nanomaterials Review A Review of Graphene-Based Surface Plasmon Resonance and Surface-Enhanced Raman Scattering Biosensors: Current Status and Future Prospects Devi Taufiq Nurrohman 1,2 and Nan-Fu Chiu 1,3,* 1 Laboratory of Nano-Photonics and Biosensors, Institute of Electro-Optic...