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Titre du document / Document title

Raman Spectroscopy of Ripple Formation in Suspended Graphene

Auteur(s) / Author(s)

CHEN Chun-Chung (1) ; WENZHONG BAO (2) ; THEISS Jesse (1) ; DAMES Chris (3) ; CHUN NING LAU (2) ; CRONIN Stephen B. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, ETATS-UNIS
(2) Department of Physics and Astronomy, University of California, Riverside, California 92521, ETATS-UNIS
(3) Department of Mechanical Engineering, University of California, Riverside, California 92521, ETATS-UNIS

Résumé / Abstract

Using Raman spectroscopy, we measure the optical phonon energies of suspended graphene before, during, and after thermal cycling betweer 300 and 700 K. After cycling, we observe large upshifts (∼25 cm―1) of the G band frequency in the graphene on the substrate region due tc compression induced by the thermal contraction of the underlying substrate, while the G band in the suspended region remains unchanged From these large upshifts, we estimate the compression in the substrate region to be ∼0.4%. The large mismatch in compression betweer the substrate and suspended regions causes a rippling of the suspended graphene, which compensates for the change in lattice constant due to the compression. The amplitude (A) and wavelength (λ) of the ripples, as measured by atomic force microscopy, correspond to an effective change in length ΔI/I that is consistent with the compression values determined from the Raman data.

Revue / Journal Title

Nano letters    ISSN  1530-6984 

Source / Source

2009, vol. 9, no12, pp. 4172-4176 [5 page(s) (article)] (32 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Chemical Society, Washington, DC, ETATS-UNIS  (2001) (Revue)

Mots-clés anglais / English Keywords

Graphene

;

Atomic force microscopy

;

Crystal structure

;

Lattice parameters

;

Thermal cycling

;

Optical properties

;

Optical phonons

;

Raman spectroscopy

;

Mots-clés français / French Keywords

6146

;

7867

;

8105U

;

Substrat graphène

;

Graphène

;

Microscopie force atomique

;

Structure cristalline

;

Paramètre cristallin

;

Cyclage thermique

;

Propriété optique

;

Phonon optique

;

Spectrométrie Raman

;

Mots-clés espagnols / Spanish Keywords

Graphene

;

Localisation / Location

INIST-CNRS, Cote INIST : 27369, 35400017169716.0370

Nº notice refdoc (ud4) : 22207410



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