Decoration of Co nanoparticles on ZnO-branched SnO2 nanowires to enhance gas sensing

被引：45

作者：

Kim, Hyoun Woo ^{[2
]}

Na, Han Gil ^{[2
]}

Kwon, Yong Jung ^{[2
]}

Cho, Hong Yeon ^{[2
]}

Lee, Chongmu ^{[1
]}

机构：

[1] Inha Univ, Sch Mat Sci & Engn, Inchon 402751, South Korea

[2] Hanyang Univ, Div Mat Sci & Engn, Seoul 133791, South Korea

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2015年 / 219卷

基金：

新加坡国家研究基金会;

关键词：

ZnO; Co nanoparticles; Chemical sensors; ZINC-OXIDE; ROOM-TEMPERATURE; FIELD-EMISSION; WORK FUNCTION; COBALT; FERROMAGNETISM; FABRICATION; OXIDATION;

D O I：

10.1016/j.snb.2015.05.017

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We sputtered zinc-oxide (ZnO)-branched tin oxide (SnO2) nanowires with a Co shell layer with subsequent annealing to produce cobalt (Co) nanoparticles on the ZnO branches. X-ray diffraction, selected area electron diffraction, and lattice-resolve TEM images showed that the nanoparticles corresponded to a hexagonal Co phase. We further studied the NO2 sensing performance of Co-decorated ZnO branched structures in the range of 2-10 ppm at 250 degrees C. Sensor characteristics were examined in terms of sensitivity (i.e., sensor response), response time, and recovery time; we further proposed the possible mechanisms of enhancement of sensing behavior by the attachment of Co nanoparticles. Co-functionalization enhanced the sensor response and significantly decreased the recovery times. The Co-decorated ZnO branched structures showed promising sensing performance toward NO2 gas at concentrations as low as 2 ppm. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：22 / 29

页数：8

共 37 条

[1] Effect of alumina doping on structural, electrical, and optical properties of sputtered ZnO thin films [J].