Design of Au@WO3 core−shell structured nanospheres for ppb-level NO2 sensing
Design of Au@WO3 core−shell structured nanospheres for ppb-level NO2 sensing
复制标题
用于 ppb 级 NO2 传感的 Au@WO3 核壳结构纳米球的设计
DOI：
10.1016/j.snb.2018.11.142
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发表时间：
2019-03
期刊：
影响因子：
--
通讯作者：
Dezhou Wei
中科院分区：
文献类型：
--
作者：
Sikai Zhao;Yanbai Shen;Pengfei Zhou;Xiangxi Zhong;Cong Han;Qiang Zhao;Dezhou Wei
在高性能二氧化氮(NO2)传感器迫切需求的推动下，本工作设计并成功制备了一种新型结构的Au@WO_3核壳纳米球(CSNSS)用于检测NO2。用X射线衍射仪、场发射扫描电子显微镜、透射电子显微镜、X射线光电子能谱、Brunauer-Emmett-Teller测量和元素图谱分析等手段对样品进行了表征。结果表明，直径为25~50 nm的Au纳米粒子被厚度为30~50 nm的WO_3壳层成功包裹。系统地研究了Au@WO_3CSNSS和纯WO_3纳米球的NO2传感性能。与纯WO_3纳米球相比，Au@WO_3CNNSs在响应、检测下限和响应/恢复时间方面表现出全面增强的NO2传感性能。在100 °C的最佳操作温度下，Au@WO3CSNSS表现出良好的NO2选择性和长期稳定性。值得注意的是，Au@WO3CSNSS优良的NO2传感性能略受湿度的影响。讨论了Au@WO3CSNSs增强NO2传感性能的可能机理。
As motivated by the driving force of the urgent demand for high-performance nitrogen dioxide (NO2) sensor, in this work, a novel structure of Au@WO3core–shell nanospheres (CSNSs) was designed and successfully prepared for NO2detection. The techniques of X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller measurement, and elemental mapping analysis were used for the characterizations of the obtained samples. The results demonstrated that Au nanoparticles with 25–50 nm in diameter were successfully encapsulated by WO3shells with the thickness of 30–50 nm. The NO2sensing performance of the Au@WO3CSNSs as well as the pure WO3nanospheres were systematically investigated. Compared with the pure WO3nanospheres, Au@WO3CNNSs exhibited overall enhanced NO2sensing performances in terms of response, detection limit, and response/recovery times. At the optimal operating temperature of 100 °C, Au@WO3CSNSs showed excellent NO2selectivity and long-term stability. Notably, the excellent NO2sensing performance of Au@WO3CSNSs was slightly affected by humidity. The possible sensing mechanism of the enhanced NO2sensing properties of the Au@WO3CSNSs was discussed.
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