Design of a highly sensitive and selective C 2H 5OH sensor using p-type Co 3O 4 nanofibers

Ji Wook Yoon; Joong Ki Choi; Jong Heun Lee

doi:10.1016/j.snb.2011.11.002

Design of a highly sensitive and selective C ₂H ₅OH sensor using p-type Co ₃O ₄ nanofibers

Ji Wook Yoon, Joong Ki Choi, Jong Heun Lee

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

134 Citations (Scopus)

Abstract

The Co ₃O ₄ nanofibers were prepared by electrospinning and their gas sensing characteristics were investigated. The Co ₃O ₄ sensors prepared by heat treatment of as-spun precursor fibers at 500 and 600 °C showed well-developed one-dimensional morphologies and exhibited high responses to 100 ppm C ₂H ₅OH (R _g/R _a = 51.2 and 45.3; R _g, resistance in gas; R _a, resistance in air) at 301 °C with negligible cross-responses to 100 ppm CO, C ₃H ₈, and H ₂ (R _g/R _a = 1.02-2.7). In contrast, the most of one-dimensional morphology of the Co ₃O ₄ specimen was lost and the response to 100 ppm C ₂H ₅OH became significantly lower when the heat treatment temperature was increased to 700 °C or when the nanofibers were ultrasonically disintegrated into primary particles. The significant decrease of the gas response was explained and discussed in relation to the gas sensing mechanism of a p-type semiconductor, the morphology of specimens, and the connecting configuration between nanoparticles and nanofibers.

Original language	English
Pages (from-to)	570-577
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	161
Issue number	1
DOIs	https://doi.org/10.1016/j.snb.2011.11.002
Publication status	Published - 2012 Jan 3

Keywords

Co O nanofibers
Electrospinning
Gas sensing mechanism
Gas sensor
p-type

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.2011.11.002

Cite this

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title = "Design of a highly sensitive and selective C 2H 5OH sensor using p-type Co 3O 4 nanofibers",

abstract = "The Co 3O 4 nanofibers were prepared by electrospinning and their gas sensing characteristics were investigated. The Co 3O 4 sensors prepared by heat treatment of as-spun precursor fibers at 500 and 600 °C showed well-developed one-dimensional morphologies and exhibited high responses to 100 ppm C 2H 5OH (R g/R a = 51.2 and 45.3; R g, resistance in gas; R a, resistance in air) at 301 °C with negligible cross-responses to 100 ppm CO, C 3H 8, and H 2 (R g/R a = 1.02-2.7). In contrast, the most of one-dimensional morphology of the Co 3O 4 specimen was lost and the response to 100 ppm C 2H 5OH became significantly lower when the heat treatment temperature was increased to 700 °C or when the nanofibers were ultrasonically disintegrated into primary particles. The significant decrease of the gas response was explained and discussed in relation to the gas sensing mechanism of a p-type semiconductor, the morphology of specimens, and the connecting configuration between nanoparticles and nanofibers.",

keywords = "Co O nanofibers, Electrospinning, Gas sensing mechanism, Gas sensor, p-type",

author = "Yoon, {Ji Wook} and Choi, {Joong Ki} 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 Ministry of Knowledge Economy . ",

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AU - Yoon, Ji Wook

AU - Choi, Joong Ki

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 Ministry of Knowledge Economy .

PY - 2012/1/3

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N2 - The Co 3O 4 nanofibers were prepared by electrospinning and their gas sensing characteristics were investigated. The Co 3O 4 sensors prepared by heat treatment of as-spun precursor fibers at 500 and 600 °C showed well-developed one-dimensional morphologies and exhibited high responses to 100 ppm C 2H 5OH (R g/R a = 51.2 and 45.3; R g, resistance in gas; R a, resistance in air) at 301 °C with negligible cross-responses to 100 ppm CO, C 3H 8, and H 2 (R g/R a = 1.02-2.7). In contrast, the most of one-dimensional morphology of the Co 3O 4 specimen was lost and the response to 100 ppm C 2H 5OH became significantly lower when the heat treatment temperature was increased to 700 °C or when the nanofibers were ultrasonically disintegrated into primary particles. The significant decrease of the gas response was explained and discussed in relation to the gas sensing mechanism of a p-type semiconductor, the morphology of specimens, and the connecting configuration between nanoparticles and nanofibers.

AB - The Co 3O 4 nanofibers were prepared by electrospinning and their gas sensing characteristics were investigated. The Co 3O 4 sensors prepared by heat treatment of as-spun precursor fibers at 500 and 600 °C showed well-developed one-dimensional morphologies and exhibited high responses to 100 ppm C 2H 5OH (R g/R a = 51.2 and 45.3; R g, resistance in gas; R a, resistance in air) at 301 °C with negligible cross-responses to 100 ppm CO, C 3H 8, and H 2 (R g/R a = 1.02-2.7). In contrast, the most of one-dimensional morphology of the Co 3O 4 specimen was lost and the response to 100 ppm C 2H 5OH became significantly lower when the heat treatment temperature was increased to 700 °C or when the nanofibers were ultrasonically disintegrated into primary particles. The significant decrease of the gas response was explained and discussed in relation to the gas sensing mechanism of a p-type semiconductor, the morphology of specimens, and the connecting configuration between nanoparticles and nanofibers.

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