Large-area few-layered graphene film determination by multispectral imaging microscopy.
A multispectral imaging method for the rapid and accurate identification of few-layered graphene using optical images is proposed. Commonly rapid identification relies on optical interference effects which limits the choice of substrates and light sources. Our method is based on the comparison of spectral characteristics with principle components from a database which is populated by correlation of micro-Raman registration, spectral characteristics, and optical microscopy. Using this approach the thickness and extent of different graphene layers can be distinguished without the contribution of the optical interference effects and allows characterization of graphene on glass substrates. The high achievable resolution, easy implementation and large scale make this approach suitable for the in-line metrology of industrial graphene production.
Graduate Institute of Opto-Mechatronics, National Chung Cheng University, 168, University Rd., Min-Hsiung, Chia-Yi 62102, Taiwan. hcwang@ccu.edu.tw.
Hsiang-Chen
HC
Wang
Shih-Wei
SW
Huang
Jhe-Ming
JM
Yang
Guan-Huang
GH
Wu
Ya-Ping
YP
Hsieh
Shih-Wei
SW
Feng
Min Kai
MK
Lee
Chie-Tong
CT
Kuo