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Finite element simulation of Love wave sensor for the detection of volatile organic gases

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Chinese Physics B 2022年第3期31卷 241-247页

作者： Yan Wang Su-Peng Liang Shu-Lin Shang Yong-Bing Xiao Yu-Xin Yuan College of Electronic and Optical Engineering & College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China

The three-dimensional(3D) finite element(FE) simulation and analysis of Love wave sensors based on polyisobutylene(PIB) layers/SiO_(2)/ST-90°X quartz structure are presented in this paper, as well as the investigation of coupled resonance effect on the acoustic properties of the devices. The mass sensitivity of the basic Love wave device with SiO_(2)guiding layers is solved analytically. And the highest mass sensitivity of 128 m^(2)/kg is obtained as h_(s)/λ = 0.175. The sensitivity of the Love wave sensors for sensing volatile organic compounds(VOCs) is greatly improved due to the presence of coupled resonance induced by the PIB nanorods on the device surface. The frequency shifts of the sensor corresponding to CH_(2)Cl_(2),CHCl_(3), CCl_(4), C_(2)Cl_(4), CH_(3)Cl and C_(2)HCl_(3) with the concentration of 100 ppm are 1.431 kHz, 5.507 kHz, 13.437 kHz,85.948 kHz, 0.127 kHz and 17.879 kHz, respectively. The viscoelasticity influence of the sensitive material on the characteristics of SAW sensors is also studied. By taking account of the viscoelasticity of the PIB layers, the sensitivities of the SAW sensors with the PIB film and PIB nanorods decay in different degree. The gas sensing property of the Love wave sensor with PIB nanorods is superior to that of the PIB films. Meanwhile, the Love wave sensors with PIB sensitive layers show good selectivity to C_(2)Cl_(4), making it an ideal selection for gas sensing applications.

关键词： gas sensor coupled resonance nano-structure Love wave

Pd-gate MOS sensor for detection of methanol and propanol

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Journal of Natural gas Chemistry 2011年第2期20卷 123-127页

作者： Preeti Pandey J. K. Srivastava V. N. Mishra R. Dwivedi Center for Research in Microelectronics Department of Electronics Engineering Institute of Technology Banaras Hindu University

The present paper focused on the detection of methanol and propanol using Pd-gate metal-oxide-semiconductor （MOS） sensor. Surface mor- phology and composition of the gate film were studied by scanning electron microscopy （SEM） and atomic force microscopy （AFM）. The response of the sensor for propanol and methanol was measured as shift in capacitance-voltage （C-V） and conductance-voltage （G-V） curves of the MOS structure. The sensitivity of the sensor towards methanol was found to be greater than that towards propanol. It was 58.2% for methanol and 32% for propanol （at 0.6 V, 1 MHz） in terms of capacitance measurements, while in terms of conductance results the sensitivity was found to be 57.2% for methanol and 38.9% for propanol at 1 kHz. The discontinuities or cracks present in the microstructure of the gate material are believed to be mainly responsible for the high sensitivity of the sensor, going with the decomposition of gas molecules and subsequent hydrogen permeation through Pd.

关键词： MOS structure gas sensor palladium cracks sensitivity

Structural and micro structural studies of PbO-doped SnO_2 sensor for detection of methanol, propanol and acetone

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Journal of Natural gas Chemistry 2011年第2期20卷 179-183页

作者： J. K. Srivastava Preeti Pandey V. N. Mishra R. Dwivedi Center for Research in Microelectronics Department of Electronics Engineering Institute of Technology Banaras Hindu University

In the present work the structural information of PbO-doped SnO2 thick film sensor has been investigated with X-ray diffractometer （XRD） and scanning electron microscope （SEM）. Initially, SnO2 powder was derived using sol-gel process and was subsequently doped with PbO and ground up to nanosized particles. A suitable gas sensor structure was fabricated on 1′′×1′′ alumina substrate using thick film technology. The necessary paste for screen printing was also developed. SEM results showed sol-gel derived powder gets more agglomerated in the thick film form. The sensitivity of the sensor has been investigated at different temperatures （150 ？C？350 ？C） upon exposure to methanol, propanol and acetone, yielding a maximum at 250 ？C for acetone with 1 wt% PbO-doping while at 350 ？C for propanol with 3 wt% PbO-doping of the sensor. The reduction of particle size to nanometers （validated through XRD） leads to a dramatic improvement in sensitivity of sensors for the chosen organic vapors. The results also correlate well with the microstructural properties of the material and the dopant.

