Low temperature selective NO2 sensors by nanostructured fibres of ZnO

被引:153
作者
Baratto, C
Sberveglieri, G
Onischuk, A
Caruso, B
di Stasio, S
机构
[1] Univ Brescia, Dept Chem & Phys, I-25133 Brescia, Italy
[2] CNR, Ist Motori, Aerosol & Nanostruct Lab, I-80125 Naples, Italy
[3] Inst Chem Kinet & Combust, Novosibirsk 630090, Russia
关键词
zinc oxide; gas sensor; NO2; detection; low working temperature;
D O I
10.1016/j.snb.2003.12.045
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
We studied the gas sensing properties of Zn nanopowders synthesised by an aerosol route. Two different powder morphologies were obtained: fibre-mats and cauliflower structure. Both sensors showed a great sensitivity against sub-ppm concentration of NO2 at low working temperature. The fibre powders relative response towards 0.4 ppm of NO2 is 50, while relative response of the cauliflower structure is 8 at 100degreesC. Both sensors were also selective, since no resistance variation was observed for CO, and ethanol. On the contrary resistance variations were observed with relative humidity changes. Sensors behaviour was studied at different working temperatures in the range 20-150degreesC. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:261 / 265
页数:5
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