Effect of single wall carbon nanotube networks on gas sensor response and detection limit

被引：106

作者：

Kumar, Deepak ^{[1
,2
]}

Chaturvedi, Poornendu ^{[1
]}

Saho, Praveen ^{[1
]}

Jha, Pika ^{[1
]}

Chouksey, Abhilasha ^{[1
]}

Lal, Mohan ^{[1
]}

Rawat, J. S. B. S. ^{[1
]}

Tandon, R. P. ^{[2
]}

Chaudhury, P. K. ^{[1
]}

机构：

[1] Solid State Phys Lab, Lucknow Rd, Delhi 110054, India

[2] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2017年 / 240卷

关键词：

Gas sensor; Response; Analyte; Network; Heterogeneity; Adsorption; Detection limit; 1/F NOISE; NO2; TRANSPARENT; ADSORPTION; MOLECULES; PRISTINE; PROGRESS; DEVICES; FILMS; NH3;

D O I：

10.1016/j.snb.2016.09.095

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this work Single wall carbon nanotube (SWNT) based gas sensor is fabricated with mainly two type of surface-networks, (i) SWNT random network (CNT-TFR) and (ii) SWNT aligned network (CNT-mu R). Investigations of sensor response and its signal-to-noise ratio have been carried out for both the networks. Sensing measurement is performed by exposing sensor to NO2 concentration from 0.5 ppm to 20 ppm over CNT-TFR and CNT-mu R. It has been found that the response of CNT-mu R is higher than CNT-TFR. The variation of response with concentration for both sensors is investigated and it is observed that type of surface network affects the surface heterogeneity and hence adsorption capacity of sensor. The detection limit of these gas sensors is 125 ppt and 165 ppt for CNT-TFR and CNT-mu R respectively. CNT-TFR has a better detection limit (DL) and signal-to-noise ratio as compared to CNT-mu R due to better surface homogeneity of CNT-TFR. The detection limit for the aligned gas sensors decreases as network density decreases. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：1134 / 1140

页数：7

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