The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature
The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature
The detection of hazardous and toxic gases in homes and corporate world, with highly sensitive and selective manner continues to be of great interest. Therefore, we report on the gas sensing characteristics of NiO nanostructures with crystallite sizes of approximately 10–17 nm prepared by a co-precipitation method using various reaction times ranging from 2 to 24 h. The physical variation of the colour from green to black after heat treatment was observed due to non-stoichiometric property of NiO revealing blue emission, which was assigned to oxygen and/or nickel vacancies. The diffuse reflectance spectra revealed a wide direct band gap in the range of 3.4–3.6 eV. The high BET surface area ranging from 46 to 84 m(sup2)/g was witnessed. The NiO-8 h sensor revealed an excellent response of 74 towards 60 ppm of H(sub2)S at 75 °C in dry air. The detection limit of 0.013 and 1.6 ppm was observed for NiO-8 h based sensor in dry air and RH-40%, respectively. These findings specify that the NiO-8 h sensor has pronounced potential for applications in high-performance H(sub2)S gas sensor operating at low temperature. The underlying mechanism for the improved NiO-8 h sensing performance is debated.
Reference:
Mokoena, T.P,. Tshabalala, Z.P,. Hillie, K.T,. et al. 2020. The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature. Applied Surface Science, vol 525, pp. 1-19
Mokoena, T. P., Tshabalala, Z. P., Hillie, K. T., Swart, H., & Motaung, D. (2020). The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature. http://hdl.handle.net/10204/11608
Mokoena, Teboho P, Zamaswazi P Tshabalala, Kenneth T Hillie, HC Swart, and DE Motaung "The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature." (2020) http://hdl.handle.net/10204/11608
Mokoena TP, Tshabalala ZP, Hillie KT, Swart H, Motaung D. The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature. 2020; http://hdl.handle.net/10204/11608.
Copyright: 2020, Elsevier. Due to copyright restrictions, the attached PDF file contains the abstract of the full-text item. For access to the full-text item, please consult the publisher's website.
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