Single walled carbon nanotubes (SWNTs) as a gas sensor

Bhabendra K. Pradhan; Gamini U. Sumanasekera; Clement K.W. Adu; Hugo Romero; Peter C. Eklund

Single walled carbon nanotubes (SWNTs) as a gas sensor

Bhabendra K. Pradhan, Gamini U. Sumanasekera, Clement K.W. Adu, Hugo Romero, Peter C. Eklund

Research output: Contribution to journal › Conference article › peer-review

Abstract

A thermoelectric "nano-nose" has been built from tangled bundles of single-walled carbon nanotubes (SWNT). The detector's thermoelectric response ΔS is sensitive to the logarithmic energy derivative of the additional bundle resistivity (ρ_a) which is identified with the adsorbed molecules. The response is therefore specific to the details of the interaction of the adsorbed molecule with the nanotube wall; even gases such as He, N₂ and H₂ can be easily detected. Plots of ΔS vs. ρ_a are sensitive to whether oxidation or reduction of the tube wall is taking place, and to whether the gas molecule is physisorbed or chemisorbed. The utility of the sensor stems from the amphoteric nature of the SWNT, the quasi-one-dimensional character of the charge conduction and the high specific surface area of SWNTs.

Original language	English (US)
Pages (from-to)	A14201-A14206
Journal	Materials Research Society Symposium - Proceedings
Volume	633
State	Published - 2001
Event	Nanotubes and Related Materials - Boston, MA, United States Duration: Nov 27 2000 → Nov 30 2000

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

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title = "Single walled carbon nanotubes (SWNTs) as a gas sensor",

abstract = "A thermoelectric {"}nano-nose{"} has been built from tangled bundles of single-walled carbon nanotubes (SWNT). The detector's thermoelectric response ΔS is sensitive to the logarithmic energy derivative of the additional bundle resistivity (ρa) which is identified with the adsorbed molecules. The response is therefore specific to the details of the interaction of the adsorbed molecule with the nanotube wall; even gases such as He, N2 and H2 can be easily detected. Plots of ΔS vs. ρa are sensitive to whether oxidation or reduction of the tube wall is taking place, and to whether the gas molecule is physisorbed or chemisorbed. The utility of the sensor stems from the amphoteric nature of the SWNT, the quasi-one-dimensional character of the charge conduction and the high specific surface area of SWNTs.",

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T1 - Single walled carbon nanotubes (SWNTs) as a gas sensor

AU - Pradhan, Bhabendra K.

AU - Sumanasekera, Gamini U.

AU - Adu, Clement K.W.

AU - Romero, Hugo

AU - Eklund, Peter C.

PY - 2001

Y1 - 2001

N2 - A thermoelectric "nano-nose" has been built from tangled bundles of single-walled carbon nanotubes (SWNT). The detector's thermoelectric response ΔS is sensitive to the logarithmic energy derivative of the additional bundle resistivity (ρa) which is identified with the adsorbed molecules. The response is therefore specific to the details of the interaction of the adsorbed molecule with the nanotube wall; even gases such as He, N2 and H2 can be easily detected. Plots of ΔS vs. ρa are sensitive to whether oxidation or reduction of the tube wall is taking place, and to whether the gas molecule is physisorbed or chemisorbed. The utility of the sensor stems from the amphoteric nature of the SWNT, the quasi-one-dimensional character of the charge conduction and the high specific surface area of SWNTs.

AB - A thermoelectric "nano-nose" has been built from tangled bundles of single-walled carbon nanotubes (SWNT). The detector's thermoelectric response ΔS is sensitive to the logarithmic energy derivative of the additional bundle resistivity (ρa) which is identified with the adsorbed molecules. The response is therefore specific to the details of the interaction of the adsorbed molecule with the nanotube wall; even gases such as He, N2 and H2 can be easily detected. Plots of ΔS vs. ρa are sensitive to whether oxidation or reduction of the tube wall is taking place, and to whether the gas molecule is physisorbed or chemisorbed. The utility of the sensor stems from the amphoteric nature of the SWNT, the quasi-one-dimensional character of the charge conduction and the high specific surface area of SWNTs.

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M3 - Conference article

AN - SCOPUS:0035558493

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Y2 - 27 November 2000 through 30 November 2000

ER -

Single walled carbon nanotubes (SWNTs) as a gas sensor

Abstract

All Science Journal Classification (ASJC) codes

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