Publication: Electrochemically functionalized single-walled carbon nanotubes for ultrasensitive detection of BTEX vapors
Issued Date
2021-07-15
Resource Type
ISSN
01679317
Other identifier(s)
2-s2.0-85107809445
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Mahidol University
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SCOPUS
Bibliographic Citation
Microelectronic Engineering. Vol.247, (2021)
Suggested Citation
Tapan Sarkar, Sira Srinives Electrochemically functionalized single-walled carbon nanotubes for ultrasensitive detection of BTEX vapors. Microelectronic Engineering. Vol.247, (2021). doi:10.1016/j.mee.2021.111584 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/76939
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Title
Electrochemically functionalized single-walled carbon nanotubes for ultrasensitive detection of BTEX vapors
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Abstract
Single-walled carbon nanotubes (SWNTs) have been functionalized electrochemically with porphyrin and were employed as the channel to fabricate the chemical field-effect transistor. Tetraphenylporphyrin was chosen for functionalization purpose. The primary aim of this study was to evaluate the sensing performance of functionalized SWNTs for the detection of BTEX vapor and to understand the underlying mechanism for the detection. The functionalization showed a significant enhancement in the sensing response for all analytes starting from 1.25 ppm to 15 ppm of concentration. A sub-ppm limit of detection was also observed. The systematic study of field effect transistor (FET) measurements indicates that the sensing mechanism is dominated by the electrostatic gating effect.