Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 3, Pages 1219-1224Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am201306c
Keywords
graphene; electrophoretic deposition; cesium iodide; coating; field emission
Funding
- NSFC [60071043]
- Doctor Station Foundation of the Ministry of Education of China [200806140007]
- Prestudy Foundation of Electronic Science Academic
- National Key Laboratory of Science and Technology on Vacuum Electronics
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Because of the large quantities of edges, grapheae can serve as an efficient edge emitter for field emission (FE). Cesium iodide (CsI) coating was promising to enhance the electron emission and utilized in FE applications. In this work, FE of graphene sheets after electrophoretic deposition (ED) was studied. Electron emission property of GS was obviously improved by coating with CsI. The turn-on field of GS decreased from 4.4 to 2.5 V/mu m; and threshold field decreased from 9 to 5.8 V/mu m, respectively. This FE improvement must due to a higher effective density of emission site generated around the GS surface after coating. Scanning electron microscopy (SEM) and computation were taken to reveal the influence after coating. Investigations of CsI coated MWCNTs were also compared in order to better understand the origin of the low turn-on electric field obtained by GS.
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