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
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 960-971
• 页数: 12页
• 语种: 英文

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(Ra/Rg=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.