao Hong. "Peroxidase-like activity of Fe3O4/carbon core-shell nanostructured : effects of carbon shell thickness for application to glucose biosensor". Vietnam Journal of Catalysis and Adsorption 10, n.º 2 (30 de julio de 2021): 109–13. http://dx.doi.org/10.51316/jca.2021.038.

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In this study, we present a protocol for synthesis of carbon coated Fe3O4 nanoparticles with core-shell structured nanocomposite (FeC) following a two steps approach. The peroxidase-like acitivity of the synthesized FeC nanocomposite has been evaluated towards replacing of the horseradish peroxidase enzyme (HRP) in hydrogen peroxide enzymatic biosensor. In which, FeC has catalyzed for a redox reaction 5,5'-tetramethylbenzidine (TMB) and H2O2 to produce oxidized state of TMB with as a blue color. Results exhibited that FeC has a high catalytic activity accepting for fabrication of a high selectivity hydrogen peroxide (H2O2) colorimetric sensor with low detection of limit (LoD) of 0.02 mM H2O2. Based on this finding, we have used FeC and combined with glucose oxidase (GOx) enzyme to construct a new colorimetric glucose biosensor with high selectivity.

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21

Palanisamy, Selvakumar, Chelladurai Karuppiah, Shen-Ming Chen, R. Emmanuel, P. Muthukrishnan y P. Prakash. "Direct electrochemistry of myoglobin at silver nanoparticles/myoglobin biocomposite: Application for hydrogen peroxide sensing". Sensors and Actuators B: Chemical 202 (octubre de 2014): 177–84. http://dx.doi.org/10.1016/j.snb.2014.05.069.

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22

Mikhaylov, Alexey A., Alexander G. Medvedev, Tatiana A. Tripol'skaya, Victor S. Popov, Artem S. Mokrushin, Dmitry P. Krut'ko, Petr V. Prikhodchenko y Ovadia Lev. "H2O2induced formation of graded composition sodium-doped tin dioxide and template-free synthesis of yolk–shell SnO2particles and their sensing application". Dalton Transactions 46, n.º 46 (2017): 16171–79. http://dx.doi.org/10.1039/c7dt03104a.

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23

Khamfoo, Khakkhanang, Matawee Punginsang, Kanittha Inyawilert, Anurat Wisitsoraat, Adisorn Tuantranont y Chaikarn Liewhiran. "Effect of PdO-PdO2 core–shell nanocatalysts on hydrogen sensing performances of flame-made spinel Zn2SnO4 nanoparticles". Applied Surface Science 586 (junio de 2022): 152817. http://dx.doi.org/10.1016/j.apsusc.2022.152817.

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24

Nguyen, Thuy T. D., Dung Van Dao, Dong-Seog Kim, Hu-Jun Lee, Sang-Yeob Oh, In-Hwan Lee y Yeon-Tae Yu. "Effect of core and surface area toward hydrogen gas sensing performance using Pd@ZnO core-shell nanoparticles". Journal of Colloid and Interface Science 587 (abril de 2021): 252–59. http://dx.doi.org/10.1016/j.jcis.2020.12.017.

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Alzahrani, Eman. "Colorimetric Detection of Ammonia Using Synthesized Silver Nanoparticles from Durian Fruit Shell". Journal of Chemistry 2020 (19 de octubre de 2020): 1–11. http://dx.doi.org/10.1155/2020/4712130.

