SnO2 nanowires decorated by insulating amorphous carbon layers for improved room-temperature NO2 sensing

Myung Sik Choi; Han Gil Na; Jae Hoon Bang; Ali Mirzaei; Seungmin Han; Ha Young Lee; Sang Sub Kim; Hyoun Woo Kim; Changhyun Jin

doi:10.1016/j.snb.2020.128801

SnO₂ nanowires decorated by insulating amorphous carbon layers for improved room-temperature NO₂ sensing

Myung Sik Choi, Han Gil Na, Jae Hoon Bang, Ali Mirzaei, Seungmin Han, Ha Young Lee, Sang Sub Kim, Hyoun Woo Kim, Changhyun Jin

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

33 Scopus citations

Abstract

We fabricated gas sensors by decorating amorphous carbon layers on the surfaces of SnO₂ nanowires. Pretreatment and functionalization were not required for the synthesis of the SnO₂-based nanocomposite, requiring only short few-second processing times. A sensing mechanism is proposed to explain the room-temperature (24 °C) operation of the gas sensor. The amorphous carbon not only increased the surface area, but also provided electronic effects improving the NO₂ gas sensing likely by supplying electrons to the SnO₂ and/or changing the conducting channel width inside the SnO₂ by carrier transfer. The optimized gas sensor, having high response and high selectivity, can be utilized for room-temperature NO₂ gas sensing applications.

Original language	English
Article number	128801
Journal	Sensors and Actuators, B: Chemical
Volume	326
DOIs	https://doi.org/10.1016/j.snb.2020.128801
State	Published - 1 Jan 2021

Keywords

Amorphous carbon
Gas sensor
Room temperature
Tin oxide

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10.1016/j.snb.2020.128801

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title = "SnO2 nanowires decorated by insulating amorphous carbon layers for improved room-temperature NO2 sensing",

abstract = "We fabricated gas sensors by decorating amorphous carbon layers on the surfaces of SnO2 nanowires. Pretreatment and functionalization were not required for the synthesis of the SnO2-based nanocomposite, requiring only short few-second processing times. A sensing mechanism is proposed to explain the room-temperature (24 °C) operation of the gas sensor. The amorphous carbon not only increased the surface area, but also provided electronic effects improving the NO2 gas sensing likely by supplying electrons to the SnO2 and/or changing the conducting channel width inside the SnO2 by carrier transfer. The optimized gas sensor, having high response and high selectivity, can be utilized for room-temperature NO2 gas sensing applications.",

keywords = "Amorphous carbon, Gas sensor, Room temperature, Tin oxide",

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T1 - SnO2 nanowires decorated by insulating amorphous carbon layers for improved room-temperature NO2 sensing

AU - Choi, Myung Sik

AU - Na, Han Gil

AU - Bang, Jae Hoon

AU - Mirzaei, Ali

AU - Han, Seungmin

AU - Lee, Ha Young

AU - Kim, Sang Sub

AU - Kim, Hyoun Woo

AU - Jin, Changhyun

PY - 2021/1/1

Y1 - 2021/1/1

N2 - We fabricated gas sensors by decorating amorphous carbon layers on the surfaces of SnO2 nanowires. Pretreatment and functionalization were not required for the synthesis of the SnO2-based nanocomposite, requiring only short few-second processing times. A sensing mechanism is proposed to explain the room-temperature (24 °C) operation of the gas sensor. The amorphous carbon not only increased the surface area, but also provided electronic effects improving the NO2 gas sensing likely by supplying electrons to the SnO2 and/or changing the conducting channel width inside the SnO2 by carrier transfer. The optimized gas sensor, having high response and high selectivity, can be utilized for room-temperature NO2 gas sensing applications.

AB - We fabricated gas sensors by decorating amorphous carbon layers on the surfaces of SnO2 nanowires. Pretreatment and functionalization were not required for the synthesis of the SnO2-based nanocomposite, requiring only short few-second processing times. A sensing mechanism is proposed to explain the room-temperature (24 °C) operation of the gas sensor. The amorphous carbon not only increased the surface area, but also provided electronic effects improving the NO2 gas sensing likely by supplying electrons to the SnO2 and/or changing the conducting channel width inside the SnO2 by carrier transfer. The optimized gas sensor, having high response and high selectivity, can be utilized for room-temperature NO2 gas sensing applications.

KW - Amorphous carbon

KW - Gas sensor

KW - Room temperature

KW - Tin oxide

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ER -

SnO₂ nanowires decorated by insulating amorphous carbon layers for improved room-temperature NO₂ sensing

Abstract

Keywords

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