Enhanced performance of SnO2 nanowires ethanol sensor by functionalizing with La2O3

Nguyen Van Hieu; Hae Ryong Kim; Byeong Kwon Ju; Jong Heun Lee

doi:10.1016/j.snb.2008.02.018

Enhanced performance of SnO₂ nanowires ethanol sensor by functionalizing with La₂O₃

Nguyen Van Hieu, Hae Ryong Kim, Byeong Kwon Ju, Jong Heun Lee

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

130 Citations (Scopus)

Abstract

A SnO₂ nanowires (NWs) sensor was coated with a functional La₂O₃ layer by solution deposition and its gas sensing characteristics were compared with those of an uncoated SnO₂ NWs sensor. The responses (R_a/R_g, R_a: resistance in air, R_g: resistance in gas) of an undoped SnO₂ NWs sensor to 100 ppm C₂H₅OH and CH₃COCH₃ were 10.5 and 9.6, respectively, while those to 100 ppm C₃H₈, CO, and H₂ ranged from 3.1 to 3.3. The R_a/R_g values of the La₂O₃-coated SnO₂ NWs to 100 ppm C₂H₅OH and CH₃COCH₃ increased to 57.3 and 34.9, respectively, but there was no significant change in the responses to C₃H₈, CO, and H₂. The ∼5.5-fold enhancement in R_a/R_g to C₂H₅OH as well as the selective detection of C₂H₅OH in the interference gases such as C₃H₈, CO, and H₂ was accomplished simultaneously by coating with La₂O₃. In particular, the selective discrimination of C₂H₅OH over CH₃COCH₃, which is a difficult issue on account their similar chemical nature, was possible.

Original language	English
Pages (from-to)	228-234
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	133
Issue number	1
DOIs	https://doi.org/10.1016/j.snb.2008.02.018
Publication status	Published - 2008 Jul 28

Bibliographical note

Funding Information:
This work was supported in part by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (No. R01-2005-000-10648-0(2005)) and by the IT R&D program of MIC/IITA [2006-S-078-02, Environmental Sensing and Alerting System with Nano-wire and Nano-tube]. We thank for government for financial supports.

Keywords

Ethanol sensor
LaO
Selective detection
Sensitivity
SnO nanowires

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.2008.02.018

Cite this

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title = "Enhanced performance of SnO2 nanowires ethanol sensor by functionalizing with La2O3",

abstract = "A SnO2 nanowires (NWs) sensor was coated with a functional La2O3 layer by solution deposition and its gas sensing characteristics were compared with those of an uncoated SnO2 NWs sensor. The responses (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) of an undoped SnO2 NWs sensor to 100 ppm C2H5OH and CH3COCH3 were 10.5 and 9.6, respectively, while those to 100 ppm C3H8, CO, and H2 ranged from 3.1 to 3.3. The Ra/Rg values of the La2O3-coated SnO2 NWs to 100 ppm C2H5OH and CH3COCH3 increased to 57.3 and 34.9, respectively, but there was no significant change in the responses to C3H8, CO, and H2. The ∼5.5-fold enhancement in Ra/Rg to C2H5OH as well as the selective detection of C2H5OH in the interference gases such as C3H8, CO, and H2 was accomplished simultaneously by coating with La2O3. In particular, the selective discrimination of C2H5OH over CH3COCH3, which is a difficult issue on account their similar chemical nature, was possible.",

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author = "{Van Hieu}, Nguyen and Kim, {Hae Ryong} and Ju, {Byeong Kwon} and Lee, {Jong Heun}",

note = "Funding Information: This work was supported in part by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (No. R01-2005-000-10648-0(2005)) and by the IT R&D program of MIC/IITA [2006-S-078-02, Environmental Sensing and Alerting System with Nano-wire and Nano-tube]. We thank for government for financial supports. ",

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N1 - Funding Information: This work was supported in part by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (No. R01-2005-000-10648-0(2005)) and by the IT R&D program of MIC/IITA [2006-S-078-02, Environmental Sensing and Alerting System with Nano-wire and Nano-tube]. We thank for government for financial supports.

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N2 - A SnO2 nanowires (NWs) sensor was coated with a functional La2O3 layer by solution deposition and its gas sensing characteristics were compared with those of an uncoated SnO2 NWs sensor. The responses (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) of an undoped SnO2 NWs sensor to 100 ppm C2H5OH and CH3COCH3 were 10.5 and 9.6, respectively, while those to 100 ppm C3H8, CO, and H2 ranged from 3.1 to 3.3. The Ra/Rg values of the La2O3-coated SnO2 NWs to 100 ppm C2H5OH and CH3COCH3 increased to 57.3 and 34.9, respectively, but there was no significant change in the responses to C3H8, CO, and H2. The ∼5.5-fold enhancement in Ra/Rg to C2H5OH as well as the selective detection of C2H5OH in the interference gases such as C3H8, CO, and H2 was accomplished simultaneously by coating with La2O3. In particular, the selective discrimination of C2H5OH over CH3COCH3, which is a difficult issue on account their similar chemical nature, was possible.

AB - A SnO2 nanowires (NWs) sensor was coated with a functional La2O3 layer by solution deposition and its gas sensing characteristics were compared with those of an uncoated SnO2 NWs sensor. The responses (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) of an undoped SnO2 NWs sensor to 100 ppm C2H5OH and CH3COCH3 were 10.5 and 9.6, respectively, while those to 100 ppm C3H8, CO, and H2 ranged from 3.1 to 3.3. The Ra/Rg values of the La2O3-coated SnO2 NWs to 100 ppm C2H5OH and CH3COCH3 increased to 57.3 and 34.9, respectively, but there was no significant change in the responses to C3H8, CO, and H2. The ∼5.5-fold enhancement in Ra/Rg to C2H5OH as well as the selective detection of C2H5OH in the interference gases such as C3H8, CO, and H2 was accomplished simultaneously by coating with La2O3. In particular, the selective discrimination of C2H5OH over CH3COCH3, which is a difficult issue on account their similar chemical nature, was possible.

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