The gas sensing properties of single-walled carbon nanotubes deposited on an aminosilane monolayer

Thu Hong Tran; Jin Woo Lee; Kyongsoo Lee; Yang Doo Lee; Byeong Kwon Ju

doi:10.1016/j.snb.2007.07.104

The gas sensing properties of single-walled carbon nanotubes deposited on an aminosilane monolayer

Thu Hong Tran, Jin Woo Lee, Kyongsoo Lee, Yang Doo Lee, Byeong Kwon Ju

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

This paper presents our study on the effects of an aminosilane monolayer on the gas sensing properties of single-walled carbon nanotubes (SWCNTs). A gas sensor for nitrogen dioxide (NO₂) detection was fabricated by conventional photolithography process on an oxidized silicon wafer functionalized with 3-aminopropyltriethoxysilane (APTES). Such a CNT-based gas sensor was found to result in high sensitivity and fast response time compared with the sensor fabricated on a non-silanised surface. The amine groups in the APTES monolayer, electron donating in nature, played a role of charge transfer to the semiconducting SWCNTs, and hence the amount of electrons transferred from SWCNTs to NO₂ molecules increased. Our results suggest that the APTES intended originally for selective placement of individual SWCNTs could be used to enhance the gas sensing properties of the SWCNTs.

Original language	English
Pages (from-to)	67-71
Number of pages	5
Journal	Sensors and Actuators, B: Chemical
Volume	129
Issue number	1
DOIs	https://doi.org/10.1016/j.snb.2007.07.104
Publication status	Published - 2008 Jan 29

Bibliographical note

Funding Information:
This work was supported in part by MIC and IITA through the IT Leading R&D Support Project. The authors thank the government for financial support.

Keywords

Electron donation
Gas sensor
Nitrogen dioxide (NO)
Self-assembled monolayer (SAM)
Single-walled carbon nanotubes (SWCNTs)

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1016/j.snb.2007.07.104

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title = "The gas sensing properties of single-walled carbon nanotubes deposited on an aminosilane monolayer",

abstract = "This paper presents our study on the effects of an aminosilane monolayer on the gas sensing properties of single-walled carbon nanotubes (SWCNTs). A gas sensor for nitrogen dioxide (NO2) detection was fabricated by conventional photolithography process on an oxidized silicon wafer functionalized with 3-aminopropyltriethoxysilane (APTES). Such a CNT-based gas sensor was found to result in high sensitivity and fast response time compared with the sensor fabricated on a non-silanised surface. The amine groups in the APTES monolayer, electron donating in nature, played a role of charge transfer to the semiconducting SWCNTs, and hence the amount of electrons transferred from SWCNTs to NO2 molecules increased. Our results suggest that the APTES intended originally for selective placement of individual SWCNTs could be used to enhance the gas sensing properties of the SWCNTs.",

keywords = "Electron donation, Gas sensor, Nitrogen dioxide (NO), Self-assembled monolayer (SAM), Single-walled carbon nanotubes (SWCNTs)",

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note = "Funding Information: This work was supported in part by MIC and IITA through the IT Leading R&D Support Project. The authors thank the government for financial support. ",

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AU - Tran, Thu Hong

AU - Lee, Jin Woo

AU - Lee, Kyongsoo

AU - Lee, Yang Doo

AU - Ju, Byeong Kwon

N1 - Funding Information: This work was supported in part by MIC and IITA through the IT Leading R&D Support Project. The authors thank the government for financial support.

PY - 2008/1/29

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N2 - This paper presents our study on the effects of an aminosilane monolayer on the gas sensing properties of single-walled carbon nanotubes (SWCNTs). A gas sensor for nitrogen dioxide (NO2) detection was fabricated by conventional photolithography process on an oxidized silicon wafer functionalized with 3-aminopropyltriethoxysilane (APTES). Such a CNT-based gas sensor was found to result in high sensitivity and fast response time compared with the sensor fabricated on a non-silanised surface. The amine groups in the APTES monolayer, electron donating in nature, played a role of charge transfer to the semiconducting SWCNTs, and hence the amount of electrons transferred from SWCNTs to NO2 molecules increased. Our results suggest that the APTES intended originally for selective placement of individual SWCNTs could be used to enhance the gas sensing properties of the SWCNTs.

AB - This paper presents our study on the effects of an aminosilane monolayer on the gas sensing properties of single-walled carbon nanotubes (SWCNTs). A gas sensor for nitrogen dioxide (NO2) detection was fabricated by conventional photolithography process on an oxidized silicon wafer functionalized with 3-aminopropyltriethoxysilane (APTES). Such a CNT-based gas sensor was found to result in high sensitivity and fast response time compared with the sensor fabricated on a non-silanised surface. The amine groups in the APTES monolayer, electron donating in nature, played a role of charge transfer to the semiconducting SWCNTs, and hence the amount of electrons transferred from SWCNTs to NO2 molecules increased. Our results suggest that the APTES intended originally for selective placement of individual SWCNTs could be used to enhance the gas sensing properties of the SWCNTs.

KW - Electron donation

KW - Gas sensor

KW - Nitrogen dioxide (NO)

KW - Self-assembled monolayer (SAM)

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The gas sensing properties of single-walled carbon nanotubes deposited on an aminosilane monolayer

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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