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 journalArticle

52 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 languageEnglish
Pages (from-to)482-489
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume201
DOIs
Publication statusPublished - 2014 Oct 1

Fingerprint

Toluene
Nanorods
nanorods
Benzene
benzene
Monitoring
Gases
Doping (additives)
gases
Xylenes
xylene
Carbon Monoxide
Xylene
Ammonia
Calcination
roasting
Oxides
toluene
catalytic activity
ammonia

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Instrumentation

Cite this

Cr-doped Co3O4 nanorods as chemiresistor for ultraselective monitoring of methyl benzene. / Jeong, Hyun Mook; Kim, Hyo Joong; Rai, Prabhakar; Yoon, Ji Wook; Lee, Jong Heun.

In: Sensors and Actuators, B: Chemical, Vol. 201, 01.10.2014, p. 482-489.

Research output: Contribution to journalArticle

Jeong, Hyun Mook ; Kim, Hyo Joong ; Rai, Prabhakar ; Yoon, Ji Wook ; Lee, Jong Heun. / Cr-doped Co3O4 nanorods as chemiresistor for ultraselective monitoring of methyl benzene. In: Sensors and Actuators, B: Chemical. 2014 ; Vol. 201. pp. 482-489.
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