Surface Enhancement Effects of Tiny SnO2 Nanoparticle Modification on & alpha;-Fe2O3 for Room-Temperature NH3 Sensing

文献类型： 外文期刊

第一作者： Xu, Lijia

作者： Xu, Lijia;Lin, Zhicheng;Xiong, XingYao;Cheng, Huan;Kang, ZhiLiang;Wang, Yuchao;Wu, Zhijun;Zou, Zhiyong;Liu, Mingdan;Zhao, Yongpeng;Ma, Wei;Yang, Ning;He, Yong;Li, Jianlong;Kou, Xin

作者机构：

期刊名称：INORGANIC CHEMISTRY （ 影响因子：4.6； 五年影响因子：4.4 ）

ISSN： 0020-1669

年卷期： 2023 年 62 卷 33 期

页码：

收录情况： SCI

摘要： The development of a gas sensor capable of detectingammonia withhigh selectivity and rapid response at room temperature has consistentlyposed a formidable challenge. To address this issue, the present studyutilized a one-step solvothermal method to co-assemble & alpha;-Fe2O3 and SnO2 by evenly covering SnO2 nanoparticles on the surface of & alpha;-Fe2O3. By controlling the morphology and Fe/Sn mole ratio of thecomposite, the as-prepared sample exhibits high-performance detectionof NH3. At room temperature conditions, a gas sensor composedof & alpha;-Fe2O3@3%SnO2 demonstratesa rapid response time of 14 s and a notable sensitivity of 83.9% whendetecting 100 ppm ammonia. Experiments and density functional theory(DFT) calculations suggest that the adsorption capacity of & alpha;-Fe2O3 to ammonia is enhanced by the surface effectprovided by SnO2. Meanwhile, the existence of SnO2 tailors the pore structure and effective surface area of & alpha;-Fe2O3, creating multiple channels for the diffusionand adsorption of ammonia molecules. Additionally, an N-N heterostructureis formed between & alpha;-Fe2O3 and SnO2, which enhances the potential energy barrier and improvesthe ammonia sensing performance. Demonstration experiments have provedthat the sensor shows significant advantages over commercial sensorsin the process of ammonia detection in agricultural facilities. Thiswork provides new insights into the perspectives on ammonia detectionat room temperature. Herein,an & alpha;-Fe2O3@SnO2 composite materialwas synthesized by a one-step solvothermal method,which effectively detected ammonia at room temperature. The as-obtainedsensor has a fast response (14 s) and high sensitivity (83.9%) ammoniasensing performance at room temperature. The improvement in sensorperformance can mainly be attributed to the chemical sensitizationand electronic sensitization brought about by the introduction oftiny SnO2.

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