▎ 摘　　要

Isolated single metal atoms have attracted significant attention as catalytic materials with maximum surface areas as well as high activity and selectivity. However, a dense dispersion of single atoms on supported materials has not been achieved. We applied plasma sputtering in N-2 atmosphere to disperse single Pt atoms on graphene. Scanning transmission electron microscopy observations confirmed the high-density dispersion of single Pt atoms, without widespread sintering into three-dimensional nanoparticles. X-ray photoelectron spectroscopy measurements revealed that pyridinic nitrogen was selectively doped in graphene during the sputtering. Our novel method provides a simple approach to synthesize high-density single Pt atoms on graphene. (c) 2018 The Japan Society of Applied Physics