SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Han Jin,Youju Huang,Jiawen Jian
Plate-like Cr 2 O 3 has been proved to be highly selective in sensing of nitric oxide (NO), while the sensing response of irregular shape and cubic-like Cr 2 O 3 toward NO was significantly interfered by hydrocarbons (HCs), e.g. C 3 H 6 . In this paper, sensing mechanism of the plate-like Cr 2 O 3 for selective sensing of NO (against HCs) was studied via crystallographic phase analysis, lattice fringes investigation and evaluation of the catalytic activity (gas-phase catalytic activity & electrochemical catalytic activity). The Cr 2 O 3 samples with plate-like, irregular shape and cubic-like microstructures have been confirmed to be the same crystallographic phase through XRD measurements, however, significant difference in the lattice fringes of these Cr 2 O 3 samples were observed via high-resolution transmission electron microscopy (HRTEM) & selected-area electron diffraction (SAED). The comparison results of catalytic activity for plate-like, irregular shape and cubic-like Cr 2 O 3 indicated that the unique selectivity for the plate-like Cr 2 O 3 was mainly caused by the electrochemical reaction specifically toward NO, which occurred near the interface between plate-like Cr 2 O 3 and zirconia-based electrolyte.
研究领域:
材料科学
·
化学工程
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yinghao Jia,Xin Hu,Hengjie Huang,Yangcan Deng,Wenning Cao,Ying Zhou,Xinghui Hou
CS- x ( x = 1, 2, 4, 6) nanoparticles have been successfully prepared by simple hydrothermal method combined with calcination process, and the calcination time is adjusted to optimize micro-structure characterization for their enhanced NO-sensing. The techniques of XRD, Raman, SEM, TEM, TGA, DSC, BET, and XPS are used to study their phase structure, micro-morphology, thermal decomposition process and surface states, then the possible gas-sensitive mechanism is analyzed. Results show that the typical CS-2 sensor has the maximum response of 130–50 ppm NO at 90 ℃, the short response/recovery time of 40/45 s, and the low detection limit of 0.1 ppm (1.18). It also has the reliable NO selectivity against to other interfering gases, good repeatability and high stability. Its enhanced NO-sensing performance may be due to the optimization of pore structure by adjusting the calcination process based on particles adhesion and mass transfer, which increases the pore size and specific surface area that could provide the channel and active sites for gas diffusion and adsorption, thus further promoting the gas-sensing reaction. The experimental methods and ideas of pore structure regulation provide a new way for the design of high-performance sensitive materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·Vol. 31
·期 8
·2099-2102
·
IF 3.839
Xin Yu,Ding Wang,Yuqiu Wang,Ji Yan,Xianying Wang
In this work, the two-dimensional MoS 2 film was prepared by sulfuring the molybdenum atomic layer on SiO 2 /Si substrate. The reaction temperature, heating rate, holding time and carrier gas flow rate were investigated comprehensively. The quality of MoS 2 film was characterized by optical microscopy, atomic force microscopy, Raman and photoluminescence spectroscopy. The characterization results showed that the optimum synthesis parameters were heating rate of 25 °C/min, reaction temperature of 750 °C, holding time of 30 min and carrier gas velocity of 100 sccm. The MoS 2 gas sensor was fabricated and its gas sensing performance was tested. The test results indicated that the sensor had a good response to both reducing gas (NH 3 ) and oxidizing gas (NO 2 ) at room temperature. The sensitivity to 100 ppm of NO 2 was 31.3%, and the response/recovery times were 4 s and 5 s, respectively. In addition, the limit of detection could be as low as 1 ppm. This work helps us to develop low power and integrable room temperature NO 2 sensors.
研究领域:
材料科学
·
纳米科技
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传感器技术
·
环境监测
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Xiang Jincheng,Zhang Zhengxin,Li Xiang,Yang Li,Guo Shenghui,Xia Yi
The detection of nitrogen dioxide (NO₂) at room temperature is crucial for environmental monitoring and public health, but achieving high sensitivity and selectivity remains a challenge. In this study, we developed an In₂O₃/MoS₂ gas sensor via the electrostatic self-assembly method for NO₂ sensing. Owing to the addition of MoS 2 , the composite sensitive materials obtained an increased the specific surface area and improved charge transfer ability. Therefore, the In₂O₃/MoS₂ compsites exhibited enhanced NO₂ sensing performance compared to the pure In₂O₃ nanoparticles.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）