Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7147074 | Sensors and Actuators B: Chemical | 2014 | 9 Pages |
Abstract
ZnO nanodisk networks were grown directly on Au comb-shaped interdigitating electrodes on SiO2/Si substrate by thermal evaporation of a mixture of ZnCl2 and InCl3·4H2O at 450 °C in air. The nanodisk has hexagonal shape with a side length of â¼1.8 μm, a diagonal of â¼3.8 μm and thickness 64-125 nm. It grows mainly along 011¯0 directions, and is enclosed by ±(0 0 0 1) top and bottom surfaces. The as-prepared ZnO nanodisks having mostly {0 0 0 1} facets exhibit better gas-sensing performance for NH3, N(C2H5)3 and C2H5OH comparing to ZnO nanorods with 011¯0 facets. The sensor response measured at 300 °C are 1.68, 11.84 and 10.19 for NH3, N(C2H5)3 and C2H5OH with concentration 5, 10 and 10 ppm, respectively. The enhancement in the gas-sensing properties is mainly attributed to the exposed {0 0 0 1} facets which provide more active sites for oxygen adsorption and subsequent reaction with the vapor than 101¯0 facets, and therefore improved response. The observation motivates us to further explore new synthetic methods to prepare other metal oxides with a high percentage of reactive facets with potential applications in gas sensors, photocatalysts, solar cells, and optoelectronic devices.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Qing Zhao, Qiong Shen, Fan Yang, Hua Zhao, Bin Liu, Qian Liang, Aihua Wei, Heqing Yang, Shengzhong Liu,