|
|||||
|
|
Graphene Grown from Flat and Bowl Shaped Polycyclic Aromatic Hydrocarbons on Cu(111) |
|
| Authors: | Dr. Jingyi Li Dr. Samuel Lampart Prof. Dr. Jay S. Siegel Prof. Dr. Karl-Heinz Ernst Dr. Christian Wäckerlin |
| Affiliation: | 1. Swiss Federal Laboratories for Materials Science and Technology, Überlandstr. 129, Dübendorf, Switzerland;2. Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;3. School of Pharmaceutical Science and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin-, 3000072 China;4. Swiss Federal Laboratories for Materials Science and Technology, Überlandstr. 129, Dübendorf, Switzerland Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 162 00 Praha 6, Czech Republic |
| Abstract: | The growth of carbon layers, defective graphene, and graphene by deposition of polycyclic aromatic hydrocarbons (PAHs) on Cu(111) is studied by scanning tunneling microscopy and X-ray photoelectron spectroscopy. Two different PAHs are used as starting materials: the buckybowl pentaindenocorannulene (PIC) which contains pentagonal rings and planar coronene (CR). For both precursors, with increasing sample temperature during deposition, porous carbon aggregates (350 °C), dense carbon layers (400–450 °C), disordered defective graphene (500 °C–550 °C), and extended graphene (≥600 °C) are obtained. No significant differences for defective graphene grown from PIC and CR are observed. C 1s X-ray photoelectron spectra of PIC and CR derived samples grown at 350–550 °C exhibit a characteristic C−Cu low binding energy component. Preparation at ≥600 °C eliminates this C−Cu species and only C−C bonded carbon remains. |
| Keywords: | graphene copper surface defective graphene scanning tunneling microscopy X-ray photoelectron spectroscopy |