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There has been increased interest in the production of nanoparticles (NP) through green chemistry. This article used durian fruit shell aqueous solution that acts as a reductive preparation of silver NPs. The silver nanoparticles have a size of approximately 25 nm. The NP size uniformity was determined by the SEM and TEM analysis. X-ray diffraction technique was used to characterize crystalline silver nanoparticles face-centered cubic structure. XPS spectrum showed distinct silver peaks on the nanoparticles’ surface. An optical method that was based on surface plasmon resonance (SPR) was used to perform the green Ag NPs aqueous ammonia sensing study. Optical measurement facilitated the ammonia sensing study of Ag NPs that had been prepared. The study also investigated the performance of the optical sensor, thus adding validity to the study. Also, the research sought to determine how the concentration of ammonia in ammonia sensing affects the Ag NPs that had been obtained. The study observed a linear relationship with R2 as the correlation factor which was equal to 0.9831. This was observed from the ammonia concentration plot versus absorption ratio that suggested that there was a linear increase in absorption ratio with increase in ammonia concentration. The study significance is that the room temperature optical ammonia sensor can be used in future for medical diagnosis in the detection of low levels of ammonia in biological fluid like sweat, cerebrospinal fluid, saliva, plasma, or biological samples. This enhances the application of the technique in human biomedical applications.

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Tian, Yuan, Hui Qiao, Tao Yao, Shuguo Gao, Lujian Dai, Jun Zhao, Ying Chen y Pengcheng Xu. "Highly Sensitive MEMS Sensor Using Bimetallic Pd–Ag Nanoparticles as Catalyst for Acetylene Detection". Sensors 22, n.º 19 (2 de octubre de 2022): 7485. http://dx.doi.org/10.3390/s22197485.

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Acetylene detection plays an important role in fault diagnosis of power transformers. However, the available dissolved gas analysis (DGA) techniques have always relied on bulky instruments and are time-consuming. Herein, a high-performance acetylene sensor was fabricated on a microhotplate chip using In2O3 as the sensing material. To achieve high sensing response to acetylene, Pd–Ag core-shell nanoparticles were synthesized and used as catalysts. The transmission electron microscopy (TEM) image clearly shows that the Ag shell is deposited on one face of the cubic Pd nanoseeds. By loading the Pd–Ag bimetallic catalyst onto the surface of In2O3 sensing material, the acetylene sensor has been fabricated for acetylene detection. Due to the high catalytic performance of Pd–Ag bimetallic nanoparticles, the microhotplate sensor has a high response to acetylene gas, with a limit of detection (LOD) of 10 ppb. In addition to high sensitivity, the fabricated microhotplate sensor exhibits satisfactory selectivity, good repeatability, and fast response to acetylene. The high performance of the microhotplate sensor for acetylene gas indicates the application potential of trace acetylene detection in power transformer fault diagnosis.

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Pandey, P. C. y Digvijay Panday. "Tetrahydrofuran and hydrogen peroxide mediated conversion of potassium hexacyanoferrate into Prussian blue nanoparticles: Application to hydrogen peroxide sensing". Electrochimica Acta 190 (febrero de 2016): 758–65. http://dx.doi.org/10.1016/j.electacta.2015.12.188.

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Sowmya, Narsingam, Satish Bykkam y Kalagadda V. Rao. "Synthesis and Characterization of Ceria-Titania (CeO2 - TiO2) Core-Shell Nanoparticles for Enzymatic Bio Sensing Application". Current Nanomaterials 1, n.º 2 (27 de septiembre de 2016): 132–38. http://dx.doi.org/10.2174/2468187306666160722152916.

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Qiu, Lin, Shuwen Zhou, Ying Li, Wen Rui, Pengfei Cui, Changli Zhang, Yongsheng Yu et al. "Silica-Coated Fe3O4 Nanoparticles as a Bifunctional Agent for Magnetic Resonance Imaging and ZnII Fluorescent Sensing". Technology in Cancer Research & Treatment 20 (1 de enero de 2021): 153303382110365. http://dx.doi.org/10.1177/15330338211036539.

