材料科学
纳米颗粒
扫描电子显微镜
X射线光电子能谱
透射电子显微镜
化学工程
锌
微观结构
煅烧
纳米技术
分析化学(期刊)
化学
催化作用
复合材料
冶金
色谱法
生物化学
工程类
作者
Shuo Wang,Fuchao Jia,Xiaomei Wang,Leqi Hu,Yuping Sun,Guangchao Yin,Tong Zhou,Zhenyu Feng,Parveen Kumar,Bo Liu
出处
期刊:ACS omega
[American Chemical Society]
日期:2020-03-02
卷期号:5 (10): 5209-5218
被引量:74
标识
DOI:10.1021/acsomega.9b04243
摘要
Zinc oxide (ZnO) nanoparticles modified with uniformly dispersed silver (Ag) nanoparticles (Ag-ZnO) were prepared in one step by calcining precursor electrospun nanofibers. The molar ratios of Ag to Zn in the precursor solutions were 0, 1, 3, and 5%. The microstructure of the Ag-ZnO sensor was characterized by scanning electron microscopy and transmission electron microscopy. The existence of metallic Ag was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy, and the gas sensing properties of Ag-ZnO were investigated. The results showed that the ZnO nanoparticles after Ag nanoparticles modification exhibited excellent gas sensing performance to ethanol and hydrogen sulfide (H2S). The optimal working temperature of the Ag-ZnO sensor significantly decreased for ethanol compared with pure ZnO. The 3% Ag-ZnO sensor exhibited the fastest response to ethanol with the response/recovery times of only 5 and 9 s, respectively. However, all the Ag-ZnO-based gas sensors showed a high response value to H2S, especially the 3% Ag-ZnO gas sensor exhibited a maximum response value of 298 at 10 ppm H2S. These results could be attributed to the spillover effect and electron sensitization effect of Ag nanoparticles, which led to more absorbed oxygen species and active sites, and thereby can further enhance the gas sensing performances of ZnO-based gas sensors.
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