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|
| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
PHYS.P-83 |
| Subject |
Raman Spectroscopy Methods That Avoid Luminescence Background for Graphene on Copper Foil |
| Authors |
Jieun Choi, Sunmin Ryu*
Department of Chemistry, POSTECH(Pohang University of Science and Technology), Korea
|
| Abstract |
Raman spectroscopy has been a versatile tool to characterize various material properties of graphene such as structural defects, thickness, stacking, strain and charge density. However, it still remains a challenge to apply the optical method to graphene supported on luminescing substrates including copper, the most popular catalyst for chemical vapor deposition (CVD). In this work, we investigated as-grown graphene on Cu foil to develop optical methods that retrieve quality Raman signals in the presence of overwhelmingly strong luminescence background. In one approach, we varied excitation in the range of 1.58 ~ 2.71 eV to avoid spectral overlap between Raman and luminescence signals. Secondly, we introduced a polarization difference technique that utilizes arithmetic subtraction between two polarized Raman signals parallel and perpendicular to incident light. Depolarized luminescence signal can be greatly reduced with respect to Raman signals of polarized modes. Since the polarization difference method works best in a shot-noise-limited regime, we systematically characterized major types of noises such as shot noise, read-out noise and fixed-structure noise present in our Raman spectroscopy system using Rhodamine 6G dye solution. The proposed method will be an efficient and reliable optical tool to characterize material properties of as-grown CVD graphene without a transfer process. |
| E-mail |
cju5598@postech.ac.kr |
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121st General Meeting of the KCS