Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 20, Pages 3965-3971Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc00219a
Keywords
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Funding
- National Science Foundation of China [51132005, 51173097, 91333109]
- National Key Basic Research Program of China [2013CB632900]
- Tsinghua National Laboratory for Information Science and Technology (TN List) Cross-discipline Foundation
- Tsinghua University Initiative Scientific Research Program
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A graphene/patterned ZnO (G/PZO) nanorod array composite was successfully fabricated by using the colloidal nanosphere monolayer templating strategy. Compared with graphene/compact ZnO (G/CZO) nanorod arrays, the G/PZO nanorod array composite exhibited a highly efficient and stable field emission with a low turn-on field. The field emission had a strong dependence on the density and the inter-distance of the emitters. By changing the diameter of polystyrene (PS) colloidal nanospheres, optimal emitter inter-distance was obtained. Graphene supported on ZnO nanorod arrays, patterned by an 886 nm PS colloidal nanosphere monolayer, displayed the best field emission with a turn-on electric field of only 6.4 V mu m (1) and the field enhancement factor beta was 1158. The K point in the Fowler-Nordheim plot demonstrated the electron tunneling mechanism took place in this composite material. The cyclic experiment showed that the field emission of the G/PZO nanorod array composite was of high stability.
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