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基于LaCoO_(3)/SnO_(2)纳米材料的异质结型乙醇气体传感器研究

Heterojunction ethanol gas sensor based on LaCoO_(3)/SnO_(2) nanomaterials
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摘要 采用水热法制备了SnO_(2)纳米颗粒,利用溶胶-凝胶法成功合成了LaCoO_(3)和LaCoO_(3)/SnO_(2)纳米颗粒。以氧化铝陶瓷管为基体,SnO_(2)和LaCoO_(3)/SnO_(2)纳米颗粒为敏感材料,研制了一种用于快速检测乙醇气体的传感器件。采用XRD、BET和XPS等表征技术,分析LaCoO_(3)、SnO_(2)和LaCoO_(3)/SnO_(2)的微观结构和元素组成。从LaCoO_(3)和SnO_(2)的能带结构角度,解释了异质结LaCoO_(3)/SnO_(2)对乙醇气敏的增强机制。与SnO_(2)传感器相比,LaCoO_(3)/SnO_(2)在气敏响应、响应时间和选择性等方面均有显著改善。在最佳工作温度250℃下,LaCoO_(3)/SnO_(2)对乙醇气体(20μg/m^(3))响应为90.3,响应时间和恢复时间分别为6.5、10.2 s,最小检出限值为2.0μg/m^(3),显示出良好的气敏性、选择性和抗干扰性。LaCoO_(3)/SnO_(2)气敏性能提升原因是LaCoO_(3)引入形成的异质结及较大的比表面积。 SnO_(2) nanoparticles were prepared using a hydrothermal method,and LaCoO_(3) and LaCoO_3/SnO_(2) nanoparticles were successfully synthesized using the sol-gel method.A sensor device for the rapid detection of ethanol gas was developed using alumina ceramic tubes as substrates and SnO_(2) and LaCoO_(3)/SnO_(2) nanoparticles as sensing materials.Characterization techniques such as XRD,BET,and XPS were used to analyze the microstructure and elemental composition of LaCoO_(3),SnO_(2),and LaCoO_(3)/SnO_(2).The enhancement mechanism of the heterojunction LaCoO_(3)/SnO_(2) for ethanol gas sensitivity was explained from the perspective of the energy band structure of LaCoO_(3) and SnO_(2).Compared to the SnO_(2) sensor,LaCoO_3/SnO_(2) showed significant improvements in gas sensitivity response,response time,and selectivity.At the optimal working temperature of 250 ℃,the response of LaCoO_(3)/SnO_(2) to ethanol gas(20 μg/m^(3)) was 90.3,with response and recovery time of 6.5 s and 10.2 s respectively,and a minimum detection limit of 2.0 μg/m^(3),demonstrating good gas sensitivity,selectivity,and anti-interference performance.The enhancement of gas sensing performance of LaCoO_(3)/SnO_(2) is attributed to the heterojunction formed by LaCoO_(3) and its larger specific surface area.
作者 胡明江 王旭荣 帅行明 张一路 HU Ming-jiang;WANG Xu-rong;SHUAI Xing-ming;ZHANG Yi-lu(School of Energy&Building Environmental Engineering,Henan University of Urban Construction,Pingdingshan 467036,China;School of International Education,Henan University of Urban Construction,Pingdingshan 467036,China;Department of Food Engineering,Luohe Vocational Technology College,Luohe 462000,China)
出处 《河南城建学院学报》 CAS 2024年第6期121-127,共7页 Journal of Henan University of Urban Construction
基金 国家自然科学基金青年科学基金项目(52106006) 河南省高等学校重点科研项目计划(25B470009)。
关键词 传感器 异质结 钴酸镧 二氧化锡 纳米材料 乙醇 敏感机理 sensor heterojunction lanthanum cobaltite tin dioxide nanomaterials ethanol sensitivity mechanism
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