Signature vibrational bands for defects in CVD single-layer graphene by surface-enhanced Raman spectroscopy

Dallas L. Matz, Hossein Sojoudi, Samuel Graham, Jeanne E Pemberton

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We report the observation of signature vibrational bands in the frequency region between 900 and 1600 cm-1 for defects in single-layer graphene (SLG) using surface Raman spectroscopy in ultrahigh vacuum. Vapor deposition of Ag leads to the formation of surface nanoparticles that migrate to defects in the SLG, leading to surface-enhanced Raman scattering (SERS) of the graphene G and 2D bands as well as new vibrational modes ascribed to native defects. Many of the new spectral bands of these native defects are similar, although not identical, to those predicted previously for -C2 defects. These new bands are observed in addition to bands more commonly observed for defective graphene that are attributed to the D, G∗, D+G, and 2D' modes. The defects observed in these SLG films are not believed to result from the Ag deposition process but are postulated to be formed during the graphene CVD growth process. These defects are then made visible by postdeposition of Ag due to SERS.

Original languageEnglish (US)
Pages (from-to)964-969
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume6
Issue number6
DOIs
StatePublished - Mar 19 2015

Fingerprint

Graphite
Graphene
Raman spectroscopy
Chemical vapor deposition
graphene
signatures
vapor deposition
Defects
defects
Raman scattering
Raman spectra
Vapor deposition
Ultrahigh vacuum
spectral bands
ultrahigh vacuum
vibration mode
Nanoparticles
nanoparticles

Keywords

  • defects
  • single-layer graphene
  • surface-enhanced Raman scattering

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Signature vibrational bands for defects in CVD single-layer graphene by surface-enhanced Raman spectroscopy. / Matz, Dallas L.; Sojoudi, Hossein; Graham, Samuel; Pemberton, Jeanne E.

In: Journal of Physical Chemistry Letters, Vol. 6, No. 6, 19.03.2015, p. 964-969.

Research output: Contribution to journalArticle

@article{aa6b5aafe6bd4c5981a432d96454d18f,
title = "Signature vibrational bands for defects in CVD single-layer graphene by surface-enhanced Raman spectroscopy",
abstract = "We report the observation of signature vibrational bands in the frequency region between 900 and 1600 cm-1 for defects in single-layer graphene (SLG) using surface Raman spectroscopy in ultrahigh vacuum. Vapor deposition of Ag leads to the formation of surface nanoparticles that migrate to defects in the SLG, leading to surface-enhanced Raman scattering (SERS) of the graphene G and 2D bands as well as new vibrational modes ascribed to native defects. Many of the new spectral bands of these native defects are similar, although not identical, to those predicted previously for -C2 defects. These new bands are observed in addition to bands more commonly observed for defective graphene that are attributed to the D, G∗, D+G, and 2D' modes. The defects observed in these SLG films are not believed to result from the Ag deposition process but are postulated to be formed during the graphene CVD growth process. These defects are then made visible by postdeposition of Ag due to SERS.",
keywords = "defects, single-layer graphene, surface-enhanced Raman scattering",
author = "Matz, {Dallas L.} and Hossein Sojoudi and Samuel Graham and Pemberton, {Jeanne E}",
year = "2015",
month = "3",
day = "19",
doi = "10.1021/jz5027272",
language = "English (US)",
volume = "6",
pages = "964--969",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
number = "6",

}

TY - JOUR

T1 - Signature vibrational bands for defects in CVD single-layer graphene by surface-enhanced Raman spectroscopy

AU - Matz, Dallas L.

AU - Sojoudi, Hossein

AU - Graham, Samuel

AU - Pemberton, Jeanne E

PY - 2015/3/19

Y1 - 2015/3/19

N2 - We report the observation of signature vibrational bands in the frequency region between 900 and 1600 cm-1 for defects in single-layer graphene (SLG) using surface Raman spectroscopy in ultrahigh vacuum. Vapor deposition of Ag leads to the formation of surface nanoparticles that migrate to defects in the SLG, leading to surface-enhanced Raman scattering (SERS) of the graphene G and 2D bands as well as new vibrational modes ascribed to native defects. Many of the new spectral bands of these native defects are similar, although not identical, to those predicted previously for -C2 defects. These new bands are observed in addition to bands more commonly observed for defective graphene that are attributed to the D, G∗, D+G, and 2D' modes. The defects observed in these SLG films are not believed to result from the Ag deposition process but are postulated to be formed during the graphene CVD growth process. These defects are then made visible by postdeposition of Ag due to SERS.

AB - We report the observation of signature vibrational bands in the frequency region between 900 and 1600 cm-1 for defects in single-layer graphene (SLG) using surface Raman spectroscopy in ultrahigh vacuum. Vapor deposition of Ag leads to the formation of surface nanoparticles that migrate to defects in the SLG, leading to surface-enhanced Raman scattering (SERS) of the graphene G and 2D bands as well as new vibrational modes ascribed to native defects. Many of the new spectral bands of these native defects are similar, although not identical, to those predicted previously for -C2 defects. These new bands are observed in addition to bands more commonly observed for defective graphene that are attributed to the D, G∗, D+G, and 2D' modes. The defects observed in these SLG films are not believed to result from the Ag deposition process but are postulated to be formed during the graphene CVD growth process. These defects are then made visible by postdeposition of Ag due to SERS.

KW - defects

KW - single-layer graphene

KW - surface-enhanced Raman scattering

UR - http://www.scopus.com/inward/record.url?scp=84925268515&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84925268515&partnerID=8YFLogxK

U2 - 10.1021/jz5027272

DO - 10.1021/jz5027272

M3 - Article

AN - SCOPUS:84925268515

VL - 6

SP - 964

EP - 969

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 6

ER -