Properties of a weakly ionized NO gas sensor based on multi-walled carbon nanotubes

Jingyuan Zhang; Yong Zhang; Zhigang Pan; Shuang Yang; Jinghui Shi; Shengtao Li; Daomin Min; Xin Li; Xiaohua Wang; Dingxin Liu; Aijun Yang

doi:10.1063/1.4930020

Properties of a weakly ionized NO gas sensor based on multi-walled carbon nanotubes

Jingyuan Zhang, Yong Zhang, Zhigang Pan, Shuang Yang, Jinghui Shi, Shengtao Li, Daomin Min, Xin Li, Xiaohua Wang, Dingxin Liu, Aijun Yang

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

21 Citations (Scopus)

Abstract

Nitric oxide NO is one of the major targets for environmental monitoring, but the existing NO sensors are limited by their low sensitivity and narrow test range. Here, a NO gas sensor employing multiwalled carbon nanotubes (MWCNTs) was fabricated, and its properties in NO-N₂ mixture were investigated from both emission and ionization. The current I_e passing through the nanotubes cathode was found to decrease with increasing NO concentration and increase linearly in different slopes with the extracting voltage U_e. It is shown that the Schottky barrier of the MWCNTs calculated by I_e increased with NO concentration due to the adsorption of NO gas, which restrained the electron emission and consequently weakened the ionization. The positive ion currents I_c passing through the collecting electrode at different voltages of U_e were found to monotonically decrease with increasing NO concentration, which was induced by both of the reduced electron emission and the consumption of the two excited metastable states N₂(A³Σ_u⁺) and N₂(a′¹Σ_u^-) by NO. The sensor exhibited high sensitivity at the low temperature of 30°C. The calculated conductivity was found to be able to take place of I_c for NO detection in a wide voltage range of 80-150 V U_e.

Original language	English
Article number	093104
Journal	Applied Physics Letters
Volume	107
Issue number	9
DOIs	https://doi.org/10.1063/1.4930020
Publication status	Published - 2015 Aug 31
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4930020

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title = "Properties of a weakly ionized NO gas sensor based on multi-walled carbon nanotubes",

abstract = "Nitric oxide NO is one of the major targets for environmental monitoring, but the existing NO sensors are limited by their low sensitivity and narrow test range. Here, a NO gas sensor employing multiwalled carbon nanotubes (MWCNTs) was fabricated, and its properties in NO-N2 mixture were investigated from both emission and ionization. The current Ie passing through the nanotubes cathode was found to decrease with increasing NO concentration and increase linearly in different slopes with the extracting voltage Ue. It is shown that the Schottky barrier of the MWCNTs calculated by Ie increased with NO concentration due to the adsorption of NO gas, which restrained the electron emission and consequently weakened the ionization. The positive ion currents Ic passing through the collecting electrode at different voltages of Ue were found to monotonically decrease with increasing NO concentration, which was induced by both of the reduced electron emission and the consumption of the two excited metastable states N2(A3Σu+) and N2(a′1Σu-) by NO. The sensor exhibited high sensitivity at the low temperature of 30°C. The calculated conductivity was found to be able to take place of Ic for NO detection in a wide voltage range of 80-150 V Ue.",

author = "Jingyuan Zhang and Yong Zhang and Zhigang Pan and Shuang Yang and Jinghui Shi and Shengtao Li and Daomin Min and Xin Li and Xiaohua Wang and Dingxin Liu and Aijun Yang",

year = "2015",

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doi = "10.1063/1.4930020",

language = "English",

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journal = "Applied Physics Letters",

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T1 - Properties of a weakly ionized NO gas sensor based on multi-walled carbon nanotubes

AU - Zhang, Jingyuan

AU - Zhang, Yong

AU - Pan, Zhigang

AU - Yang, Shuang

AU - Shi, Jinghui

AU - Li, Shengtao

AU - Min, Daomin

AU - Li, Xin

AU - Wang, Xiaohua

AU - Liu, Dingxin

AU - Yang, Aijun

PY - 2015/8/31

Y1 - 2015/8/31

N2 - Nitric oxide NO is one of the major targets for environmental monitoring, but the existing NO sensors are limited by their low sensitivity and narrow test range. Here, a NO gas sensor employing multiwalled carbon nanotubes (MWCNTs) was fabricated, and its properties in NO-N2 mixture were investigated from both emission and ionization. The current Ie passing through the nanotubes cathode was found to decrease with increasing NO concentration and increase linearly in different slopes with the extracting voltage Ue. It is shown that the Schottky barrier of the MWCNTs calculated by Ie increased with NO concentration due to the adsorption of NO gas, which restrained the electron emission and consequently weakened the ionization. The positive ion currents Ic passing through the collecting electrode at different voltages of Ue were found to monotonically decrease with increasing NO concentration, which was induced by both of the reduced electron emission and the consumption of the two excited metastable states N2(A3Σu+) and N2(a′1Σu-) by NO. The sensor exhibited high sensitivity at the low temperature of 30°C. The calculated conductivity was found to be able to take place of Ic for NO detection in a wide voltage range of 80-150 V Ue.

AB - Nitric oxide NO is one of the major targets for environmental monitoring, but the existing NO sensors are limited by their low sensitivity and narrow test range. Here, a NO gas sensor employing multiwalled carbon nanotubes (MWCNTs) was fabricated, and its properties in NO-N2 mixture were investigated from both emission and ionization. The current Ie passing through the nanotubes cathode was found to decrease with increasing NO concentration and increase linearly in different slopes with the extracting voltage Ue. It is shown that the Schottky barrier of the MWCNTs calculated by Ie increased with NO concentration due to the adsorption of NO gas, which restrained the electron emission and consequently weakened the ionization. The positive ion currents Ic passing through the collecting electrode at different voltages of Ue were found to monotonically decrease with increasing NO concentration, which was induced by both of the reduced electron emission and the consumption of the two excited metastable states N2(A3Σu+) and N2(a′1Σu-) by NO. The sensor exhibited high sensitivity at the low temperature of 30°C. The calculated conductivity was found to be able to take place of Ic for NO detection in a wide voltage range of 80-150 V Ue.

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Properties of a weakly ionized NO gas sensor based on multi-walled carbon nanotubes

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