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Ubiquitous Sensor Network for chemical sensors

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稀有金属材料与工程 2006年第A3期35卷 400-404页

作者： Wan-Young Chung Risto Myllylae Division of Computer & Internet Eng. Dongseo UniversityBusan 617-716Korea Dept.of Electrical and Information Eng. University of OuluLinnanmaa 90570 OuluFinland

Wireless sensor networks have been identified as one of the most important technologies for the 21 st *** advances in micro sensor fabrication technology and wireless communication technology enable the practical deployment of large-scale,low-power,inexpensive sensor *** an approach offers an advantage over traditional sensing methods in many ways:large-scale,dense deployment not only extends spatial coverage and achieves higher resolution,but also increases the system's fault-tolerance and ***,the ad-hoc nature of wireless sensor networks makes them even more attractive for military and other risk-associated applications,such as environmental observation and habitat monitoring.

关键词： ubiquitous sensor network wireless sensor network sensor network platform sensor node chemical sensors

Electric tuning of plasmonic resonances in ultrathin gold nanoribbon arrays

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Photonics Research 2024年第08期12卷 1750-1759页

作者： ZHENXIN WANG ALEXEY V.KRASAVIN CHENXINYU PAN JUNSHENG ZHENG ZHIYONG LI XIN GUO ANATOLY V.ZAYATS LIMIN TONG PAN WANG State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University Department of Physics and London Centre for Nanotechnology King's College London Jiaxing Key Laboratory of Photonic Sensing & Intelligent Imaging Intelligent Optics & Photonics Research Center Jiaxing Research Institute Zhejiang University

Ultrathin plasmonic nanostructures offer an unparalleled opportunity for the study of light–matter interactions at the nanoscale and realization of compact nanophotonic devices. In this study, we introduce an ultrathin gold nanoribbon array and demonstrate an electric approach to actively tuning its plasmonic resonance, which leveraging the extreme light confinement capability in the ultrathin plasmonic nanostructure and a robust nanoscale electro-optical effect in indium tin oxide. Optimizing the design(to a total thickness as small as 12 nm for a 2-nmthick gold nanoribbon array), we numerically demonstrate a spectral shift in the plasmonic resonance up to 36 nm along with an approximately 16% change in the transmission at a gate voltage below 1.7 V at the wavelength of1.47 μm. This work presents progress towards electric tuning of plasmonic resonances in ultrathin metallic nanostructures for various applications including surface-enhanced spectroscopy, spontaneous emission enhancement,and optical modulation.

关键词： chemical sensors Diffraction limit Electrooptical effects Indium tin oxide Light matter interactions Nanostructures

A highly sensitive chemical gas detecting transistor based on highly crystalline CVD-grown MoSe2 films

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Nano Research 2017年第6期10卷 1861-1871页

作者： Jongyeol Baek Demin Yin Na Liu Inturu Omkaram Chulseung Jung Healin Im Seongin Hong Seung Min Kim Young Ki Hong Jaehyun Hur Youngki Yoon Sunkook Kim Multi-Functional Nano/Bio Electronics Lab. Kyung Hee University Gyeonggi 446-701 Republic of Korea Department of Electrical and Computer Engineering & Waterloo Institute for Nanotechnology (WIN) University of Waterloo Waterloo ON N2L 3GI Canada Institute of Advanced Composite Materials Korea Institute of Science and Technology (KIST) Jeonbuk 565-905 Republic of Korea Department of chemical and Biological Engineering Gachon University Seongnam-si Gyeonggi 13120 Republic of Korea

Layered semiconductors with atomic thicknesses are becoming increasingly important as active elements in high-performance electronic devices owing to their high carrier mobilities, large surface-to-volume ratios, and rapid electrical responses to their surrounding environments. Here, we report the first implementation of a highly sensitive chemical-vapor-deposition-grown multilayer MoSe2 field-effect transistor （FET） in a NO2 gas sensor. This sensor exhibited ultra-high sensitivity （S = ca. 1,907 for NO2 at 300 ppm）, real-time response, and rapid on-off switching. The high sensitivity of our MoSe2 gas sensor is attributed to changes in the gap states near the valence band induced by the NO2 gas absorbed in the MoSe2, which leads to a significant increase in hole current in the off-state regime. Device modeling and quantum transport simulations revealed that the variation of gap states with NO2 concentration is the key mechanism in a MoSe2 FET-based NO2 gas sensor. This comprehensive study, which addresses material growth, device fabrication, characterization, and device simulations, not only indicates the utility of MoSe2 FETs for high-performance chemical sensors, but also establishes a fundamental understanding of how surface chemistry influences carrier transport in layered semiconductor devices.

关键词： transition metaldichalcogenides MoSe2 chemical sensors chemical vapor depositon

Two-Channel Highly Sensitive sensors Based on 4 × 4 Multimode Interference Couplers

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Photonic sensors 2017年第4期7卷 357-364页

作者： Trung-Thanh LE International School (VNU-IS) Vietnam National University (VNU) Hanoi Vietnam

We propose a new kind of microring resonators （MRR） based on 4 × 4 multimode interference （MMI） couplers for multichannel and highly sensitive chemical and biological sensors. The proposed sensor structure has advantages of compactness and high sensitivity compared with the reported sensing structures. By using the transfer matrix method （TMM） and numerical simulations, the designs of the sensor based on silicon waveguides are optimized and demonstrated in detail. We apply our structure to detect glucose and ethanol concentrations simultaneously. A high sensitivity of 9000 nm/RIU, detection limit of 2 × 10^-4 for glucose sensing and sensitivity of 6000 nm/RIU, detection limit of 1.3 × 10^-5 for ethanol sensing are achieved.

