Journal
SMALL
Volume 8, Issue 20, Pages 3129-3136Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201200520
Keywords
electrical transport measurements; first-principle calculations; doping type and level; Raman shift; transmission electron microscopy
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Funding
- National 973 Program of China [2012CB619301, 2011CB925600]
- National Natural Science Foundation of China [90921002, 60827004]
- National Science Foundation [1006350]
- Office of Naval Research, SWAN NRI
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006350] Funding Source: National Science Foundation
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Au nanoparticles and films are deposited onto clean graphene surfaces to study the doping effect of different Au configurations. Micro-Raman spectra show that both the doping type and level of graphene can be tuned by fine control of the Au deposition. The morphological structures of Au on graphene are imaged by transmission electron microscopy, which indicate a size-dependent electrical characteristic: isolated Au nanoparticles produce n-type doping of graphene, while continuous Au films produce p-type doping. Accordingly, graphene field-effect transistors are fabricated, with the in situ measurements suggesting the tunable conductivity type and level by contacting with different Au configurations. For interpreting the experimental observations, the first-principles approach is used to simulate the interaction within grapheneAu systems. The results suggest that, different doping properties of Augraphene systems are induced by the chemical interactions between graphene and the different Au configurations (isolated nanoparticle and continuous film).
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