Thickness-Dependent Morphologies of Gold on N-Layer Graphenes
  We report that gold thermally deposited onto n-layer graphenes interacts differently with these substrates depending on the number layer, indicating the different surface properties of graphenes. This results in thickness-dependent morphologies of gold on n-layer graphenes, which can be used to identify and distinguish graphenes with high throughput and spatial resolution. This technique may play an important role in checking if n-layer graphenes are mixed with different layer numbers of graphene with a smaller size, which cannot be found by Raman spectra. The possible mechanisms for these observations are discussed. 
Haiqing Zhou, Caiyu Qiu, Zheng Liu, Huaichao Yang, Lijun Hu, Ji Liu,   Haifang Yang, Changzhi Gu, and Lianfeng Sun
physics.chem-ph