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Bifunctional magnetic/fluorescent core-shell silica nanospheres (MNPs) encapsulated with the magnetic Fe3O4 core and a derivate of 8-amimoquinoline (N-(quinolin-8-yl)-2-(3-(triethoxysilyl) propylamino) acetamide) (QTEPA) into the shell were synthesized. These functional MNPs were prepared with a modified stöber method and the formed Fe3O4@SiO2-QTEPA core-shell nanocomposites are biocompatible, water-dispersible, and stable. These prepared nanoparticles were characterized by X-ray power diffraction (XRD), transmission electron microscopy (TEM), thermoelectric plasma Quad II inductively coupled plasma mass spectrometry (ICP-MS), superconducting quantum interference device (SQUID), TG/DTA thermal analyzer (TGA) and Fourier transform infrared spectroscopy (FTIR). Further application of the nanoparticles in detecting Zn2+ was confirmed by the fluorescence experiment: the nanosensor shows high selectivity and sensitivity to Zn2+ with a 22-fold fluorescence emission enhancement in the presence of 10 μM Zn2+. Moreover, the transverse relaxivity measurements show that the core-shell MNPs have T2 relaxivity (r2) of 155.05 mM−1 S−1 based on Fe concentration on the 3.0 T scanner, suggesting that the compound can be used as a negative contrast agent for MRI. Further in vivo experiments showed that these MNPs could be used as MRI contrast agent. Therefore, the new nanosensor provides the dual modality of magnetic resonance imaging and optical imaging.

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30

Zhang, Qian, Minying Wu, Yuanyuan Fang, Chao Deng, Hsin-Hui Shen, Yi Tang y Yajun Wang. "Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application". Nanomaterials 12, n.º 11 (6 de junio de 2022): 1940. http://dx.doi.org/10.3390/nano12111940.

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Mesoporous silica materials have attracted great research interest for various applications ranging from (bio)catalysis and sensing to drug delivery. It remains challenging to prepare hollow mesoporous silica nanoparticles (HMSN) with large center-radial mesopores that could provide a more efficient transport channel through the cell for guest molecules. Here, we propose a novel strategy for the preparation of HMSN with large dendritic mesopores to achieve higher enzyme loading capacity and more efficient bioreactors. The materials were prepared by combining barium sulfate nanoparticles (BaSO4 NP) as a hard template and the in situ-formed 3-aminophenol/formaldehyde resin as a porogen for directing the dendritic mesopores’ formation. HMSNs with different particle sizes, shell thicknesses, and pore structures have been prepared by choosing BaSO4 NP of various sizes and adjusting the amount of tetraethyl orthosilicate added in synthesis. The obtained HMSN-1.1 possesses a high pore volume (1.07 cm3 g−1), a large average pore size (10.9 nm), and dendritic mesopores that penetrated through the shell. The advantages of HMSNs are also demonstrated for enzyme (catalase) immobilization and subsequent use of catalase-loaded HMSNs as bioreactors for catalyzing the H2O2 degradation reaction. The hollow and dendritic mesoporous shell features of HMSNs provide abundant tunnels for molecular transport and more accessible surfaces for molecular adsorption, showing great promise in developing efficient nanoreactors and drug delivery vehicles.

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31

Nguyen, Thi Thuy, Stephanie Lau-Truong, Fayna Mammeri y Souad Ammar. "Star-Shaped Fe3-xO4-Au Core-Shell Nanoparticles: From Synthesis to SERS Application". Nanomaterials 10, n.º 2 (10 de febrero de 2020): 294. http://dx.doi.org/10.3390/nano10020294.

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In this work, the preparation of magneto-plasmonic granular nanostructures and their evaluation as efficient substrates for magnetically assisted surface enhanced Raman spectroscopy (SERS) sensing are discussed. These nanostructures consist of star-shaped gold Au shell grown on iron oxide Fe3-xO4 multicores. They were prepared by seed-mediated growth of anisotropic, in shape gold nanosatellites attached to the surface of polyol-made iron oxide polycrystals. In practice, the 180 nm-sized spherical iron oxide particles were functionalized by (3-aminopropyl) triethoxysilane (APTES) to become positively charged and to interact, in solution, with negatively charged 2 nm-sized Au single crystals, leading to nanohybrids. These hybrids acted subsequently as nucleation platforms for the growth of a branched gold shell, when they were contacted to a fresh HAuCl4 gold salt aqueous solution, in the presence of hydroquinone, a reducing agent, for an optimized nominal weight ratio between both the starting hybrids and the gold salt. As expected, the resulting nanocomposites exhibit a high saturation magnetization at room temperature and a rough enough plasmonic surface, making them easily attracted by a lab. magnet, while exhibiting a great number of SERS hot spots. Preliminary SERS detection assays were successfully performed on diluted aqueous thiram solution (10−8 M), using these engineered substrates, highlighting their capability to be used as chemical trace sensors.

