BROWSE

Related Scientist

Researcher

나노 구조 물리 연구단
나노구조물리 연구단
more info

Monitoring defects on monolayer graphene using nematic liquid crystals

Cited 4 time in webofscience Cited 0 time in scopus
732 Viewed 224 Downloaded
Title
Monitoring defects on monolayer graphene using nematic liquid crystals
Author(s)
Lim, YJ; Lee, BH; Kwon, YR; Choi, YE; Murali, G; Lee, JH; Van Luan Nguyen; Young Hee Lee; Lee, SH
Publication Date
2015-06
Journal
OPTICS EXPRESS, v.23, no.11, pp.14162 - 14167
Publisher
OPTICAL SOC AMER
Abstract
Defects in graphene governs electrical and optical properties. Although grain boundaries in graphene inevitably formed during large area synthesis process, which act as scattering centers for charge carriers to degrade mobility, have been studied extensively, point defects have been rarely investigated mainly due to the absence of facile observation tools. Here, we report polarized optical microscopy to observe defect distributions in monolayer graphene. This was realized by aligning liquid crystal s (LC) on graphene where the defect population was modulated by irradiating ultraviolet (UV) light directly on graphene surface under moisture condition. Aromatic rings in LC molecules are oriented with hexagonal rings in graphene to have preferred orientation, providing a way to identify relative orientations of graphene domains and point defects. Our studies show that point defects generated by prolonged UV irradiation time give rise to irregular LC alignment with disclination lines on the graphene surface and a large-size LC domain associated with graphene single domain eventually disappeared. This indicates that defects associated with oxygen-containing functional groups cause to reduce the strong stacking interaction between graphene and LC molecules. (C) 2015 Optical Society of Americ
URI
https://pr.ibs.re.kr/handle/8788114/1745
ISSN
1094-4087
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
Monitoring defects on monolayer graphene using nematic liquid crystals.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse