Tuning the doping type and level of graphene with different gold configurations.
Tuning the doping type and level of graphene with different gold configurations.
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DOI：
10.1002/smll.201200520
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发表时间：
2012-10
期刊：
影响因子：
13.3
通讯作者：
Yaping Wu;Wei Jiang;Yujie Ren;Weiwei Cai;Wi Hyoung Lee;Huifeng Li;R. Piner;Cody W. Pope;Y. H
中科院分区：
文献类型：
--
作者：
Yaping Wu;Wei Jiang;Yujie Ren;Weiwei Cai;Wi Hyoung Lee;Huifeng Li;R. Piner;Cody W. Pope;Y. H
将Au纳米颗粒和薄膜沉积在清洁的石墨烯表面上以研究不同Au配置的掺杂效应。显微拉曼光谱表明，石墨烯的掺杂类型和水平都可以通过精细控制Au沉积来调节。通过透射电子显微镜对石墨烯上Au的形貌结构进行了成像，结果表明石墨烯具有与尺寸相关的电学特性：孤立的Au纳米颗粒产生石墨烯的n型掺杂，而连续的Au膜产生石墨烯的p型掺杂。因此，石墨烯场效应晶体管的制造，与原位测量表明可调的导电类型和水平，通过接触不同的Au配置。为了解释实验观察结果，第一性原理方法被用来模拟石墨烯-金系统内的相互作用。结果表明，不同的Au结构（孤立纳米颗粒和连续薄膜）与石墨烯之间的化学相互作用导致了Au-石墨烯体系的不同掺杂特性。
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 graphene-Au systems. The results suggest that, different doping properties of Au-graphene systems are induced by the chemical interactions between graphene and the different Au configurations (isolated nanoparticle and continuous film).