Selective trimethylamine sensors using Cr2O3- decorated SnO2 nanowires

Chang Hoon Kwak, Hyung Sik Woo, Jong Heun Lee

Research output: Contribution to journalArticle

49 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 languageEnglish
Pages (from-to)231-238
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume204
DOIs
Publication statusPublished - 2014 Dec 1

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Nanowires
nanowires
Gases
sensors
Sensors
gases
Thermal evaporation
Nanoclusters
nanoclusters
affinity
catalytic activity
Nanostructures
Catalyst activity
evaporation
coatings
Coatings
oxides
trimethylamine
configurations

ASJC Scopus subject areas

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

Cite this

Selective trimethylamine sensors using Cr2O3- decorated SnO2 nanowires. / Kwak, Chang Hoon; Woo, Hyung Sik; Lee, Jong Heun.

In: Sensors and Actuators, B: Chemical, Vol. 204, 01.12.2014, p. 231-238.

Research output: Contribution to journalArticle

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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.",
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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.

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