Gold on WSe2 Single Crystal Film as a Substrate for Surface Enhanced   Raman Scattering (SERS) Sensing
  Synthesis and characterization of high-quality single-crystal WSe2 films on highly-insulating substrate is presented. We demonstrate for the first time that the presence of gold nanoparticles in the basal plane of a WSe2 film can enhance its Raman scattering intensity. The experimentally observed enhancement ratio in the Raman signal correlates well with the simulated electric field intensity using a three-dimensional electromagnetic software and theoretical calculation. This work provides guidelines for the use of two-dimensional WSe2 films as a SERS substrate. 
Bablu Mukherjee, Wei Sun Leong, Yida Li, Hao Gong, Linfeng Sun, Ze   Xiang Shen, Ergun Simsek, and John T. L. Thong
cond-mat.mes-hall cond-mat.mtrl-sci