Highly Sensitive Ethanol Gas Sensor Using Pyramid-Shaped ZnO Particles with (0001) Basal Plane
Highly Sensitive Ethanol Gas Sensor Using Pyramid-Shaped ZnO Particles with (0001) Basal Plane
复制标题
DOI：
10.1021/acs.jpcc.8b01936
复制
发表时间：
2018-04-05
影响因子：
3.7
通讯作者：
Shimanoe, Kengo
中科院分区：
文献类型：
--
作者：
Saito, Noriko;Watanabe, Ken;Shimanoe, Kengo
在空气质量监测和医疗诊断中，需要具有高灵敏度的金属氧化物半导体颗粒来检测少量气体。在此，我们报道了对乙醇气体具有极高灵敏度的氧化锌金字塔形颗粒的制备。以醋酸锌、六亚甲基四胺、乙二醇和水为溶剂，在溶剂热条件下合成了氧化锌金字塔状颗粒。气敏响应以氧化锌颗粒层在空气和乙醇中的电阻之比来评价。溶剂热过程中的搅拌导致了金字塔状颗粒的分散，而不是球形聚集体。透射电子显微镜研究表明，金字塔状颗粒的底面为(0001)面，六个侧面为{10(11)Over bar}面。对SOppm乙醇气体的最高气敏响应值约为10000，显著高于已报道的氧化锌颗粒的气敏响应值。讨论了晶面和极性的影响。
For monitoring of air quality and medical diagnosis, metal-oxide-semiconductor particles with high sensitivity to detect small amount of gases are desirable. Herein, we report the fabrication of ZnO pyramid-shaped particles with remarkably high sensitivity to ethanol gas. The ZnO pyramid-shaped particles were synthesized solvothermally under agitation from the solution of zinc acetate anhydride, hexamethylenetetramine, ethylene glycol, and water. Gas sensing response was evaluated as the ratio of electrical resistance of the ZnO particulate layer in air to that in ethanol. The agitation during the solvothermal process resulted in dispersion of the pyramid shaped particles rather than spherical aggregates. TEM studies revealed that the base of the pyramid-shaped particles is the (0001) plane and that the six side surfaces are the {10 (11) over bar} plane. The highest gas sensing response value to SO ppm ethanol gas was about 10 000, which is remarkably higher than that of previously reported ZnO particles. The influence of the crystal facets and the polarity is discussed.