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Small. 2013 Oct 11;9(19):3247-51. doi: 10.1002/smll.201300050. Epub 2013 Apr 22.

Twisted bi-layer graphene: microscopic rainbows.

Author information

1
ICTEAM, Université catholique de Louvain, Louvain-la-Neuve, 1348, Belgium. jessica.campos@uclouvain.be.

Abstract

Blue, pink, and yellow colorations appear from twisted bi-layer graphene (tBLG) when transferred to a SiO2 /Si substrate (SiO2 = 100 nm-thick). Raman and electron microscope studies reveal that these colorations appear for twist angles in the 9-15° range. Optical contrast simulations confirm that the observed colorations are related to the angle-dependent electronic properties of tBLG combined with the reflection that results from the layered structure tBLG/100 nm-thick SiO2 /Si.

KEYWORDS:

HRTEM; Raman spectroscopy; graphene; optical contrasts; twisted bi-layer graphene

PMID:
23606323
DOI:
10.1002/smll.201300050
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