Tuning the Doping Type and Level of Graphene with Different Gold Configurations |
| |
Authors: | Yaping Wu Wei Jiang Yujie Ren Weiwei Cai Wi Hyoung Lee Huifeng Li Richard D Piner Cody W Pope Yufeng Hao Hengxing Ji Junyong Kang Rodney S Ruoff |
| |
Affiliation: | 1. Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China;2. Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712, USA |
| |
Abstract: | 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). |
| |
Keywords: | electrical transport measurements first‐principle calculations doping type and level Raman shift transmission electron microscopy |
|
|