Enhanced C2H5OH sensing characteristics of nano-porous In2O3 hollow spheres prepared by sucrose-mediated hydrothermal reaction

Sun Jung Kim; In Sung Hwang; Joong Ki Choi; Yun Chan Kang; Jong Heun Lee

doi:10.1016/j.snb.2010.12.055

Enhanced C₂H₅OH sensing characteristics of nano-porous In₂O₃ hollow spheres prepared by sucrose-mediated hydrothermal reaction

Sun Jung Kim, In Sung Hwang, Joong Ki Choi, Yun Chan Kang, Jong Heun Lee

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

84 Citations (Scopus)

Abstract

In₂O₃ hollow spheres with shell thicknesses of ∼150 nm and ∼300 nm were prepared by the one-pot synthesis of indium-precursor-coated carbon spheres via hydrothermal reaction and subsequent removal of core carbon by heat treatment. The gas response (R_a/R _g, R_a: resistance in air, R_g: resistance in gas) of the thin hollow spheres to 100 ppm C₂H₅OH was 137.2 at 400 °C, which was 1.86 and 3.84 times higher than that of the thick hollow spheres and of the nanopowders prepared by precipitation, respectively. The gas sensing characteristics are discussed in relation to the shell configuration of the hollow spheres. The enhanced gas response of the hollow spheres was attributed to the effective diffusion of analyte gas toward the entire sensor surface via very thin and nano-porous shells.

Original language	English
Pages (from-to)	512-518
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	155
Issue number	2
DOIs	https://doi.org/10.1016/j.snb.2010.12.055
Publication status	Published - 2011 Jul 20

Keywords

CH OH sensors
Gas sensors
Hollow spheres
InO

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.2010.12.055

Cite this

@article{c728770a4dc049ceac1a5cf13f71eca4,

title = "Enhanced C2H5OH sensing characteristics of nano-porous In2O3 hollow spheres prepared by sucrose-mediated hydrothermal reaction",

abstract = "In2O3 hollow spheres with shell thicknesses of ∼150 nm and ∼300 nm were prepared by the one-pot synthesis of indium-precursor-coated carbon spheres via hydrothermal reaction and subsequent removal of core carbon by heat treatment. The gas response (Ra/R g, Ra: resistance in air, Rg: resistance in gas) of the thin hollow spheres to 100 ppm C2H5OH was 137.2 at 400 °C, which was 1.86 and 3.84 times higher than that of the thick hollow spheres and of the nanopowders prepared by precipitation, respectively. The gas sensing characteristics are discussed in relation to the shell configuration of the hollow spheres. The enhanced gas response of the hollow spheres was attributed to the effective diffusion of analyte gas toward the entire sensor surface via very thin and nano-porous shells.",

keywords = "CH OH sensors, Gas sensors, Hollow spheres, InO",

author = "Kim, {Sun Jung} and Hwang, {In Sung} and Choi, {Joong Ki} and Kang, {Yun Chan} and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by KOSEF NRL program grant funded by the Korean government (MEST) (No. R0A-2008-000-20032-0 ) and the Fundamental R&D program for Core Technology of Materials ( M2008010013 ) funded by the Ministry of Knowledge Economy. ",

year = "2011",

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doi = "10.1016/j.snb.2010.12.055",

language = "English",

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pages = "512--518",

journal = "Sensors and Actuators, B: Chemical",

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T1 - Enhanced C2H5OH sensing characteristics of nano-porous In2O3 hollow spheres prepared by sucrose-mediated hydrothermal reaction

AU - Kim, Sun Jung

AU - Hwang, In Sung

AU - Choi, Joong Ki

AU - Kang, Yun Chan

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by KOSEF NRL program grant funded by the Korean government (MEST) (No. R0A-2008-000-20032-0 ) and the Fundamental R&D program for Core Technology of Materials ( M2008010013 ) funded by the Ministry of Knowledge Economy.

PY - 2011/7/20

Y1 - 2011/7/20

N2 - In2O3 hollow spheres with shell thicknesses of ∼150 nm and ∼300 nm were prepared by the one-pot synthesis of indium-precursor-coated carbon spheres via hydrothermal reaction and subsequent removal of core carbon by heat treatment. The gas response (Ra/R g, Ra: resistance in air, Rg: resistance in gas) of the thin hollow spheres to 100 ppm C2H5OH was 137.2 at 400 °C, which was 1.86 and 3.84 times higher than that of the thick hollow spheres and of the nanopowders prepared by precipitation, respectively. The gas sensing characteristics are discussed in relation to the shell configuration of the hollow spheres. The enhanced gas response of the hollow spheres was attributed to the effective diffusion of analyte gas toward the entire sensor surface via very thin and nano-porous shells.

AB - In2O3 hollow spheres with shell thicknesses of ∼150 nm and ∼300 nm were prepared by the one-pot synthesis of indium-precursor-coated carbon spheres via hydrothermal reaction and subsequent removal of core carbon by heat treatment. The gas response (Ra/R g, Ra: resistance in air, Rg: resistance in gas) of the thin hollow spheres to 100 ppm C2H5OH was 137.2 at 400 °C, which was 1.86 and 3.84 times higher than that of the thick hollow spheres and of the nanopowders prepared by precipitation, respectively. The gas sensing characteristics are discussed in relation to the shell configuration of the hollow spheres. The enhanced gas response of the hollow spheres was attributed to the effective diffusion of analyte gas toward the entire sensor surface via very thin and nano-porous shells.

KW - CH OH sensors

KW - Gas sensors

KW - Hollow spheres

KW - InO

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