Highly sensitive SnO2 hollow nanofiber-based NO2 gas sensors

SENSORS AND ACTUATORS B-CHEMICAL

卷:160

Article

Cho, Nam Gyu¹  Yang, Dae Jin²  Jin, Mi-Jin³  Kim, Ho-Gi¹  Tuller, Harry L.²  Kim, Il-Doo¹ 

[1] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea

[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[3] Korea Inst Sci & Technol, Optoelect Mat Ctr, Seoul 130650, South Korea

关键词: Tin oxide;    Gas sensor;    Electrospinning;    Hollow;    Nanofiber;   

DOI  :  10.1016/j.snb.2011.07.035

来源: Elsevier

【 摘 要 】

SnO2 hollow nanofibers (HNFs) with diameters of 300-500 nm were fabricated via electrospinning of templating nanofibers and RF-sputtering of SnO2 thin overlayers (15-20 nm thick and comparable grain size) followed by heat-treatment at 450 degrees C. Gas sensors using these HNFs exhibited n-type gas sensing characteristics and an enhanced gas response to 2 ppm NO2 (R-gas/R-air = 81.4) as compared to that (R-gas/R-air =19.9) of planar SnO2 thin films. The enhanced response to NO2 is attributed to the greater accessible active area and the greater space charge modulation depth associated with the hollow thin walled structures. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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