Influence of hydrogen incorporation on conductivity and work function of VO 2 nanowires

Jeong Young Park, Jae Eun Kim, Jung Yeol Shin, Hyun Seok Jang, Jun Woo Jeon, Won G. Hong, Hae Jin Kim, Junhee Choi, Gyu-Tae Kim, Byung Hoon Kim, Jonghyurk Park, Young Jin Choi

Research output: Contribution to journalArticle

Abstract

We report improved conductance by reducing the work function via incorporation of hydrogen into VO 2 nanowires. The VO 2 nanowires were prepared using the chemical vapor deposition method with V 2 O 5 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 VO 2 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 H 2 pressure, which also resulted in increased conductance. This is associated with hydrogen diffused into the VO 2 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 VO 2 NWs, including the conductance and work function, can be achieved by incorporating hydrogen at relatively moderate temperatures.

Original languageEnglish
Pages (from-to)4219-4225
Number of pages7
JournalNanoscale
Volume11
Issue number10
DOIs
Publication statusPublished - 2019 Mar 14

ASJC Scopus subject areas

  • Materials Science(all)

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    Park, J. Y., Kim, J. E., Shin, J. Y., Jang, H. S., Jeon, J. W., Hong, W. G., Kim, H. J., Choi, J., Kim, G-T., Kim, B. H., Park, J., & Choi, Y. J. (2019). Influence of hydrogen incorporation on conductivity and work function of VO 2 nanowires Nanoscale, 11(10), 4219-4225. https://doi.org/10.1039/c9nr00245f