Cr-doped Co3O4 nanorods as chemiresistor for ultraselective monitoring of methyl benzene

Hyun Mook Jeong; Hyo Joong Kim; Prabhakar Rai; Ji Wook Yoon; Jong Heun Lee

doi:10.1016/j.snb.2014.05.038

Cr-doped Co₃O₄ nanorods as chemiresistor for ultraselective monitoring of methyl benzene

Hyun Mook Jeong, Hyo Joong Kim, Prabhakar Rai, Ji Wook Yoon, Jong Heun Lee

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

70 Citations (Scopus)

Abstract

Ultrasensitive and selective detection of methyl benzenes was achieved for Co₃O₄ nanorods through Cr-doping. Pure and 1.17-1.89 at% Cr-doped Co₃O₄ nanorods were synthesized by a solvothermal reaction, followed by calcination at 400 °C for 2 h. The gas-sensing properties of the nanorods were tested to methyl benzene (toluene and xylene) and compared with interfering gases (benzene, ethanol, ammonia, CO and NO ₂) at various concentrations (0.25-5 ppm) and temperatures (250-350 °C). The results demonstrated that Cr-doping significantly enhanced the response to methyl benzenes while suppressing cross-responses to interfering gases, resulting in selectivity for methyl benzene. The ultraselectivity to methyl benzene in the Cr-doped Co₃O₄ nanorods was attributed to catalytic activity and the abundant adsorbed oxygen of the Cr oxides and Co₃O₄ for the partial oxidation of methyl benzenes to more active chemical species.

Original language	English
Pages (from-to)	482-489
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	201
DOIs	https://doi.org/10.1016/j.snb.2014.05.038
Publication status	Published - 2014 Oct 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2013R1A2A101006545) and supported by Industrial Strategic Technology Development Program (No. 10047868) funded by the Ministry of Trade, Industry & Energy (KEIT). H. -M. Jeong was supported by Global Ph.D fellowship (No. 2012H1A2A1017604) funded by the NRF.

Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.

Keywords

Gas sensor
Selectivity
Toluene
Xylene

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.2014.05.038

Cite this

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title = "Cr-doped Co3O4 nanorods as chemiresistor for ultraselective monitoring of methyl benzene",

abstract = "Ultrasensitive and selective detection of methyl benzenes was achieved for Co3O4 nanorods through Cr-doping. Pure and 1.17-1.89 at% Cr-doped Co3O4 nanorods were synthesized by a solvothermal reaction, followed by calcination at 400 °C for 2 h. The gas-sensing properties of the nanorods were tested to methyl benzene (toluene and xylene) and compared with interfering gases (benzene, ethanol, ammonia, CO and NO 2) at various concentrations (0.25-5 ppm) and temperatures (250-350 °C). The results demonstrated that Cr-doping significantly enhanced the response to methyl benzenes while suppressing cross-responses to interfering gases, resulting in selectivity for methyl benzene. The ultraselectivity to methyl benzene in the Cr-doped Co3O4 nanorods was attributed to catalytic activity and the abundant adsorbed oxygen of the Cr oxides and Co3O4 for the partial oxidation of methyl benzenes to more active chemical species.",

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author = "Jeong, {Hyun Mook} and Kim, {Hyo Joong} and Prabhakar Rai and Yoon, {Ji Wook} and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2013R1A2A101006545) and supported by Industrial Strategic Technology Development Program (No. 10047868) funded by the Ministry of Trade, Industry & Energy (KEIT). H. -M. Jeong was supported by Global Ph.D fellowship (No. 2012H1A2A1017604) funded by the NRF. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",

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doi = "10.1016/j.snb.2014.05.038",

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AU - Rai, Prabhakar

AU - Yoon, Ji Wook

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2013R1A2A101006545) and supported by Industrial Strategic Technology Development Program (No. 10047868) funded by the Ministry of Trade, Industry & Energy (KEIT). H. -M. Jeong was supported by Global Ph.D fellowship (No. 2012H1A2A1017604) funded by the NRF. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.

PY - 2014/10/1

Y1 - 2014/10/1

N2 - Ultrasensitive and selective detection of methyl benzenes was achieved for Co3O4 nanorods through Cr-doping. Pure and 1.17-1.89 at% Cr-doped Co3O4 nanorods were synthesized by a solvothermal reaction, followed by calcination at 400 °C for 2 h. The gas-sensing properties of the nanorods were tested to methyl benzene (toluene and xylene) and compared with interfering gases (benzene, ethanol, ammonia, CO and NO 2) at various concentrations (0.25-5 ppm) and temperatures (250-350 °C). The results demonstrated that Cr-doping significantly enhanced the response to methyl benzenes while suppressing cross-responses to interfering gases, resulting in selectivity for methyl benzene. The ultraselectivity to methyl benzene in the Cr-doped Co3O4 nanorods was attributed to catalytic activity and the abundant adsorbed oxygen of the Cr oxides and Co3O4 for the partial oxidation of methyl benzenes to more active chemical species.

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