ZnO nanoflowers modified with RuO2 for enhancing acetone sensing performance. (23rd December 2019)

• Record Type: Journal Article
• Authors: Zhang, Shendan; Wang, Chenhao; Qu, Fengdong; Liu, Siqi; Lin, Cheng-Te; Du, Shiyu; Chen, Yousi; Meng, Fanli; Yang, Minghui
• Is Part Of: Nanotechnology. Volume 31:Number 11(2020)
• Publication Date: 2019-12-23
• Subjects: ZnO nanoflowers -- RuO2 -- surface modification -- gas sensors -- acetone; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ab5cd9
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Surface modification is a simple and effective means to promote the sensing performance of metal oxide semiconductor-based gas sensors. Marigold-shaped ZnO nanoflowers are fabricated via a simple precipitation reaction and subsequently catalytically modified with RuO2 on the surface through an ethylene glycol solvothermal treatment. The experimental results have proven that a very low content of Ru on the surface of ZnO exists in an oxidized state. However, the gas response of the sensor based on RuO2 -modified ZnO is remarkably improved by 17 times to 100 ppm acetone with the decrease of optimal operating temperature from 219 °C–172 °C and reduction in recovery time from 79–52 s. The sensing enhancement mechanism of surface modification can be attributed to the formation of massive small heterostructure between p-type RuO2 ultrasmall nanoparticles and n-type ZnO as well as the catalytic effect of Ru 4+ and a rougher surface.