基于LaFe1-xPdxO3纳米纤维的三明治结构甲苯传感器研究

引用本文: 胡明江, 刘海燕, 吕春旺, 赵丽霞, 张志远. 基于LaFe_1-xPd_xO₃纳米纤维的三明治结构甲苯传感器研究[J]. 分析化学, 2020, 48(1): 66-73. doi: 10.19756/j.issn.0253-3820.191281 shu

Citation: HU Ming-Jiang, LIU Hai-Yan, LYU Chun-Wang, ZHAO Li-Xia, ZHANG Zhi-Yuan. Study on Sandwich Structure Toluene Sensor Based on LaFe_1-xPd_xO₃ Nanofibers[J]. Chinese Journal of Analytical Chemistry, 2020, 48(1): 66-73. doi: 10.19756/j.issn.0253-3820.191281 shu

基于LaFe_1-xPd_xO₃纳米纤维的三明治结构甲苯传感器研究

1.
河南城建学院能源与建筑环境工程学院, 平顶山 467036;
2.
华北电力大学能源动力与机械工程学院, 保定 071003
基金项目:
本文系河南省自然科学基金项目（No.182300410264）、河南省科技攻关计划项目（No.182102210225）和河南省高等学校重点科研项目（No.18A470002）资助

摘要: 采用静电纺丝法制备了LaFe_1-xPd_xO₃（x=0、0.05、0.1和0.2）纳米纤维，均匀涂覆于刻有叉指铂金电极的硅基底表面形成敏感薄膜，设计了一种三明治结构甲苯传感器。采用X射线衍射仪、扫描电子显微镜和X-射线光电子能谱仪，表征了LaFe_1-xPd_xO₃纳米纤维的相组成和微观形貌，分析了LaFe_1-xPd_xO₃纳米纤维敏感机理和电化学特性，测试了甲苯传感器的灵敏特性、温度特性、动态响应和选择稳定性。结果表明，甲苯浓度在1.0-30.0 μg/m³范围内，传感器（LaFe_0.9Pd_0.1O₃）灵敏度与甲苯浓度呈良好的线性关系。当温度为200℃，甲苯浓度为30 μg/m³时，传感器响应为99.8，动态响应和恢复时间分别为3.8和1.8 s，对苯、二甲苯、乙醇、甲醛和丙酮等气体无明显响应。在汽车上连续使用50天后，传感器响应仅下降了0.3。

关键词:

钯
/ 钙钛矿
/ 纳米纤维
/ 传感器
/ 甲苯

English

Study on Sandwich Structure Toluene Sensor Based on LaFe_1-xPd_xO₃ Nanofibers

1.
School of Energy and Building Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036, China;
2.
School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Received Date: 15 May 2019
Revised Date: 28 October 2019
Fund Project:
This work was supported by the Natural Science Foundation of He'nan Province (No. 182300410264), the Science and Technology Foundation of He'nan Province (No.182102210225) and the Educational Commission of He'nan Province of China (No.18A470002)

Abstract: A new sandwich structure toluene gas sensor was designed by transferring LaFe_1-xPd_xO₃ nanofiber that was prepared by electrospinning method onto silicon substrate with platinum-inter digital electrodes by dip-coating method. The crystalline phase and microstructure of LaFe_1-xPd_xO₃ nanofibers were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Sensitive mechanism and electrochemical characteristic of LaFe_1-xPd_xO₃ nanofibers were analyzed by X-ray photoelectron spectroscopy (XPS). These characteristic tests for the toluene gas sensor were carried out to obtain the optimal sensitive performance, temperature, relative humidity, dynamic response, selectivity and stability. The result showed that the toluene gas sensor based on LaFe_0.9Pd_0.1O₃ nanofiber had a good linear relationship with toluene in the concentration range of 1.0-30 μg/m³ at operating temperature of 200℃. The dynamic response time and recover time of sensor to 30 μg/m³ toluene were 3.8 and 1.8 s, respectively. This kind of sensor showed good anti-disturbance to such gases as benzene, xylene, ethanol, formaldehyde and acetone. Besides, the toluene gas sensor response was attenuated only about 0.3, when it was applied continually on automobile about 50 days.

Key words:

Palladium
/ Perovskite
/ Nanofibers
/ Sensor
/ Toluene

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