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
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
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纳米技术
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柔性电子学
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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）