Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Poster Monday: 2D Materials 1
O 18.9: Poster
Monday, September 5, 2022, 18:00–20:00, P4
Identification of electronic structures and atomic configuration of Nitrogen defects on graphene/Pt(111) — •Jeong Ah Seo1,2, Hyunmin Kang3,4, Young Jae Song3,4, Jungseok Chae1, and Andreas J. Heinrich1,2 — 1Center for Quantum Nanoscience, Institute for Basic Science, Seoul, Korea — 2Department of Physics, Ewha Womans University, Seoul, Korea — 3Department of Nano Engineering, Sungkyunkwan University (SKKU), Suwon, Korea — 4SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University (SKKU), Suwon, Korea
Nitrogen doped graphene is considered as an effective method for modulating the electronic states and properties of graphene. We have prepared nitrogen doped graphene on Pt(111) surface, grown by deposition of pyridine precursor molecules. We figured out there exist several types of defects including graphitic nitrogen and pyridinic nitrogen structure. The imaging of the defects is performed using low temperature scanning tunneling microscope (STM) and atomic force microscope (AFM). The defects preferred to have strong triangular shape features above certain bias voltage. To figure out the features of nitrogen dopant atom, we measured bias dependent STM images, scanning tunneling spectroscopy and AFM imaging. We have observed prominent difference in spectroscopic feature near the fermi energy between defects and pristine graphene. In addition, we also have observed atomic configuration of defect site using AFM. With the aid of STM simulation based on calculated results from the density functional theory, possible candidates of defect types will be provided.