Na Zhang, Kunyan Zhang, Min Zou, Rinu Abraham Maniyara, Timothy Andrew Bowen, Jonathon Ray Schrecengost, Arpit Jain, Da Zhou, Chengye Dong, Zhuohang Yu, He Liu, Noel C Giebink, Joshua A Robinson, Wei Hu, Shengxi Huang, Mauricio Terrones
Graphene-enhanced Raman scattering (GERS) offers great opportunities to achieve optical sensing with a high uniformity and superior molecular selectivity. The GERS mechanism relies on charge transfer between molecules and graphene, which is difficult to manipulate by varying the band alignment between graphene and the molecules. In this work, we synthesized a few atomic layers of metal termed two-dimensional (2D) metal to precisely and deterministically modify the graphene Fermi level. Using copper phthalocyanine (CuPc) as a representative molecule, we demonstrated that tuning the Fermi level can significantly improve the signal enhancement and molecular selectivity of GERS...
March 18, 2024: ACS Nano