Wang Shuo, Jia Fuchao, Wang Xiaomei, Hu Leqi, Sun Yuping, Yin Guangchao, Zhou Tong, Feng Zhenyu, Kumar Parveen, Liu Bo
School of Material Science and Engineering, Shandong University of Technology, Zibo, Shandong 255000, China.
Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, Shandong 255000, China.
ACS Omega. 2020 Mar 2;5(10):5209-5218. doi: 10.1021/acsomega.9b04243. eCollection 2020 Mar 17.
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 (HS). 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 HS, especially the 3% Ag-ZnO gas sensor exhibited a maximum response value of 298 at 10 ppm HS. 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.
通过煅烧前驱体电纺纳米纤维一步法制备了均匀分散的银（Ag）纳米颗粒修饰的氧化锌（ZnO）纳米颗粒（Ag-ZnO）。前驱体溶液中Ag与Zn的摩尔比分别为0、1、3和5%。采用扫描电子显微镜和透射电子显微镜对Ag-ZnO传感器的微观结构进行了表征。通过X射线衍射和X射线光电子能谱证实了金属Ag的存在，并研究了Ag-ZnO的气敏性能。结果表明，Ag纳米颗粒修饰后的ZnO纳米颗粒对乙醇和硫化氢（HS）表现出优异的气敏性能。与纯ZnO相比，Ag-ZnO传感器对乙醇的最佳工作温度显著降低。3%Ag-ZnO传感器对乙醇的响应最快，响应/恢复时间分别仅为5和9 s。然而，所有基于Ag-ZnO的气体传感器对HS都表现出较高的响应值，尤其是3%Ag-ZnO气体传感器在10 ppm HS下表现出298的最大响应值。这些结果可归因于Ag纳米颗粒的溢出效应和电子敏化效应，这导致了更多的吸附氧物种和活性位点，从而可以进一步提高基于ZnO的气体传感器的气敏性能。