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32

Chomkitichai, Weerasak, Hathaithip Ninsonthi, Chaikarn Liewhiran, Anurat Wisitsoraat, Saengrawee Sriwichai y Sukon Phanichphant. "Flame-Made Pt-Loaded TiO2Thin Films and Their Application as H2Gas Sensors". Journal of Nanomaterials 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/497318.

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The hydrogen gas sensors were developed successfully using flame-made platinum-loaded titanium dioxide (Pt-loaded TiO2) nanoparticles as the sensing materials. Pt-loaded TiO2thin films were prepared by spin-coating technique onto Al2O3substrates interdigitated with Au electrodes. Structural and gas-sensing characteristics were examined by using scanning electron microscopy (SEM) and showed surface morphology of the deposited film. X-ray diffraction (XRD) patterns can be confirmed to be the anatase and rutile phases of TiO2. High-resolution transmission electron microscopy (HRTEM) showed that Pt nanoparticles deposited on larger TiO2nanoparticles. TiO2films loaded with Pt nanoparticles were used as conductometric sensors for the detection of H2. The gas sensing of H2was studied at the operating temperatures of 300, 350, and 400°C in dry air. It was found that 2.00 mol% Pt-loaded TiO2sensing films showed higher response towards H2gas than the unloaded film. In addition, the responses of Pt-loaded TiO2films at all operating temperatures were higher than that of unloaded TiO2film. The response increased and the response time decreased with increasing of H2concentrations.

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33

Pandey, Prem Chandra y Dheeraj Singh Chauhan. "3-Glycidoxypropyltrimethoxysilane mediated in situ synthesis of noble metal nanoparticles: Application to hydrogen peroxide sensing". Analyst 137, n.º 2 (2012): 376–85. http://dx.doi.org/10.1039/c1an15843k.

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34

GOWTHAMAN, N. S. K. y S. ABRAHAM JOHN. "Electroless deposition of Gold-Platinum Core@Shell Nanoparticles on Glassy Carbon Electrode for Non-Enzymatic Hydrogen Peroxide sensing#". Journal of Chemical Sciences 128, n.º 3 (13 de febrero de 2016): 331–38. http://dx.doi.org/10.1007/s12039-016-1038-8.

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35

Singh, Vinod, Shivani Dhall, Akshey Kaushal y Bodh R. Mehta. "Room temperature response and enhanced hydrogen sensing in size selected Pd-C core-shell nanoparticles: Role of carbon shell and Pd-C interface". International Journal of Hydrogen Energy 43, n.º 2 (enero de 2018): 1025–33. http://dx.doi.org/10.1016/j.ijhydene.2017.11.143.

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36

Guo, Ruochen, Yanru Wang, Shaoxuan Yu, Wenxin Zhu, Fangqing Zheng, Wei Liu, Daohong Zhang y Jianlong Wang. "Dual role of hydrogen peroxide on the oxidase-like activity of nanoceria and its application for colorimetric hydrogen peroxide and glucose sensing". RSC Advances 6, n.º 65 (2016): 59939–45. http://dx.doi.org/10.1039/c6ra09217a.

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Nanoceria (cerium oxide nanoparticles) exhibits excellent catalytic activity towards chromogenic substrate 3,3,5,5-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H₂O₂), which has been reported.

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37

Lian, Jiajia, Dexin Yin, Shuang Zhao, Xixi Zhu, Qingyun Liu, Xianxi Zhang y Xiao Zhang. "Core-shell structured Ag-CoO nanoparticles with superior peroxidase-like activity for colorimetric sensing hydrogen peroxide and o-phenylenediamine". Colloids and Surfaces A: Physicochemical and Engineering Aspects 603 (octubre de 2020): 125283. http://dx.doi.org/10.1016/j.colsurfa.2020.125283.

