Graphene-based flexible SERS substrates with Ag nanohole structures for biochemical sensing - Takashi Uchino; Yanjun Heng; Ryoma Kumagai; Shigenobu Kasai; Chao Tang; Hirokazu Fukidome; Akira Satou; Taiichi Otsuji; Shuji Ikeda (Next Nanotechnology, 2026)