A low temperature formaldehyde gas sensor based on hierarchical SnO/SnO2 nano-flowers assembled from ultrathin nanosheets: Synthesis, sensing performance and mechanism
A low temperature formaldehyde gas sensor based on hierarchical SnO/SnO2 nano-flowers assembled from ultrathin nanosheets: Synthesis, sensing performance and mechanism
复制标题
基于超薄纳米片组装的分级 SnO/SnO2 纳米花的低温甲醛气体传感器：合成、传感性能和机理
DOI：
10.1016/j.snb.2019.04.061
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发表时间：
2019-09-01
影响因子：
8.4
通讯作者：
Xu, Jiaqiang
中科院分区：
文献类型：
--
作者：
Li, Na;Fan, Yu;Xu, Jiaqiang
本文报道了一种用于检测低温甲醛蒸气的分级花状SnO/SnO2气敏材料。通过合理的设计，采用一步水热法成功合成了该化合物。用X射线衍射仪、扫描电子显微镜、透射电子显微镜、拉曼光谱、荧光光谱和X射线光电子能谱对样品的晶相、缺陷、元素组成和形貌进行了详细的表征。表征结果表明，SnO/SnO2纳米花是由厚度约为9-11 nm的超薄纳米片组装而成的。气敏性能表明，基于SnO/SnO2纳米花的气敏传感器具有工作温度低(120℃)、选择性好、响应时间短(S 7)、响应值高(80.9)和检测限低(8.15 ppb)等优点。该传感器良好的气体响应特性归功于其独特的层次化微结构(R-g减小，R-a增大)和SnO与SnO2之间的p-n结(增大R-a)。最后，对所制备的材料的传感机理进行了详细的阐述。
Here we report a hierarchical flower-like SnO/SnO2 gas sensing material for detecting formaldehyde vapor at a low temperature. It was rationally designed and successfully synthesized via a one-step hydrothermal route. The crystal phase, defects, element composition and morphology of the obtained samples were characterized in detail by XRD, FESEM, TEM, Raman, PL, and XPS. The characterized results reveal that hierarchical SnO/SnO2 nano-flowers are assembled from ultrathin nanosheets with about 9-11 nm in thickness. Gas sensing performance shows that the sensor based on SnO/SnO2 nano-flowers has crucial advantages for formaldehyde detection, such as low operating temperature (120 degrees C), excellent selectivity, short response time (7 s), high response value (80.9) and low detection limitation (8.15 ppb). The excellent gas responses of the sensor can be attributed to its unique hierarchical microstructure (for decrease of R-g and increase of R-a) and p-n junction between SnO and SnO2 (for increase of R-a). Finally, the sensing mechanism of the prepared was proposed in detail.