SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Weiwei Meng,Lei Dai,Wei Meng,Huizhu Zhou,Yuehua Li,Zhangxing He,Ling Wang
Mixed-potential type NH 3 sensors were fabricated using La 10 Si 5.5 Al 0.5 O 27 (LSAO) consisting of a porous layer and a dense layer as solid electrolyte and TiO 2 as the sensing electrode. The effect of a LSAO porous layer and TiO 2 phase transformation on sensor performances was investigated. The porous layer of LSAO electrolyte obviously enhanced sensor performance. Compared with the sensor without a LSAO porous layer, the sensor with LSAO porous layer exhibited larger responding potential values and higher sensitivity due to the enhanced three phase interface length. Anatase-TiO 2 (a-TiO 2 ) based sensor exhibited better sensing performance than rutile-TiO 2 (r-TiO 2 ) based sensor at the examined temperature range. A-TiO 2 transformation toward r-TiO 2 resulted in poor sensing performances of the sensor. The best sensing characteristics were achieved for the NH 3 sensor with a-TiO 2 sensing electrode calcined at 900 °C for 3 h. The potential values of the sensor response to NH 3 linearly depended on the logarithm of NH 3 concentrations at 450–600 °C and the sensitivity reached 169.7 mV/decade in the range of 50–400 ppm at 500 °C. At the same time, the sensor exhibited well anti-interference capability to H 2 , NO, CH 4 and CO 2 , but a little cross-sensitivity toward NO 2 was observed. High temperature treatment (>900 °C) caused a-TiO 2 transformation into r-TiO 2 and V 2 O 5 additions were conducive to TiO 2 phase transformation.
研究领域:
材料科学
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传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS-CONDENSED MATTER
·
2022
·Vol. 34
·期 37
·374002
·
IF 2.745
Xiao Chang,Xiaofang Li,Qingzhong Xue
Exploring novel NH3 sensing materials is crucial in chemical industries, fertilizing plants and medical fields. Herein, for the first time, the NH3 sensing behaviors and sensing mechanisms of two dimensional (2D) ZnTe monolayer are systematically investigated by density functional theory calculations. It is shown that 2D ZnTe monolayer exhibits excellent selective NH3 sensing properties. (220) crystal facet of ZnTe possesses a higher NH3 adsorption energy (−1.59 eV) and a larger charge transfer (0.195e) than (111) and (311) crystal facets. The positive charges could enhance NH3 sensing while the negative charges could reduce NH3 sensing. The NH3 adsorption strengths are significantly improved in O2 atmosphere while it is negligibly affected by N2 atmosphere and H2O atmosphere. Moreover, the presence of Zn vacancy and Fe, Co, Ni doping could improve the NH3 sensing of ZnTe. Additionally, the experimental results confirms that ZnTe possesses a low detection limit of 0.1 ppm NH3. These theoretical predictions and experimental results present a wide range of possibilities for the further development of ZnTe monolayer in NH3 sensing fields.
研究领域:
材料科学
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化学传感器
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理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Weiwei Meng,Ling Wang,Huizhu Zhou,Yongguang Liu,Lei Dai
Impedimetric NH 3 sensors using Yttria-stabilized zirconia (YSZ) as solid electrolyte and spinel-type oxide as sensing electrode (SE) were fabricated. Phase angle (θ) was employed as response signals to evaluate their sensing performance, as a comparison, modulus value (|Z|) response was also examined. The SE materials with nanostructure were in-situ introduced into the YSZ porous skeleton by impregnation technique. A series of spinel-type oxide MFe 2 O 4 (M = Ni, Zn and Co) were examined, and among these oxides, NiFe 2 O 4 was found to be the most excellent SE for NH 3 sensor. Sensing performance of the sensor was optimized by adjusting the loading amount and calcination temperature of the sensing material NiFe 2 O 4 and the sensor exhibits the best performance when the loading amount is 0.585 mg and the calcination temperature is 800 °C. Sensing performance of the sensor was tested in 50−1000 ppm NH 3 with temperature varying from 400 to 650 °C. Compared with modulus value (|Z|), θ as response signal improves sensing performance of NH 3 sensor. The sensor exhibits short recovery time, high sensitivity and reproducible response at 600 °C. The sensor has good anti-interference capability to CO 2 , CH 4 , H 2 , NO 2 and NO, but O 2 and relative humidity (RH) have a certain effect on sensing performance.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yu Zhang,Yongguang Liu,Ling Wang,Huizhu Zhou,Weiwei Meng,Yuehua Li,Zhangxing He,Lei Dai
Spinel oxide Zn 2 SnO 4 with cubic structure was synthesized by solid state reaction method. A NH 3 sensor based on mixed potential mechanism were fabricated with 8% yttria stabilized zirconia electrolyte with bi-layered and Zn 2 SnO 4 sensing electrode (SE). The influence of Zn 2 SnO 4 -SE thickness and sintering temperature on the response performance of the sensor was evaluated. The results display that the sensor using Zn 2 SnO 4 -SE with a thickness of 17 µm and sintered at 1100 °C displays better performance, which is closely related to the microstructure of the Zn 2 SnO 4 -SE. The response signals are linearly related to the logarithm of the NH 3 concentrations over the operating temperature range and at 600 °C the sensor shows the highest sensitivity of − 61.8 mV/decade. The cross-sensitivity experiment results show that the cross-sensitivity of the sensor towards CO 2 and H 2 is hardly observed; the NH 3 sensitivity decreases with the increasing of O 2 content to some extent; relative humidity and NO or NO 2 cause serious interference. In order to eliminate NO or NO 2 interference, CuO was chosen to replace Pt as the reference electrode, and the results show that the cross-sensitivity of the sensor to NO or NO 2 was significantly reduced, but the sensitivity slightly decreases. The sensor also shows a relatively good long-term stability. The polarization curve and Tafel plots verify that the sensor complies with mixed potential model.
研究领域:
传感器学
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材料科学
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分析化学
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环境监测
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气体传感
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 9
·1-12
·
IF 5.3
Han Yiming,Hao Shuai,Liu Lihong,Li Bo,Mu Yannan,Yang Ming,Zhang Jie
The development of NH 3 sensors with efficient room temperature detection is crucial for Internet of Things-driven smart agriculture. Herein, PANI/SnO 2 hollow nanospheres composites were in situ synthesized on flexible interdigital electrodes (PET-IDE). Within the PANI/SnO 2 composites microstructure, the SnO 2 hollow spheres can provide effective support to the PANI film, minimize agglomeration, and enhance the functional performance of PANI. Furthermore, the extensive interface between the SnO 2 hollow spheres and the PANI film promotes the creation of p-n heterojunction, thereby significantly improving the NH 3 gas-sensing performance. The 4PS-based sensor (the PANI/SnO 2 composite obtained at 0.04 mol·L −1 APS/HCl solutions) exhibited a high response (9.63) toward 100 ppm NH 3 , along with excellent selectivity and stability. Correlations between microstructure and NH 3 gas-sensing behavior were systematically investigated, offering theoretical insights for sensor optimization. Graphical
研究领域:
材料科学
·
化学传感器
·
纳米技术
·
柔性电子学
·
环境监测
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）