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

128 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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Kim, H. R., Choi, K. I., Lee, J. H., & Akbar, S. A. (2009). Highly sensitive and ultra-fast responding gas sensors using self-assembled hierarchical SnO₂ spheres. Sensors and Actuators, B: Chemical, 136(1), 138-143. https://doi.org/10.1016/j.snb.2008.11.016

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