Adsorption-controlled transition of the electrical properties realized in Hematite (alpha-Fe2O3) nanorods ethanol sensing

被引：8

作者：

Wang Chong ^{[1
]}

Wang Fei-Fei ^{[2
]}

Fu Xing-Qiu ^{[3
]}

Zhang En-Di ^{[4
]}

Xu Zhi ^{[4
]}

机构：

[1] Yantai Univ, Sch Optoelect Informat Sci & Technol, Yantai 264005, Peoples R China

[2] Ludong Univ, Sch Phys, Yantai 264025, Peoples R China

[3] N China Elect Power Univ, Dept Math & Phys, Beijing 102206, Peoples R China

[4] Hunan Univ, Micronano Technol Res Ctr, Changsha 410082, Hunan, Peoples R China

来源：

CHINESE PHYSICS B | 2011年 / 20卷 / 05期

基金：

中国国家自然科学基金;

关键词：

adsorption; sensing; depletion; oxygen; ZNO NANORODS; CONDUCTIVITY; HYDROLYSIS; SURFACE; OXIDES; H2S;

D O I：

10.1088/1674-1056/20/5/050701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Alpha-Fe2O3 nanorods are synthesized through a hydrothermal method with no surfactant introduced and ethanol sensors are fabricated from these nanorods. The device can respond to ethanol vapour in a concentration range from 1 to 1500 parts per million and shows both p-type and n-type responding characteristics during the investigation of the ethanol sensing. The sensor displays a p-type characteristic when the ethanol concentration is low and converted into an n-type characteristic as the concentration exceeds a certain value. Such a phenomenon is attributed to the chemisorbed oxygen, which leads to different modifications of the energy band at the surface, namely, depletion layer or inversion layer.

引用

页数：5

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