关键词： Biological sensors chemical sensors optical microring resonators high sensitivity multimodeinterference transfer matrix method beam propagation method (BPM) multichannel sensor

Electrochemically driven dynamic plasmonics

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Advanced Photonics 2021年第4期3卷 19-34页

作者： Yan Jin Lin Zhou Jie Liang Jia Zhu Nanjing University College of Engineering and Applied SciencesNational Laboratory of Solid State MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjingChina Nanjing University Key Laboratory of Intelligent Optical Sensing and ManipulationMinistry of EducationNanjingChina

Dynamic plasmonics with the real-time active control capability of plasmonic resonances attracts much interest in the communities of physics,chemistry,and material *** versatile reconfigurable strategies for dynamic plasmonics,electrochemically driven strategies have garnered most of the *** summarize three primary strategies to enable electrochemically dynamic plasmonics,including structural transformation,carrier-density modulation,and electrochemically active surrounding-media *** reconfigurable microstructures,optical properties,and underlying physical mechanisms are discussed in *** also summarize the most promising applications of dynamic plasmonics,including smart windows,structural color displays,and chemical *** suggest more research efforts toward the widespread applications of dynamic plasmonics.

关键词： dynamic plasmonics structural transformation carrier-density modulation electrochemically active surrounding-media manipulation smart windows structural color displays chemical sensors

Design optimization of highly sensitive LSPR enhanced surface plasmon resonance biosensors with nanoholes

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Chinese Optics Letters 2008年第5期6卷 323-326页

作者：吴斌王庆康 National Key Laboratory of Micro/Nano Fabrication Technology Key Laboratory for Thin Film and Microfabrication Technology of Ministry of EducationResearch Institute of Micro/Nano Science and TechnologyShanghai Jiao Tong University

For breaking through the sensitivity limitation of conventional surface plasmon resonance （SPR） biosensors, novel highly sensitive SPR biosensors with Au nanopartieles and nanogratings enhancement have been proposed recently. But in practice, these structures have obvious disadvantages. In this study, a nanohole based sensitivity enhancement SPR biosensor is proposed and the influence of different structural parame- ters on the performance is investigated by using rigorous coupled wave analysis （RCWA）. Electromagnetic field distributions around the nanohole are also given out to directly explain the performance difference for various structural parameters. The results indicate that significant sensitivity increase is associated with localized surface plasmons （LSPs） excitation mediated by nanoholes. Except to outcome the weakness of other LSP based biosensors, larger resonance angle shift, reflectance amplitude, and sharper SPR curves＇ width are obtained simultaneously under optimized structural parameters.

关键词： Biosensors chemical sensors Curve fitting Electric fields Electromagnetic fields Gold Nanostructured materials Optical data storage Optimization Plasmons Resonance Sensitivity analysis Signal transduction

Noble and valuable: atomically precise gold nanoclusters

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Science China Chemistry 2016年第2期59卷 206-208页

作者： Shuxin Wang Haizhu Yu Manzhou Zhu Department of Chemistry and Center for Atomic Engineering of Advanced Materials Anhui University

Atomically precise gold nanoclusters have recently attracted intensive attention due to their significance in catalysis,chemical sensing,and *** nanoclusters often possess unique optical,chemical or physical propertie... 详细信息

关键词： chemical sensors Gold

Gas-sensing Properties of Sintered Bismuth Iron Tungstate

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Rare Metals 1995年第3期14卷 179-184页

作者：胡兴定张文朴张改莲北京有色金属研究总院北京北京师范大学化学系北京

Gas sensor materials of bismuth tungstate and bismuth iron tungstate were prepared. Sintered bismuth iron tungstate gas sensors have a high sensitivity and selectivity to ethanol and acetone, show long-term stability of response under most operating conditions and insensitivity to atmospheric humidity and respond more quickly in relative case. The changes of the sensors in conductance are mediated by oxygen vacancy donors which caused by the direct reduction. Also, they are highly mobile and can quickly diffuse through the sample, thereby having a direct effect on the electronic carrier density. The phase composition and structure of these gas sensor materials were investigated by XRD technique.

关键词： Ceramic materials chemical sensors Ore sintering Physical properties Tungsten compounds

chemical Investigation of the NO_x Detection Mechanisms by Semiconductor Metal Oxide Nanoparticles

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稀有金属材料与工程 2006年第A3期35卷 40-42页

作者： Marie-Isabelle Baraton Lhadi Merhari SPCTS-UMR CNRS 6638 Faculty of SciencesF-87060 LimogesFrance CERAMEC R&D F-87000 LimogesFrance

This work reports an FTIR study of the NO_x adsorption/desorption cycles on tin oxide nanosized particles under the operating conditions of real sensors (150℃,in presence of O_2).The chemical reactions are monitored in situ and correlated with the variations of the SnO_2 electrical *** the basis of the FTIR spectra,two contributing mechanisms for the NO_x detection are *** first one presents the formation of bridged nitrate groups bound to the SnO_2 surface via oxygen vacancies acting as electron donor *** second mechanism also involves surface oxygen vacancies in the coordination of NO_x,but this time the formation of NO_x anionic species is *** mechanisms lead to the decrease of the electrical conductivity under NO_x ***,the bridged nitrate groups are not reversible under gas desorption and thus irreversibly contaminate the surface after the first NO_x *** the contrary,the nitrosyl anionic species are reversible and,from the second NO_x adsorption/desorption cycle,ensure the reproducibility of the sensor response.

关键词： NO_x detection surface reactions FTIR spectroscopy Tin oxide SnO2 nanoparticles chemical sensors