Studies of influence of structural properties and thickness of NiO thin films on formaldehyde detection

被引：65

作者：

Castro-Hurtado, I. ^{[1
]}

Herran, J. ^{[1
]}

Mandayo, G. G. ^{[1
]}

Castano, E. ^{[1
]}

机构：

[1] Univ Navarra, CEIT, San Sebastian, Spain

来源：

THIN SOLID FILMS | 2011年 / 520卷 / 03期

关键词：

Gas sensor; Thickness influence; NiO; Formaldehyde; VOC; GAS SENSOR; ELECTROCHROMIC PROPERTIES; TEMPERATURE;

D O I：

10.1016/j.tsf.2011.04.180

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

The aim of the present work is to test the performance of nickel oxide (NiO) thin films to low concentrations of formaldehyde (HCHO). NiO thin films were deposited on alumina substrates by RF reactive magnetron sputtering in a mixed atmosphere of argon and oxygen. A Pt heating resistor was deposited on the reverse side for an accurate control of the operating temperature. Samples were annealed in synthetic air for 4 h at 700 degrees C in order to stabilise their microstructure. Two different thicknesses (150 and 300 nm) were deposited in order to study the influence of this parameter on both the microstructure and sensor response. Both XRD analysis and FEG-SEM images show a smaller grain size for the 150 nm-thick samples. The best operating temperature was established at 340 and 300 degrees C for 150 and 300 nm-thick samples respectively. A higher sensitivity was obtained for the samples of lower thickness for a set of HCHO concentrations ranging from 5 to 20 ppm. Moreover, the repeatability of the experiments was tested for the most sensitive samples. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：947 / 952

页数：6

共 27 条

[1]

Formaldehyde sensor based on Ni-doped tetrapod-shaped ZnO nanopowder induced by external magnetic field [J].