Enhanced NO2 gas sensing properties based on Rb-doped hierarchical flower-like In2O3 microspheres at low temperature
Enhanced NO2 gas sensing properties based on Rb-doped hierarchical flower-like In2O3 microspheres at low temperature
复制标题
基于 Rb 掺杂分级花状 In2O3 微球增强的低温 NO2 气体传感性能
DOI：
10.1016/j.snb.2021.129497
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发表时间：
2021-04
期刊：
影响因子：
--
通讯作者：
Gao Xiang
中科院分区：
文献类型：
--
作者：
Wang Yongguang;Yao Longchao;Xu Linjie;Wu Weihong;Lin Wenhao;Zheng Chenghang;Feng Yuanqun;Gao Xiang
本工作采用简单的一步溶剂热法和后续的热处理方法合成了Rb掺杂的分级花状In_2O_3微球。用X射线衍射仪、场发射扫描电子显微镜、透射电子显微镜和X射线光电子能谱对样品的形貌和结构进行了表征。制备了纯In_2O_3和Rb掺杂In_2O_3气敏元件，并对其气敏特性进行了系统的研究。基于1 摩尔%Rb掺杂的In_2O_3传感器在75 °C下对5 ppm的NO2表现出超高的响应(Rg/Ra=150 2)，是纯In_2O_3的2倍以上。此外，传感器对低至ppb级(Rg/Ra = 10.2-100 ppb)的NO2表现出良好的响应，理论检测下限为3.5ppb，高选择性和可靠的重复性。NO2气敏性能的优良和增强主要是由于其高比表面积、新颖的分级结构和Rb掺杂导致的表面化学吸附氧种的增加。
In this work, Rb-doped hierarchical flower-like In2O3microspheres were synthesized via a facile one-step solvothermal method along with the subsequent thermal treatment. The morphology and structure of the as-synthesized samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Gas sensors based on the pure and Rb-doped In2O3were fabricated and their gas sensing properties were systematically investigated. The sensors based on 1 mol% Rb-doped In2O3exhibited ultrahigh response (Rg/Ra = 1502) to 5 ppm NO2at 75 °C, which was over 2 times higher than that of pure In2O3. Moreover, the sensors showed good response towards NO2down to ppb level (Rg/Ra = 10.2–100 ppb), a very low theoretical detection limit of 3.5 ppb, high selectivity and reliable repeatability. The excellent and enhanced NO2gas sensing properties were mainly owing to its high specific surface area, novel hierarchical structure and increased surface chemisorbed oxygen species induced by Rb doping.
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