Selective trimethylamine sensors using Cr2O3- decorated SnO2 nanowires

Chang Hoon Kwak; Hyung Sik Woo; Jong Heun Lee

doi:10.1016/j.snb.2014.07.084

Selective trimethylamine sensors using Cr₂O₃- decorated SnO₂ nanowires

Chang Hoon Kwak, Hyung Sik Woo, Jong Heun Lee

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

80 Citations (Scopus)

Abstract

Pristine SnO₂ nanowires (NWs), Cr₂O ₃-decorated SnO₂ NWs, and SnO₂-Cr ₂O₃ core-shell nanocables (NCs) were prepared by thermal evaporation, and their gas-sensing characteristics were investigated. The decoration of discrete p-type Cr₂O₃ nanoclusters on SnO₂ NWs increased their response to trimethylamine (TMA). Highly sensitive and selective detection of TMA was attributed to the chemical affinity and catalytic activity of Cr₂O₃ toward TMA. In contrast, the SnO₂-Cr₂O₃ NCs, formed by the coating of a continuous p-type Cr₂O₃ overlayer on SnO₂ NWs, showed negligibly low responses to all analyte gases used. The variations in gas-sensing characteristics due to configuration changes in one-dimensional SnO₂-Cr₂O₃ hetero-nanostructures are explained and discussed in relation to the gas-sensing mechanisms of n- and p-type oxide semiconductors.

Original language	English
Pages (from-to)	231-238
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	204
DOIs	https://doi.org/10.1016/j.snb.2014.07.084
Publication status	Published - 2014 Dec 1

Keywords

Gas sensor
Selective detection
Trimethylamine

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

Access to Document

10.1016/j.snb.2014.07.084

Cite this

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title = "Selective trimethylamine sensors using Cr2O3- decorated SnO2 nanowires",

abstract = "Pristine SnO2 nanowires (NWs), Cr2O 3-decorated SnO2 NWs, and SnO2-Cr 2O3 core-shell nanocables (NCs) were prepared by thermal evaporation, and their gas-sensing characteristics were investigated. The decoration of discrete p-type Cr2O3 nanoclusters on SnO2 NWs increased their response to trimethylamine (TMA). Highly sensitive and selective detection of TMA was attributed to the chemical affinity and catalytic activity of Cr2O3 toward TMA. In contrast, the SnO2-Cr2O3 NCs, formed by the coating of a continuous p-type Cr2O3 overlayer on SnO2 NWs, showed negligibly low responses to all analyte gases used. The variations in gas-sensing characteristics due to configuration changes in one-dimensional SnO2-Cr2O3 hetero-nanostructures are explained and discussed in relation to the gas-sensing mechanisms of n- and p-type oxide semiconductors.",

keywords = "Gas sensor, Selective detection, Trimethylamine",

author = "Kwak, {Chang Hoon} and Woo, {Hyung Sik} and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2013R1A2A1A01006545 ). ",

year = "2014",

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doi = "10.1016/j.snb.2014.07.084",

language = "English",

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T1 - Selective trimethylamine sensors using Cr2O3- decorated SnO2 nanowires

AU - Kwak, Chang Hoon

AU - Woo, Hyung Sik

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2013R1A2A1A01006545 ).

PY - 2014/12/1

Y1 - 2014/12/1

N2 - Pristine SnO2 nanowires (NWs), Cr2O 3-decorated SnO2 NWs, and SnO2-Cr 2O3 core-shell nanocables (NCs) were prepared by thermal evaporation, and their gas-sensing characteristics were investigated. The decoration of discrete p-type Cr2O3 nanoclusters on SnO2 NWs increased their response to trimethylamine (TMA). Highly sensitive and selective detection of TMA was attributed to the chemical affinity and catalytic activity of Cr2O3 toward TMA. In contrast, the SnO2-Cr2O3 NCs, formed by the coating of a continuous p-type Cr2O3 overlayer on SnO2 NWs, showed negligibly low responses to all analyte gases used. The variations in gas-sensing characteristics due to configuration changes in one-dimensional SnO2-Cr2O3 hetero-nanostructures are explained and discussed in relation to the gas-sensing mechanisms of n- and p-type oxide semiconductors.

AB - Pristine SnO2 nanowires (NWs), Cr2O 3-decorated SnO2 NWs, and SnO2-Cr 2O3 core-shell nanocables (NCs) were prepared by thermal evaporation, and their gas-sensing characteristics were investigated. The decoration of discrete p-type Cr2O3 nanoclusters on SnO2 NWs increased their response to trimethylamine (TMA). Highly sensitive and selective detection of TMA was attributed to the chemical affinity and catalytic activity of Cr2O3 toward TMA. In contrast, the SnO2-Cr2O3 NCs, formed by the coating of a continuous p-type Cr2O3 overlayer on SnO2 NWs, showed negligibly low responses to all analyte gases used. The variations in gas-sensing characteristics due to configuration changes in one-dimensional SnO2-Cr2O3 hetero-nanostructures are explained and discussed in relation to the gas-sensing mechanisms of n- and p-type oxide semiconductors.

KW - Gas sensor

KW - Selective detection

KW - Trimethylamine

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