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38

Pandey, Prem C. y Ashish K. Pandey. "Novel synthesis of Prussian blue nanoparticles and nanocomposite sol: Electro-analytical application in hydrogen peroxide sensing". Electrochimica Acta 87 (enero de 2013): 1–8. http://dx.doi.org/10.1016/j.electacta.2012.08.069.

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39

Baghayeri, Mehdi, Hojat Veisi, Samaneh Farhadi, Hadi Beitollahi y Behrooz Maleki. "Ag nanoparticles decorated Fe3O4/chitosan nanocomposite: synthesis, characterization and application toward electrochemical sensing of hydrogen peroxide". Journal of the Iranian Chemical Society 15, n.º 5 (15 de enero de 2018): 1015–22. http://dx.doi.org/10.1007/s13738-018-1298-y.

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40

Hwang, Sung-Ho, Young Kwang Kim, Soon Moon Jeong, Changsoon Choi, Ka Young Son, Soo-Keun Lee y Sang Kyoo Lim. "Wearable colorimetric sensing fiber based on polyacrylonitrile with PdO@ZnO hybrids for the application of detecting H2 leakage". Textile Research Journal 90, n.º 19-20 (25 de marzo de 2020): 2198–211. http://dx.doi.org/10.1177/0040517520912729.

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A colorimetric hydrogen sensor has great potential for accurately detecting and monitoring the leakage of hydrogen gas on account of its fast color change in contact with hydrogen gas. However, for the practical application of the sensor, such as in gas detection systems in clothing, the flexibility and stability of the sensor need to be improved. Here, we present a novel method to fabricate a flexible colorimetric hydrogen sensor with the stable embedment of sensing material. To improve the flexibility and stability of the sensor, polyacrylonitrile nanofiber containing palladium oxide and zinc oxide hybrid nanoparticles was prepared by electrospinning. The flexible colorimetric hydrogen sensor can detect 1000 ppm hydrogen gas with excellent selectivity within 2 min. We also suggest film and yarn-type flexible colorimetric hydrogen sensors for industrial and wearable applications. A laminating process was used to prepare the film. In contrast, twisting and polydimethylsiloxane coating were used to prepare the yarn-type flexible colorimetric hydrogen sensor. Compared with a flexible colorimetric hydrogen-sensing nanofiber, the film and yarn show identical sensitivity for detecting a hydrogen leakage. These applications of hydrogen sensors could be a new insight into the design of a flexible sensor for detecting hydrogen leakage with the naked eye.

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41

Manivannan, Shanmugam y Ramasamy Ramaraj. "Core-shell Au/Ag nanoparticles embedded in silicate sol-gel network for sensor application towards hydrogen peroxide". Journal of Chemical Sciences 121, n.º 5 (septiembre de 2009): 735–43. http://dx.doi.org/10.1007/s12039-009-0088-6.

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42

Sasikumar, Thangarasu y Malaichamy Ilanchelian. "A simple assay for direct visual and colorimetric sensing application of cysteamine using Au@Ag core-shell nanoparticles". Optical Materials 109 (noviembre de 2020): 110237. http://dx.doi.org/10.1016/j.optmat.2020.110237.

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43

Kundu, Manas Kumar, Mriganka Sadhukhan y Sudip Barman. "Ordered assemblies of silver nanoparticles on carbon nitride sheets and their application in the non-enzymatic sensing of hydrogen peroxide and glucose". Journal of Materials Chemistry B 3, n.º 7 (2015): 1289–300. http://dx.doi.org/10.1039/c4tb01740d.

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A facile fabrication of an ordered assembly of silver nanoparticles on carbon nitride sheets is reported. A modified glassy carbon electrode with carbon nitride sheets doped with silver nanoparticles can be used as a sensitive electrochemical sensor for hydrogen peroxide and glucose.

