The defect sites on chemical vapor deposition grown graphene are investigated through the selective electrochemical deposition (SED) of Au nanoparticles. For SED of Au nanoparticles, an engineered potential pulse is applied to the working electrode versus the reference electrode, thereby highlighting the defect sites, which are more reactive relative to the pristine surface. Most defect sites decorated by Au nanoparticles are situated along the Cu grain boundaries, implying that the origin of the defects lies in the synthesis of uneven graphene layers on the rough Cu surface.

• Hye-Mi So(National Nanofab Center)
• Jeong-Hun Mun(Department of Electrical Engineering, Korea Advanced Institute of Science and Technology)
• Gyeong-Sook Bang(National Nanofab Center)
• Taek-Yong Kim(Department of Electrical Engineering, Korea Advanced Institute of Science and Technology)
• Byung-Jin Cho(Department of Electrical Engineering, Korea Advanced Institute of Science and Technology) Corresponding Author
• Chi-Won Ahn(National Nanofab Center) Corresponding Author