Enhanced CO sensing characteristics of hierarchical and hollow In2O3 microspheres

Kwon Il Choi; Hae Ryong Kim; Jong Heun Lee

doi:10.1016/j.snb.2009.02.016

Enhanced CO sensing characteristics of hierarchical and hollow In₂O₃ microspheres

Kwon Il Choi, Hae Ryong Kim, Jong Heun Lee

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

133 Citations (Scopus)

Abstract

Hierarchical and hollow In₂O₃ microspheres were prepared by a solvothermal self-assembly reaction and their CO sensing characteristics were compared to those of an agglomerated counterpart. Upon exposure to 10-50 ppm CO at 400 °C, the gas responses (R_a/R_g; R_a: resistance in air, R_g: resistance in gas) of the hierarchical and hollow structures were 1.6-2.7 times higher than that of the agglomerated sample. In addition, their 90% responses and recovery speeds were 23 times and 7.7 times higher, respectively. Their significantly improved gas responses and sensing/recovery kinetics were concluded to be related to the nanoporous and well-aligned nanostructures, which allow effective and rapid gas diffusion toward the sensing surfaces.

Original language	English
Pages (from-to)	497-503
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	138
Issue number	2
DOIs	https://doi.org/10.1016/j.snb.2009.02.016
Publication status	Published - 2009 May 6

Bibliographical 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 by a project, “Technologies development for future home appliance,” funded by Ministry of Knowledge Economy.

Keywords

Gas sensing kinetics
Hierarchical nanostructures
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.2009.02.016

Cite this

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title = "Enhanced CO sensing characteristics of hierarchical and hollow In2O3 microspheres",

abstract = "Hierarchical and hollow In2O3 microspheres were prepared by a solvothermal self-assembly reaction and their CO sensing characteristics were compared to those of an agglomerated counterpart. Upon exposure to 10-50 ppm CO at 400 °C, the gas responses (Ra/Rg; Ra: resistance in air, Rg: resistance in gas) of the hierarchical and hollow structures were 1.6-2.7 times higher than that of the agglomerated sample. In addition, their 90% responses and recovery speeds were 23 times and 7.7 times higher, respectively. Their significantly improved gas responses and sensing/recovery kinetics were concluded to be related to the nanoporous and well-aligned nanostructures, which allow effective and rapid gas diffusion toward the sensing surfaces.",

keywords = "Gas sensing kinetics, Hierarchical nanostructures, Hollow spheres, InO",

author = "Choi, {Kwon Il} and Kim, {Hae Ryong} 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 by a project, “Technologies development for future home appliance,” funded by Ministry of Knowledge Economy. ",

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AU - Choi, Kwon Il

AU - Kim, Hae Ryong

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 by a project, “Technologies development for future home appliance,” funded by Ministry of Knowledge Economy.

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N2 - Hierarchical and hollow In2O3 microspheres were prepared by a solvothermal self-assembly reaction and their CO sensing characteristics were compared to those of an agglomerated counterpart. Upon exposure to 10-50 ppm CO at 400 °C, the gas responses (Ra/Rg; Ra: resistance in air, Rg: resistance in gas) of the hierarchical and hollow structures were 1.6-2.7 times higher than that of the agglomerated sample. In addition, their 90% responses and recovery speeds were 23 times and 7.7 times higher, respectively. Their significantly improved gas responses and sensing/recovery kinetics were concluded to be related to the nanoporous and well-aligned nanostructures, which allow effective and rapid gas diffusion toward the sensing surfaces.

AB - Hierarchical and hollow In2O3 microspheres were prepared by a solvothermal self-assembly reaction and their CO sensing characteristics were compared to those of an agglomerated counterpart. Upon exposure to 10-50 ppm CO at 400 °C, the gas responses (Ra/Rg; Ra: resistance in air, Rg: resistance in gas) of the hierarchical and hollow structures were 1.6-2.7 times higher than that of the agglomerated sample. In addition, their 90% responses and recovery speeds were 23 times and 7.7 times higher, respectively. Their significantly improved gas responses and sensing/recovery kinetics were concluded to be related to the nanoporous and well-aligned nanostructures, which allow effective and rapid gas diffusion toward the sensing surfaces.

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