Direct growth of ZnO nanodisk networks with an exposed (0001) facet on Au comb-shaped interdigitating electrodes and the enhanced gas-sensing property of polar {0001} surfaces

作者：Zhao, Qing; Shen, Qiong; Yang, Fan; Zhao, Hua; Liu, Bin; Liang, Qian; Wei, Aihua; Yang, Heqing^*; Liu, Shengzhong

来源：Sensors and Actuators B: Chemical , 2014, 195: 71-79.

DOI：10.1016/j.snb.2014.01.001

• ZnO nanodisk networks
• Au comb-shaped interdigitating electrodes
• Gas sensing property
• {0001} facets

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 center dot 4H(2)O at 450 degrees C in air. The nanodisk has hexagonal shape with a side length of similar to 1.8 mu m, a diagonal of similar to 3.8 mu m and thickness 64-125 nm. It grows mainly along < 0 1 (1) over bar 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 {0 1 (1) over bar 0} facets. The sensor response measured at 300 degrees 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 {1 0 (1) over bar 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.

• 出版日期2014-5
• 单位陕西师范大学