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44

Tang, Li, Shi Mo, Shi Gang Liu, Na Li, Yu Ling, Nian Bing Li y Hong Qun Luo. "Preparation of bright fluorescent polydopamine-glutathione nanoparticles and their application for sensing of hydrogen peroxide and glucose". Sensors and Actuators B: Chemical 259 (abril de 2018): 467–74. http://dx.doi.org/10.1016/j.snb.2017.12.071.

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45

Wang, Handong, Huahua Wang, Tengfei Li, Jie Ma, Kai Li y Xia Zuo. "Silver nanoparticles selectively deposited on graphene-colloidal carbon sphere composites and their application for hydrogen peroxide sensing". Sensors and Actuators B: Chemical 239 (febrero de 2017): 1205–12. http://dx.doi.org/10.1016/j.snb.2016.08.143.

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46

Mu, Jianshuai, Li Zhang, Min Zhao y Yan Wang. "Co3O4 nanoparticles as an efficient catalase mimic: Properties, mechanism and its electrocatalytic sensing application for hydrogen peroxide". Journal of Molecular Catalysis A: Chemical 378 (noviembre de 2013): 30–37. http://dx.doi.org/10.1016/j.molcata.2013.05.016.

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47

Hemmati, Saba, Mehdi Baghayeri, Sanaz Kazemi y Hojat Veisi. "Biosynthesis of silver nanoparticles using oak leaf extract and their application for electrochemical sensing of hydrogen peroxide". Applied Organometallic Chemistry 32, n.º 11 (3 de septiembre de 2018): e4537. http://dx.doi.org/10.1002/aoc.4537.

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48

Lete, Cecilia, Adela-Maria Spinciu, Maria-Gabriela Alexandru, Jose Calderon Moreno, Sorina-Alexandra Leau, Mariana Marin y Diana Visinescu. "Copper(II) Oxide Nanoparticles Embedded within a PEDOT Matrix for Hydrogen Peroxide Electrochemical Sensing". Sensors 22, n.º 21 (28 de octubre de 2022): 8252. http://dx.doi.org/10.3390/s22218252.

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The aim of this study is the preparation of nanostructured copper(II) oxide-based materials (CuONPs) through a facile additive-free polyol procedure that consists of the hydrolysis of copper(II) acetate in 1,4-butane diol and its application in hydrogen peroxide sensing. The nonenzymatic electrochemical sensor for hydrogen peroxide determination was constructed by drop casting the CuONP sensing material on top of a glassy carbon electrode (GCE) modified by a layer of poly(3,4-ethylenedioxythiophene) conducting polymer (PEDOT). The PEDOT layer was prepared on GCE using the sinusoidal voltage method. The XRD pattern of the CuONPs reveals the formation of the monoclinic tenorite phase, CuO, with average crystallite sizes of 8.7 nm, while the estimated band gap from UV–vis spectroscopy is of 1.2 eV. The SEM, STEM, and BET analyses show the formation of quasi-prismatic microaggregates of nanoparticles, with dimensions ranging from 1 µm up to ca. 200 µm, with a mesoporous structure. The developed electrochemical sensor exhibited a linear response toward H2O2 in the concentration range from 0.04 to 10 mM, with a low detection limit of 8.5 μM of H2O2. Furthermore, the obtained sensor possessed an excellent anti-interference capability in H2O2 determination in the presence of interfering compounds such as KNO3 and KNO2.

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49

Guo, Huizhang, Yuanzhi Chen, Xiaozhen Chen, Ruitao Wen, Guang-Hui Yue y Dong-Liang Peng. "Facile synthesis of near-monodisperse Ag@Ni core–shell nanoparticles and their application for catalytic generation of hydrogen". Nanotechnology 22, n.º 19 (23 de marzo de 2011): 195604. http://dx.doi.org/10.1088/0957-4484/22/19/195604.

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50

Murugavelu, M. y B. Karthikeyan. "Synthesis, characterization of Ag-Au core-shell bimetal nanoparticles and its application for electrocatalytic oxidation/sensing of l-methionine". Materials Science and Engineering: C 70 (enero de 2017): 656–64. http://dx.doi.org/10.1016/j.msec.2016.09.046.

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