Highly selective and sensitive detection of NO2 using rGO-In2O3 structure on flexible substrate at low temperature

Chan Woong Na; Jae Hyeok Kim; Hyo Joong Kim; Hyung Sik Woo; Arunava Gupta; Han Ki Kim; Jong Heun Lee

doi:10.1016/j.snb.2017.08.172

Highly selective and sensitive detection of NO₂ using rGO-In₂O₃ structure on flexible substrate at low temperature

Chan Woong Na, Jae Hyeok Kim, Hyo Joong Kim, Hyung Sik Woo, Arunava Gupta, Han Ki Kim, Jong Heun Lee

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

55 Citations (Scopus)

Abstract

Reduced graphene oxide (rGO)-In₂O₃ hybrid materials were prepared by a solvothermal reaction of an In precursor containing rGO sheets, which were coated onto flexible substrates for gas sensors. The rGO-In₂O₃ flexible sensors showed a high and reversible response (resistance ratio = 22.3) to 500 ppb NO₂ at 150 °C and negligible cross-responses to C₂H₅OH, CO, NH₃, toluene, H₂, and HCHO. The ultrahigh response and selectivity of rGO-In₂O₃ hybrid materials to NO₂ were attributed to the chemical affinity of rGO to NO₂ and the extension of the electron depletion layer in n-type In₂O₃ forming a p-n junction with the p-type rGO.

Original language	English
Pages (from-to)	1671-1679
Number of pages	9
Journal	Sensors and Actuators, B: Chemical
Volume	255
DOIs	https://doi.org/10.1016/j.snb.2017.08.172
Publication status	Published - 2018 Feb

Keywords

Gas sensors
InO
NO
Reduced graphene oxide
p-n junction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1016/j.snb.2017.08.172

Cite this

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title = "Highly selective and sensitive detection of NO2 using rGO-In2O3 structure on flexible substrate at low temperature",

abstract = "Reduced graphene oxide (rGO)-In2O3 hybrid materials were prepared by a solvothermal reaction of an In precursor containing rGO sheets, which were coated onto flexible substrates for gas sensors. The rGO-In2O3 flexible sensors showed a high and reversible response (resistance ratio = 22.3) to 500 ppb NO2 at 150 °C and negligible cross-responses to C2H5OH, CO, NH3, toluene, H2, and HCHO. The ultrahigh response and selectivity of rGO-In2O3 hybrid materials to NO2 were attributed to the chemical affinity of rGO to NO2 and the extension of the electron depletion layer in n-type In2O3 forming a p-n junction with the p-type rGO.",

keywords = "Gas sensors, InO, NO, Reduced graphene oxide, p-n junction",

author = "Na, {Chan Woong} and Kim, {Jae Hyeok} and Kim, {Hyo Joong} and Woo, {Hyung Sik} and Arunava Gupta and Kim, {Han Ki} and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by a grant from the National Research Foundation of Korea (NRF) , which was funded by the Korean government (Ministry of Education, Science, and Technology (MEST), Grant No. 2016R1A2A1A05005331 ). Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

month = feb,

doi = "10.1016/j.snb.2017.08.172",

language = "English",

volume = "255",

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T1 - Highly selective and sensitive detection of NO2 using rGO-In2O3 structure on flexible substrate at low temperature

AU - Na, Chan Woong

AU - Kim, Jae Hyeok

AU - Kim, Hyo Joong

AU - Woo, Hyung Sik

AU - Gupta, Arunava

AU - Kim, Han Ki

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by a grant from the National Research Foundation of Korea (NRF) , which was funded by the Korean government (Ministry of Education, Science, and Technology (MEST), Grant No. 2016R1A2A1A05005331 ). Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/2

Y1 - 2018/2

N2 - Reduced graphene oxide (rGO)-In2O3 hybrid materials were prepared by a solvothermal reaction of an In precursor containing rGO sheets, which were coated onto flexible substrates for gas sensors. The rGO-In2O3 flexible sensors showed a high and reversible response (resistance ratio = 22.3) to 500 ppb NO2 at 150 °C and negligible cross-responses to C2H5OH, CO, NH3, toluene, H2, and HCHO. The ultrahigh response and selectivity of rGO-In2O3 hybrid materials to NO2 were attributed to the chemical affinity of rGO to NO2 and the extension of the electron depletion layer in n-type In2O3 forming a p-n junction with the p-type rGO.

AB - Reduced graphene oxide (rGO)-In2O3 hybrid materials were prepared by a solvothermal reaction of an In precursor containing rGO sheets, which were coated onto flexible substrates for gas sensors. The rGO-In2O3 flexible sensors showed a high and reversible response (resistance ratio = 22.3) to 500 ppb NO2 at 150 °C and negligible cross-responses to C2H5OH, CO, NH3, toluene, H2, and HCHO. The ultrahigh response and selectivity of rGO-In2O3 hybrid materials to NO2 were attributed to the chemical affinity of rGO to NO2 and the extension of the electron depletion layer in n-type In2O3 forming a p-n junction with the p-type rGO.

KW - Gas sensors

KW - InO

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