关键词： gas sensor nanosized SnO2 Sol-gel thick film

Fiber-optic dual Fabry-Pérot interferometric carbon monoxide sensor with polyaniline/Co3O4/graphene oxide sensing membrane

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Chinese Chemical Letters 2020年第8期31卷 2145-2149页

作者： Jin Peng Jie Liao Xiaozhan Yang Wenlin Feng Department of Physics and Energy Chongqing University of TechnologyChongqing 400054China Chongqing Key Laboratory of Green Energy Materials Technology and Systems Chongqing 400054China

An optical fiber dual Fabry-Perot interferometric carbon monoxide gas sensor based on PANI/Co3 O4/GO(PCG)sensing membrane coated on the end face of the optical fiber is proposed and *** end face of photonic crystal fiber(PCF)without cut-off wavelength is fused with a single-mode fiber(SMF),and the other end face of the PCF is coated with PCG sensing *** collapsed layer formed during the air hole fusion of PCF is used as the first reflector,the interface between PCF and sensing membrane is used as the second reflector,and the interface between the sensing membrane and the air is used as the third reflector,thus the dual Fabry-Pe rot structure sensor is *** results show that the sensor has excellent sensitivity and selectivity to carbon *** the increasing concentration of carbon monoxide gas in the range of 0-60 ppm,the intensity of interference spectrum *** sensitivity of the sensor is 0.3473 dB m/ppm,and its linearity is *** response time and recovery time are 68 s and 106 s,*** sensor has the advantages of the compact size,low cost,high sensitivity,strong selectivity and simple *** is suitable for the sensing detection of low concentration carbon monoxide gas.

关键词： Carbon monoxide Dual Fabry-Perot interferometer gas sensor PANI/Co3O4/GO Sensing membrane

Fabrication of high sensitivity 2-PEA sensor based on Aldehyde-functionalized mesoporous carbon

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Chinese Chemical Letters 2023年第1期34卷 499-502页

作者： Ye Zhu Yongheng Zhu Jiaqiang Xu Department of Stomatology Huashan Hospital Affiliated to Fudan UniversityShanghai 200040China Department of Physics&Department of Chemistry College of ScienceShanghai UniversityShanghai 200444China College of Food Science&Technology Shanghai Ocean UniversityShanghai 213064China

2-Phenylethylamine(2-PEA)is one of the main ingredients for ***,it is necessary to limit its use and illegal trade by conveniently detecting 2-PEA ***,a QCM based 2-PEA gas sensor was constructed by using aldehyde functionalized mesoporous carbon(FDU-15-CHO)as sensing materials designed according to Schiff base adsorption *** 2D hexagonal mesoporous structures of the sensing material have been confirmed by small-angle X-ray diffraction(SXRD),transmission electron microscopy(TEM),and N2adsorption-desorption *** covalent grafting of aldehyde group onto the FDU-15 was confirmed by Fourier transform infrared spectroscopy(FT-IR).FDU-15-CHO based Quartz Crystal Microbalance(QCM)sensor shows better sensitivity to 2-PEA than its parent ***,the detection limit of FDU-15-CHO based sensor can reach down to 1 ppm,and its selectivity and reproducibility are *** high concentrations of active sites in the mesopores of FDU-15 are believed to facilitate 2-PEA adsorption,and thus the presence of the-CHO group leading to sensitive and selective response,which is verified by Gaussian simulation.

关键词： Quartz crystal microbalance(QCM) 2-Phenylethylamine FDU-15-CHO gas sensor Gaussian software

gasoline sensor Based on Flower-Like ZnO

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稀有金属材料与工程 2006年第A3期35卷 106-109页

作者： Xu Jiaqiang Chen Yuping Li Chao Shen Jianian College of Materials and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China Institute of Materials Shanghai University Shanghai 200072 China

Flower-like ZnO was prepared through a hydrothermal process using zinc sulfate as raw *** microstructure and morphology of the samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM).XRD results showed that the as-obtained sample could be indexed to hexagonal wurtzite *** results revealed that the ZnO sample presented flower-like *** gas sensors were prepared with the traditional sintering process and their gas sensitivities were *** gas sensitivity results showed that the sensors based on flower-like ZnO were very sensitive to dilute 90~# *** relatively high sensitivity and selectivity of these sensors made from flower-like ZnO demonstrated the potential for developing a new class of selective gasoline sensors.

