NiO nanoparticles-decorated ZnO hierarchical structures for isopropanol gas sensing  

作　　者：Shi-Chao Wang Xiao-Hu Wang Gao-Qun Qiao Xiao-Yan Chen Xin-Zhen Wang Nan-Nan Wu Jian Tian Hong-Zhi Cui 

机构地区：[1]School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China

出　　处：《Rare Metals》2022年第3期960-971,共12页稀有金属（英文版）

基　　金：financially supported by the Distinguished Taishan Scholars in Climbing Plan (No. tspd20161006);the Major-Special Science and Technology Projects in Shandong Province(Nos.2019JZZY010303 and 2019JZZY010360);Shandong Provincial Natural Science Foundation (No. ZR2019MEM049)。

摘　　要：In this paper,a three-dimensional(3D)hierar-chical ZnO structure consisting of nanosheets modified with ultrafine NiO particles was synthesized via a facile two-step chemical precipitate method.Various techniques characterized the as-synthesized ZnO/NiO composites and pure ZnO.The p-NiO/n-ZnO junctions formed between adjacent ZnO and NiO nanoparticles,improving the gas sensing performance.The ZnO/NiO composite with the Ni:Zn atomic ratio of 7.42:100 exhibited the best iso-propanol sensing properties.Compared to pure ZnO,it showed high selectivity and sensitivity(R_(a)/R_(g)=221.3 toward 400×10^(-6)isopropanol),fast response rate(less than 10 s),short recovery time,and simultaneously low operating temperature.Also,the ZnO/NiO composite exhibited a wide sensing range(1×10^(-6)-1000×10^(-6))to isopropanol and processed good long-term stability.The experimental results suggested the potential application in fabricating efficient isopropanol sensors using this ZnO/NiO composite.The enhanced isopropanol sensing mech-anism is also discussed in charge transfer between heterojunctions,surface area,and surface defects.

关 键 词：ZNO NIO Hierarchical structure Gas sensor ISOPROPANOL 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TQ223.123[自动化与计算机技术—控制科学与工程] TB332[化学工程—有机化工]