Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 35, Pages 13458-13463Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm12224j
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Funding
- National Research Foundation [NRF2010-0009545, NRF2010-0015975]
- Korean Government (MOEHRD) [KRF-2008-005-J00501]
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A novel hierarchical heteronanostructure of ZnO nanowires/WOx nanowhiskers was fabricated using a simple two-step process called the thermal evaporation and solution reaction. A high density of thin ZnO nanowires was uniformly deposited on a WOx nanowhisker backbone. The density and morphology of the ZnO nanowires were observed to be tunable as a function of reaction parameters, such as reaction time, growth temperature and solution composition. A solution-mediated solid ( SS) growth mechanism was proposed for the formation of the ZnO/WOx hierarchical heteronanostructures. The developed schematic model is consistent with the experimental results as shown in SEM and TEM analyses. Our hierarchical ZnO/WOx heteronanostructures demonstrated enhanced field electron emission properties in comparison to pristine WOx nanowhiskers. The turn-on-field voltage and field enhancement factor were comparable to other nanostructured materials, suggesting that ZnO/WOx hierarchical nanostructures are promising electron emitters in future field emission devices.
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