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Issue 10, 2019
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Influence of hydrogen incorporation on conductivity and work function of VO2 nanowires

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Abstract

We report improved conductance by reducing the work function via incorporation of hydrogen into VO2 nanowires. The VO2 nanowires were prepared using the chemical vapor deposition method with V2O5 powder on silicon substrates at 850 °C. Hydrogenation was carried out using the high-pressure hydrogenation method. Raman spectroscopy confirmed that the incorporated hydrogen atoms resulted in a change in the lattice constant of the VO2 nanowires (NWs). To quantitatively measure the work function of the nanowires, Kelvin probe force microscopy (KPFM) was employed at ambient conditions. We found that the work function decreased with increasing H2 pressure, which also resulted in increased conductance. This is associated with hydrogen diffused into the VO2 that acts as a donor to elevate the Fermi level, which was also confirmed by KPFM. From these results, tuning of the reversible electrical properties of VO2 NWs, including the conductance and work function, can be achieved by incorporating hydrogen at relatively moderate temperatures.

Graphical abstract: Influence of hydrogen incorporation on conductivity and work function of VO2 nanowires

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Publication details

The article was received on 09 Jan 2019, accepted on 18 Feb 2019 and first published on 19 Feb 2019


Article type: Communication
DOI: 10.1039/C9NR00245F
Nanoscale, 2019,11, 4219-4225

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    Influence of hydrogen incorporation on conductivity and work function of VO2 nanowires

    J. Kim, J. Y. Shin, H. Jang, J. W. Jeon, W. G. Hong, H. J. Kim, J. Choi, G. Kim, B. H. Kim, J. Park, Y. J. Choi and J. Y. Park, Nanoscale, 2019, 11, 4219
    DOI: 10.1039/C9NR00245F

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