Kaito Kanahashi, Naoki Tanaka, Yoshiaki Shoji, Mina Maruyama, Il Jeon, Kenji Kawahara, Masatou Ishihara, Masataka Hasegawa, Hiromichi Ohta, Hiroki Ago, Yutaka Matsuo, Susumu Okada, Takanori Fukushima, and Taishi Takenobu*, “Formation of environmentally stable hole-doped graphene films: Instantaneous and high-density carrier doping by a boron-based oxidant” , npj 2D Materials and Applications 3, 7 (2019). Network Joint Research Center for Materials and Devices