关键词： hydrothermal process gas sensor zinc oxide gasoline

Methane sensor based on palladium/MWNT nanocomposites

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Chinese Chemical Letters 2009年第5期20卷 608-610页

作者： Zhong Ping Li Yong Guo Suo Zhu Wu Shao Min Shuang Chuan Dong Research Center of Environmental Science and Engineering School of Chemistry and Chemical Engineering Shanxi University Taiyuan 030006 PR China School of Chemistry Shanxi Datong University Datong 037009 PR China

Methane gas sensor was fabricated based on electrocatalytic properties of the Pd/MWNT nanocomposites on indium tin oxide （ITO） glass substrates. A linear response for methane was obtained in the range of 0-16% （v/v） with a detection limit of 0.167% （v/ v） and R.S.D. of 4.1%. After 100 times sensing or stable stored more than 12 months in atmosphere, unconspicuous measurable decrease was observed. The response time was less than 60 s at room temperature and ambient pressure. Some common potential interferents in samples such as N2, CO, CO2, ethane, propane, pentane, methanol, ethanol, H2 and NH3 were investigated and all the effects were less than 5% on the response for 3.0% （v/v） methane. The sensor was applied to methane determinations in man-made gas samples, the results are satisfied.

关键词： Methane gas sensor PaUadium/MWNTs Electrocatalysis

Characteristics and Application of Conducting Polymer sensor

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稀有金属材料与工程 2006年第A3期35卷 479-482页

作者： Joon-Boo Yu Jeung-Soo Huh Department of Material Science and Metallurgy Kyungpook National UniversityDaegu 702-701Korea

Conducting polymers sensors have been very interesting that it can detect wide variety of functionalities,however these materials have to solve humidity contaminant,poor reversibility and *** improve this problems,we investigated pretreatment such as soaking in methanol and thermal treatment in N_*** process improved stability, reversibility and response time and recovery *** overcome humidity contaminant coated hydrophobic polymer was reduced above 50% at RH10%.For sensor array structure was fabricated for enhancing selectivity of gas *** polymer sensor array had several application in environmental and medical science the method of principal component analysis.

关键词： conducting polymer VOCs gas sensor

H_2S Sensing Characteristics of Thin Film SnO_2 sensor with N_2 Treatment

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稀有金属材料与工程 2006年第A3期35卷 385-388页

作者： Jong-Won Kim Kwang-Hyun Yun Geon-Young Cha Gi-Hong Rue Duk-Dong Lee Jeung-Soo Huh Department of Nano-Science and Technology Sangyuk-Dong 1370Bukgu DaeguKorea Department of Materials Science and Metallurgy Sangyuk-Dong 1370Bukgu DaeguKorea School of Electronic Engineering Kyungpook National UniversitySangyuk-Dong 1370Bukgu DaeguKorea Department of Nano-Science and Technology Department of Materials Science and MetallurgySangyuk-Dong 1370Bukgu DaeguKorea

SnO_2 thin film sensors were fabricated by a thermal evaporation *** sensors were heated for thermal *** high porosity,SnO_2 thin film sensors were treated in a N_2 *** sensors that were treated with O_2 after being treated with N_2 showed 70 % sensitivity for 1×10~ -6) of H_2S,which is higher than the sensors that were only treated with O_*** Ni metal,as a catalyst,was evaporated on the thin film Sn on the Al_2O_3 *** sensor was heated to grow the Sn nanowire in a tube furnace with N_2 *** nanowire was heated for *** sensitivity of SnO_2 nanowire sensor was measured for 500×10~ -9) of H_*** selectivity of the SnO_2 nanowire sensor was compared with the thin film and the thick film SnO_*** sensor was measured for H_2S,CO,and NH_3 in this study.

关键词： SnO2 gas sensor N2 nanowire H2S