Flexible NO2 gas sensor based on single-walled carbon nanotubes on polytetrafluoroethylene substrates

被引:45
作者
Agarwal, Pankaj B. [1 ,2 ]
Alam, Bayazeed [1 ,3 ]
Sharma, Daya Shankar [1 ,4 ]
Sharma, Sumit [1 ,5 ]
Mandal, Soumen [2 ,6 ]
Agarwal, Ajay [1 ,2 ]
机构
[1] CSIR, CEERI, Nano Biosensors Grp, Pilani 333031, Rajasthan, India
[2] Acad Sci & Innovat Res AcSIR, Madras 600113, Tamil Nadu, India
[3] Jamia Millia Islamia, Delhi 110025, India
[4] Maulana Azad Natl Inst Technol, Bhopal 462051, India
[5] Rajiv Gandhi Proudyogiki Vishwavidyalaya, Bhopal 462036, India
[6] CSIR, CMERI, Microsyst Technol Lab, Durgapur 713209, India
来源
FLEXIBLE AND PRINTED ELECTRONICS | 2018年 / 3卷 / 03期
关键词
NO2 gas sensors; chemical sensors; carbon nanotubes; PTFE substrates; wearable sensors; flexible electronics; SENSING PERFORMANCE; SENSITIVITY; FILM;
D O I
10.1088/2058-8585/aacc8f
中图分类号
T [工业技术];
学科分类号
120111 [工业工程];
摘要
This paper presents a flexible and reliable chemiresistor-type NO2 gas sensor based on single-walled carbon nanotubes (SWNTs) on polytetrafluoroethylene (PTFE) membrane filter substrates. The sensor is realized by using a cost-effective spray coating in the preparation of SWNTs thin film, followed by the fabrication of metal contacts using a shadow mask and polyethyleneimine (PEI) noncovalent functionalization of the SWNTs. This showed a high sensitivity to NO2 gas at room temperature in dry air; 21.58% to 167.7% for concentrations of 0.75 ppm to 5 ppm, and was almost nonsensitive to ammonia. Gas sensing characterization results, obtained for various substrate bending/wrapping over different cylinders with diameters of 75 mm, 12.5 mm, and 6 mm showed that bending does not significantly affect sensitivity for NO2 concentrations of 0.75 ppm to 2 ppm, while in the case of 3 ppm to 5 ppm NO2, the bent samples indicate enhanced sensitivity. This is probably because of the porous nature of PTFE substrates; these sensors were 1.5 to 2.7 times more sensitive than those fabricated over silicon substrate for 1 ppm and 5 ppm, respectively. Moreover, the relative humidity of 10% and 30% significantly reduced the sensitivity of the sensors. The presented results could be useful for the future development of flexible electronics/sensors for monitoring outdoor air quality and for the detection of volatile organic compounds.
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页数:8
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