Ultraselective and sensitive detection of xylene and toluene for monitoring indoor air pollution using Cr-doped NiO hierarchical nanostructures.

Hyo Joong Kim, Ji Wook Yoon, Kwon Il Choi, Ho Won Jang, Ahmad Umar, Jong Heun Lee

Research output: Contribution to journalArticle

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Abstract

Ultraselective and sensitive detection of xylene and toluene with minimum interferences of other indoor air pollutants such as benzene, ethanol, and formaldehyde is achieved using NiO hierarchical nanostructures doped with Cr. Pure and 1.15-2.56 at% Cr-doped NiO flower-like hierarchical nanostructures assembled from nanosheets are prepared by a simple solvothermal reaction and their gas sensing characteristics toward o-xylene and toluene gases are investigated. The 1.15 at% Cr-doped NiO hierarchical nanostructures show high responses to 5 ppm of o-xylene and toluene (ratio of resistance to gas and air = 11.61 and 7.81, respectively) and negligible cross-responses to 5 ppm of benzene, formaldehyde, ethanol, hydrogen, and carbon monoxide. However, pure NiO nanostructures show low responses to 5 ppm of o-xylene and toluene (ratio of resistance to gas and air = 2.01 and 1.14, respectively) and no selectivity toward any specific gas is observed. Significant enhancement of the response and selectivity to o-xylene and toluene is attributed to the decrease in the hole concentration in NiO and the catalytic oxidation of methyl groups by Cr doping.

Original languageEnglish
Pages (from-to)7066-7073
Number of pages8
JournalNanoscale
Volume5
Issue number15
Publication statusPublished - 2013 Aug 7

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Indoor air pollution
Xylenes
Toluene
Xylene
Nanostructures
Gases
Monitoring
Benzene
Formaldehyde
Ethanol
Air
Hole concentration
Air Pollutants
Nanosheets
Catalytic oxidation
Carbon Monoxide
Carbon monoxide
Hydrogen
Doping (additives)
2-xylene

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Ultraselective and sensitive detection of xylene and toluene for monitoring indoor air pollution using Cr-doped NiO hierarchical nanostructures. / Kim, Hyo Joong; Yoon, Ji Wook; Choi, Kwon Il; Jang, Ho Won; Umar, Ahmad; Lee, Jong Heun.

In: Nanoscale, Vol. 5, No. 15, 07.08.2013, p. 7066-7073.

Research output: Contribution to journalArticle

Kim, Hyo Joong ; Yoon, Ji Wook ; Choi, Kwon Il ; Jang, Ho Won ; Umar, Ahmad ; Lee, Jong Heun. / Ultraselective and sensitive detection of xylene and toluene for monitoring indoor air pollution using Cr-doped NiO hierarchical nanostructures. In: Nanoscale. 2013 ; Vol. 5, No. 15. pp. 7066-7073.
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