Highly sensitive and ultra-fast responding gas sensors using self-assembled hierarchical SnO2 spheres

Hae Ryong Kim; Kwon Il Choi; Jong Heun Lee; Sheikh A. Akbar

doi:10.1016/j.snb.2008.11.016

Highly sensitive and ultra-fast responding gas sensors using self-assembled hierarchical SnO₂ spheres

Hae Ryong Kim, Kwon Il Choi, Jong Heun Lee, Sheikh A. Akbar

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

130 Citations (Scopus)

Abstract

The Sn₃O₄ hierarchical microspheres self-assembled from nanosheets were prepared by a hydrothermal reaction of aqueous solution containing SnCl₂·2H₂O, H₂C₂O₄, HCl, and N₂H₄·H₂O, which were successfully transformed into nano-porous SnO₂ hierarchical microspheres for gas sensor applications by heat treatment at 600 °C. The morphology of building blocks within the SnO₂ hierarchical spheres could be manipulated from 0-dimensional nanoparticles to 2-dimensional nanosheets by varying the amount of H₂C₂O₄ and N₂H₄·H₂O. The SnO₂ hierarchical spheres showed both the ultra-fast response (∼1 s) and high sensitivity to 50 ppm C₂H₅OH. The dramatic improvement in gas sensing characteristics was explained by the rapid diffusion of the target gas onto the entire sensing materials through the nano-porous network of nanosheets.

Original language	English
Pages (from-to)	138-143
Number of pages	6
Journal	Sensors and Actuators, B: Chemical
Volume	136
Issue number	1
DOIs	https://doi.org/10.1016/j.snb.2008.11.016
Publication status	Published - 2009 Feb 2

Keywords

Fast response
Gas sensors
Hierarchical spheres
Hydrothermal synthesis
SnO

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

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title = "Highly sensitive and ultra-fast responding gas sensors using self-assembled hierarchical SnO2 spheres",

abstract = "The Sn3O4 hierarchical microspheres self-assembled from nanosheets were prepared by a hydrothermal reaction of aqueous solution containing SnCl2·2H2O, H2C2O4, HCl, and N2H4·H2O, which were successfully transformed into nano-porous SnO2 hierarchical microspheres for gas sensor applications by heat treatment at 600 °C. The morphology of building blocks within the SnO2 hierarchical spheres could be manipulated from 0-dimensional nanoparticles to 2-dimensional nanosheets by varying the amount of H2C2O4 and N2H4·H2O. The SnO2 hierarchical spheres showed both the ultra-fast response (∼1 s) and high sensitivity to 50 ppm C2H5OH. The dramatic improvement in gas sensing characteristics was explained by the rapid diffusion of the target gas onto the entire sensing materials through the nano-porous network of nanosheets.",

keywords = "Fast response, Gas sensors, Hierarchical spheres, Hydrothermal synthesis, SnO",

author = "Kim, {Hae Ryong} and Choi, {Kwon Il} and Lee, {Jong Heun} and Akbar, {Sheikh A.}",

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

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AU - Akbar, Sheikh A.

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

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N2 - The Sn3O4 hierarchical microspheres self-assembled from nanosheets were prepared by a hydrothermal reaction of aqueous solution containing SnCl2·2H2O, H2C2O4, HCl, and N2H4·H2O, which were successfully transformed into nano-porous SnO2 hierarchical microspheres for gas sensor applications by heat treatment at 600 °C. The morphology of building blocks within the SnO2 hierarchical spheres could be manipulated from 0-dimensional nanoparticles to 2-dimensional nanosheets by varying the amount of H2C2O4 and N2H4·H2O. The SnO2 hierarchical spheres showed both the ultra-fast response (∼1 s) and high sensitivity to 50 ppm C2H5OH. The dramatic improvement in gas sensing characteristics was explained by the rapid diffusion of the target gas onto the entire sensing materials through the nano-porous network of nanosheets.

AB - The Sn3O4 hierarchical microspheres self-assembled from nanosheets were prepared by a hydrothermal reaction of aqueous solution containing SnCl2·2H2O, H2C2O4, HCl, and N2H4·H2O, which were successfully transformed into nano-porous SnO2 hierarchical microspheres for gas sensor applications by heat treatment at 600 °C. The morphology of building blocks within the SnO2 hierarchical spheres could be manipulated from 0-dimensional nanoparticles to 2-dimensional nanosheets by varying the amount of H2C2O4 and N2H4·H2O. The SnO2 hierarchical spheres showed both the ultra-fast response (∼1 s) and high sensitivity to 50 ppm C2H5OH. The dramatic improvement in gas sensing characteristics was explained by the rapid diffusion of the target gas onto the entire sensing materials through the nano-porous network of nanosheets.

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