Vertically aligned carbon nanotube arrays for room temperature gas sensors

Suresh Rajaputra; Raghu Mangu; Ning Ma; Patricia Clore; Dali Qian; Rodney Andrews; Sovannary Phok; Janet Lumpp; Vijay Singh

Vertically aligned carbon nanotube arrays for room temperature gas sensors

Suresh Rajaputra, Raghu Mangu, Ning Ma, Patricia Clore, Dali Qian, Rodney Andrews, Sovannary Phok, Janet Lumpp, Vijay Singh

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Scopus citations

Abstract

Vertically aligned multiwalled carbon nanotube (CNT) arrays were fabricated in anodized aluminum oxide (AAO) templates without the use of a catalyst, using xylene pyrolysis. The CNT arrays in AAO template were integrated into a resistive sensor design. The sensors were found to be highly responsive to NH₃ and NO₂ with steady state sensitivities of 5% and 10% for 100ppm of NH₃ and NO₂ respectively, at room temperature. Results were interpreted in terms of the CNTs acting as p-type semiconductors. A study was undertaken to elucidate the dependence of sensitivity on the thickness of the conducting amorphous carbon layers on top and bottom. Recovery of the MWNT gas sensor was studied for different types of desorption techniques. The thickness of the amorphous carbon layer (sheet resistance) was found to be critical in determining the sensor response.

Original language	English
Title of host publication	Nanotubes and Related Nanostructures
Pages	151-157
Number of pages	7
State	Published - 2008
Event	2007 MRS Fall Meeting - Boston, MA, United States Duration: Nov 26 2007 → Nov 30 2007

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	1057
ISSN (Print)	0272-9172

Conference

Conference	2007 MRS Fall Meeting
Country/Territory	United States
City	Boston, MA
Period	11/26/07 → 11/30/07

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

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title = "Vertically aligned carbon nanotube arrays for room temperature gas sensors",

abstract = "Vertically aligned multiwalled carbon nanotube (CNT) arrays were fabricated in anodized aluminum oxide (AAO) templates without the use of a catalyst, using xylene pyrolysis. The CNT arrays in AAO template were integrated into a resistive sensor design. The sensors were found to be highly responsive to NH3 and NO2 with steady state sensitivities of 5% and 10% for 100ppm of NH3 and NO2 respectively, at room temperature. Results were interpreted in terms of the CNTs acting as p-type semiconductors. A study was undertaken to elucidate the dependence of sensitivity on the thickness of the conducting amorphous carbon layers on top and bottom. Recovery of the MWNT gas sensor was studied for different types of desorption techniques. The thickness of the amorphous carbon layer (sheet resistance) was found to be critical in determining the sensor response.",

author = "Suresh Rajaputra and Raghu Mangu and Ning Ma and Patricia Clore and Dali Qian and Rodney Andrews and Sovannary Phok and Janet Lumpp and Vijay Singh",

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language = "English",

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T1 - Vertically aligned carbon nanotube arrays for room temperature gas sensors

AU - Rajaputra, Suresh

AU - Mangu, Raghu

AU - Ma, Ning

AU - Clore, Patricia

AU - Qian, Dali

AU - Andrews, Rodney

AU - Phok, Sovannary

AU - Lumpp, Janet

AU - Singh, Vijay

PY - 2008

Y1 - 2008

N2 - Vertically aligned multiwalled carbon nanotube (CNT) arrays were fabricated in anodized aluminum oxide (AAO) templates without the use of a catalyst, using xylene pyrolysis. The CNT arrays in AAO template were integrated into a resistive sensor design. The sensors were found to be highly responsive to NH3 and NO2 with steady state sensitivities of 5% and 10% for 100ppm of NH3 and NO2 respectively, at room temperature. Results were interpreted in terms of the CNTs acting as p-type semiconductors. A study was undertaken to elucidate the dependence of sensitivity on the thickness of the conducting amorphous carbon layers on top and bottom. Recovery of the MWNT gas sensor was studied for different types of desorption techniques. The thickness of the amorphous carbon layer (sheet resistance) was found to be critical in determining the sensor response.

AB - Vertically aligned multiwalled carbon nanotube (CNT) arrays were fabricated in anodized aluminum oxide (AAO) templates without the use of a catalyst, using xylene pyrolysis. The CNT arrays in AAO template were integrated into a resistive sensor design. The sensors were found to be highly responsive to NH3 and NO2 with steady state sensitivities of 5% and 10% for 100ppm of NH3 and NO2 respectively, at room temperature. Results were interpreted in terms of the CNTs acting as p-type semiconductors. A study was undertaken to elucidate the dependence of sensitivity on the thickness of the conducting amorphous carbon layers on top and bottom. Recovery of the MWNT gas sensor was studied for different types of desorption techniques. The thickness of the amorphous carbon layer (sheet resistance) was found to be critical in determining the sensor response.

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M3 - Conference contribution

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Vertically aligned carbon nanotube arrays for room temperature gas sensors

Abstract

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Conference

ASJC Scopus subject areas

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