Gas sensing enhancement of aluminum-doped ZnO nanovase structure with many gas facile diffusivity paths
Gas sensing enhancement of aluminum-doped ZnO nanovase structure with many gas facile diffusivity paths
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DOI：
10.1016/j.apsusc.2012.10.144
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发表时间：
2013-01
影响因子：
6.7
通讯作者：
Ling-min Yu;Xin-hui Fan;C. Lei;L. Qi;Y. Wen
中科院分区：
文献类型：
--
作者：
Ling-min Yu;Xin-hui Fan;C. Lei;L. Qi;Y. Wen
采用热蒸发法制备了升温速度快的Al掺杂氧化锌纳米晶结构。发现有大量的纳米晶结构，其顶部有一个大的孔径，许多短的纳米棒从它们的表面生长出来，形成足够多的孔或通道，足以使气体从表面快速扩散到纳米晶的内部。利用Al掺杂的氧化锌纳米结构制作了气敏元件，检测了气敏元件对500ppm的C2H5OH、CO、NH3和CH4气体的响应。掺铝氧化锌纳米晶对乙醇的响应和选择性在300℃时高达34.1。这些结果表明，铝掺杂氧化锌纳米晶由于其独特的结构显著地促进了气体在传感材料中的扩散和传质，因此在乙醇传感器中具有很好的应用前景。
Al-doped ZnO nanovase structures were synthesized by thermal evaporation method with a fast temperature rise speed. It was found that there were a good amount of nanovase structures with a large aperture on the top of it and many short nanorods grew from their surface to generate many holes or channels enough for gas to quickly diffuse from surface to the inside of nanovase. Gas sensors were fabricated using the Al-doped ZnO nanostructures to examine the responses to 500ppm C2H5OH, CO, NH3, and CH4gases. The Al-doped ZnO nanovases exhibited a better response and selectivity toward ethanol as high as 34.1 at 300°C. These results showed that Al-doped ZnO nanovases are highly promising for ethanol sensor applications, as the gas diffusion and mass transportation in sensing materials are significantly enhanced by their unique structures.