UV light irradiation enhanced gas sensor selectivity of NO2 and SO2 using rGO functionalized with hollow SnO2 nanofibers

Weiwei Li; Jiahui Guo; Li Cai; Wenzhi Qi; Yilin Sun; Jian Long Xu; Mengxing Sun; Hongwei Zhu; Lan Xiang; Dan Xie; Tianling Ren

doi:10.1016/j.snb.2019.03.133

UV light irradiation enhanced gas sensor selectivity of NO₂ and SO₂ using rGO functionalized with hollow SnO₂ nanofibers

Weiwei Li, Jiahui Guo, Li Cai^*, Wenzhi Qi, Yilin Sun, Jian Long Xu, Mengxing Sun, Hongwei Zhu, Lan Xiang, Dan Xie, Tianling Ren

^*Corresponding author for this work

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

123 Citations (Scopus)

Abstract

Herein, to enhance selective detection of NO₂ and SO₂ using a single device, an ultraviolet (UV) light activated gas sensor has been reported based on reduced graphene oxide (rGO) functionalized with hollow SnO₂ nanofibers (NFs) at room temperature. The porous hollow SnO₂ NFs are synthesized using electrospinning and calcination treatment, then different contents of SnO₂ are introduced to rGO for preparation of rGO/SnO₂ nanocomposites by facile magnetic stirring and ultrasonic treatment. The rGO/SnO₂ samples reveal obvious sensing response, great reversibility and good humidity resistance to target gases at ppm level. Under different intensities of UV light illumination, gas sensing properties of rGO/SnO₂ are studied to explore the photoexcited sensing behaviors. The greatly enhanced selective detection to NO₂ (102%) and SO₂ (11%) is achieved with a response ratio of 9.3 by using UV light illumination. The results show sensor response and selectivity can be improved using appropriate intensity of excitation light, demonstrating significant modulation effect of UV light assistance on gas detection. The mechanism may be attributed to light motivated electron-hole pairs due to built-in electric fields under UV light illumination, which can be captured by target gases and lead to UV controlled gas sensing performance.

Original language	English
Pages (from-to)	443-452
Number of pages	10
Journal	Sensors and Actuators, B: Chemical
Volume	290
DOIs	https://doi.org/10.1016/j.snb.2019.03.133
Publication status	Published - 1 Jul 2019
Externally published	Yes

Keywords

Gas sensors
Reduced graphene oxide
Selectivity
Tin oxide nanofibers
Ultraviolet light

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10.1016/j.snb.2019.03.133

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@article{31c233c85a494576ac1723695dfaa84c,

title = "UV light irradiation enhanced gas sensor selectivity of NO2 and SO2 using rGO functionalized with hollow SnO2 nanofibers",

abstract = "Herein, to enhance selective detection of NO2 and SO2 using a single device, an ultraviolet (UV) light activated gas sensor has been reported based on reduced graphene oxide (rGO) functionalized with hollow SnO2 nanofibers (NFs) at room temperature. The porous hollow SnO2 NFs are synthesized using electrospinning and calcination treatment, then different contents of SnO2 are introduced to rGO for preparation of rGO/SnO2 nanocomposites by facile magnetic stirring and ultrasonic treatment. The rGO/SnO2 samples reveal obvious sensing response, great reversibility and good humidity resistance to target gases at ppm level. Under different intensities of UV light illumination, gas sensing properties of rGO/SnO2 are studied to explore the photoexcited sensing behaviors. The greatly enhanced selective detection to NO2 (102%) and SO2 (11%) is achieved with a response ratio of 9.3 by using UV light illumination. The results show sensor response and selectivity can be improved using appropriate intensity of excitation light, demonstrating significant modulation effect of UV light assistance on gas detection. The mechanism may be attributed to light motivated electron-hole pairs due to built-in electric fields under UV light illumination, which can be captured by target gases and lead to UV controlled gas sensing performance.",

keywords = "Gas sensors, Reduced graphene oxide, Selectivity, Tin oxide nanofibers, Ultraviolet light",

author = "Weiwei Li and Jiahui Guo and Li Cai and Wenzhi Qi and Yilin Sun and Xu, {Jian Long} and Mengxing Sun and Hongwei Zhu and Lan Xiang and Dan Xie and Tianling Ren",

note = "Publisher Copyright: {\textcopyright} 2019",

year = "2019",

month = jul,

day = "1",

doi = "10.1016/j.snb.2019.03.133",

language = "English",

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TY - JOUR

T1 - UV light irradiation enhanced gas sensor selectivity of NO2 and SO2 using rGO functionalized with hollow SnO2 nanofibers

AU - Li, Weiwei

AU - Guo, Jiahui

AU - Cai, Li

AU - Qi, Wenzhi

AU - Sun, Yilin

AU - Xu, Jian Long

AU - Sun, Mengxing

AU - Zhu, Hongwei

AU - Xiang, Lan

AU - Xie, Dan

AU - Ren, Tianling

PY - 2019/7/1

Y1 - 2019/7/1

N2 - Herein, to enhance selective detection of NO2 and SO2 using a single device, an ultraviolet (UV) light activated gas sensor has been reported based on reduced graphene oxide (rGO) functionalized with hollow SnO2 nanofibers (NFs) at room temperature. The porous hollow SnO2 NFs are synthesized using electrospinning and calcination treatment, then different contents of SnO2 are introduced to rGO for preparation of rGO/SnO2 nanocomposites by facile magnetic stirring and ultrasonic treatment. The rGO/SnO2 samples reveal obvious sensing response, great reversibility and good humidity resistance to target gases at ppm level. Under different intensities of UV light illumination, gas sensing properties of rGO/SnO2 are studied to explore the photoexcited sensing behaviors. The greatly enhanced selective detection to NO2 (102%) and SO2 (11%) is achieved with a response ratio of 9.3 by using UV light illumination. The results show sensor response and selectivity can be improved using appropriate intensity of excitation light, demonstrating significant modulation effect of UV light assistance on gas detection. The mechanism may be attributed to light motivated electron-hole pairs due to built-in electric fields under UV light illumination, which can be captured by target gases and lead to UV controlled gas sensing performance.

AB - Herein, to enhance selective detection of NO2 and SO2 using a single device, an ultraviolet (UV) light activated gas sensor has been reported based on reduced graphene oxide (rGO) functionalized with hollow SnO2 nanofibers (NFs) at room temperature. The porous hollow SnO2 NFs are synthesized using electrospinning and calcination treatment, then different contents of SnO2 are introduced to rGO for preparation of rGO/SnO2 nanocomposites by facile magnetic stirring and ultrasonic treatment. The rGO/SnO2 samples reveal obvious sensing response, great reversibility and good humidity resistance to target gases at ppm level. Under different intensities of UV light illumination, gas sensing properties of rGO/SnO2 are studied to explore the photoexcited sensing behaviors. The greatly enhanced selective detection to NO2 (102%) and SO2 (11%) is achieved with a response ratio of 9.3 by using UV light illumination. The results show sensor response and selectivity can be improved using appropriate intensity of excitation light, demonstrating significant modulation effect of UV light assistance on gas detection. The mechanism may be attributed to light motivated electron-hole pairs due to built-in electric fields under UV light illumination, which can be captured by target gases and lead to UV controlled gas sensing performance.

KW - Gas sensors

KW - Reduced graphene oxide

KW - Selectivity

KW - Tin oxide nanofibers

KW - Ultraviolet light

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ER -

UV light irradiation enhanced gas sensor selectivity of NO₂ and SO₂ using rGO functionalized with hollow SnO₂ nanofibers

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