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
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
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DOI：
10.1016/j.snb.2014.01.001
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发表时间：
2014-05
影响因子：
8.4
通讯作者：
Qing Zhao;Qiong Shen;Fan Yang;Hua Zhao;B. Liu;Qianxin Liang;A. Wei;Heqing Yang;S. Liu
中科院分区：
文献类型：
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作者：
Qing Zhao;Qiong Shen;Fan Yang;Hua Zhao;B. Liu;Qianxin Liang;A. Wei;Heqing Yang;S. Liu
在450℃的空气中，用ZnCl2和InCl3·4H2O的混合物热蒸发，直接在SiO_2/Si衬底上的Au梳状交错电极上生长出了ZnO纳米网络。该纳米盘为六角形，边长∼1.8μm，对角线∼3.8μm，厚度-125 nm。它主要沿0 1 1‘0方向生长，并被±(0 0 0 1)个顶面和底面包围。对于NH3、N(C2H5)3和C2H5OH，以{0 0 0 1}晶面为主的氧化锌纳米棒比具有0 1 1‘0晶面的氧化锌纳米棒具有更好的气敏性能。在300℃下对浓度为5、10和10ppm的NH3、N(C2H5)3和C2H5OH的传感器响应分别为1.68、11.84和10.19。气敏性能的提高主要归因于裸露的{0 0 0 1}面，它比1 0 1‘0面提供了更多的氧吸附和随后与蒸汽反应的活性中心，从而改善了响应。这一观察结果促使我们进一步探索新的合成方法，以制备具有高活性晶面比例的其他金属氧化物，在气体传感器、光催化剂、太阳能电池和光电子器件中具有潜在的应用前景。
ZnO nanodisk networks were grown directly on Au comb-shaped interdigitating electrodes on SiO 2/Si substrate by thermal evaporation of a mixture of ZnCl 2 and InCl 3· 4H 2 O at 450° C in air. The nanodisk has hexagonal shape with a side length of∼ 1.8 μm, a diagonal of∼ 3.8 μm and thickness 64-125 nm. It grows mainly along 0 1 1¯ 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 NH 3, N (C 2 H 5) 3 and C 2 H 5 OH comparing to ZnO nanorods with 0 1 1¯ 0 facets. The sensor response measured at 300° C are 1.68, 11.84 and 10.19 for NH 3, N (C 2 H 5) 3 and C 2 H 5 OH 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¯ 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.