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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Ultraselective and sensitive detection of xylene and toluene for monitoring indoor air pollution using Cr-doped NiO hierarchical nanostructures
Nanoscale, Volume 5, No. 15, Year 2013
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Description
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. © 2013 The Royal Society of Chemistry.
Authors & Co-Authors
Kim, Hyo Joong
South Korea, Seoul
Korea University
Yoon, Ji Wook
South Korea, Seoul
Korea University
Choi, Kwon Il
South Korea, Seoul
Korea University
Jang, Ho Won
South Korea, Seoul
Seoul National University
Umar, Ahmad S.
Saudi Arabia, Najran
Najran University
Lee, Jong-heun
South Korea, Seoul
Korea University
Statistics
Citations: 210
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1039/c3nr01281f
ISSN:
20403364
e-ISSN:
20403372
Research Areas
Environmental