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Issue 21, 2014
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Substoichiometric two-dimensional molybdenum oxide flakes: a plasmonic gas sensing platform

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Abstract

Two-dimensional (2D) molybdenum oxides at their various stoichiometries are promising candidates for generating plasmon resonances in visible light range. Herein, we demonstrate plasmonic 2D molybdenum oxide flakes for gas sensing applications, in which hydrogen (H2) is selected as a model gas. The 2D molybdenum oxide flakes are obtained using a grinding-assisted liquid exfoliation method and exposed to simulated sunlight to acquire its substoichiometric quasi-metallic form. After the exposure to H2 gas molecules, the quasi-metallic molybdenum oxide flakes are partially transformed into semiconducting states, thus gradually losing their plasmonic properties. The novel 2D plasmonic sensing platform is tested using different concentrations of H2 gas at various operating temperatures to comprehensively assess its sensing performance. The presented 2D plasmonic system offers great opportunities for future sensing and optical applications.

Graphical abstract: Substoichiometric two-dimensional molybdenum oxide flakes: a plasmonic gas sensing platform

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Publication details

The article was received on 05 Jun 2014, accepted on 20 Aug 2014 and first published on 22 Aug 2014


Article type: Paper
DOI: 10.1039/C4NR03073G
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2014,6, 12780-12791
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    Substoichiometric two-dimensional molybdenum oxide flakes: a plasmonic gas sensing platform

    M. M. Y. A. Alsaif, M. R. Field, B. J. Murdoch, T. Daeneke, K. Latham, A. F. Chrimes, A. S. Zoolfakar, S. P. Russo, J. Z. Ou and K. Kalantar-zadeh, Nanoscale, 2014, 6, 12780
    DOI: 10.1039/C4NR03073G

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