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Twisted Bi‐Layer Graphene: Microscopic Rainbows
Author(s) -
CamposDelgado J.,
AlgaraSiller G.,
Santos C. N.,
Kaiser U.,
Raskin J.P.
Publication year - 2013
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201300050
Subject(s) - graphene , reflection (computer programming) , layer (electronics) , materials science , raman spectroscopy , substrate (aquarium) , optics , crystallography , nanotechnology , computer science , physics , chemistry , geology , oceanography , programming language
Blue, pink, and yellow colorations appear from twisted bi‐layer graphene (tBLG) when transferred to a SiO 2 /Si substrate (SiO 2 = 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 SiO 2 /Si.