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Title: Optical Imaging and Spectroscopic Characterization of Self-Assembled Environmental Adsorbates on Graphene

Topographic studies using scanning probes have found that graphene surfaces are often covered by micron-scale domains of periodic stripes with a 4 nm pitch. These stripes have been variously interpreted as structural ripples or as self-assembled adsorbates. We show that the stripe domains are optically anisotropic by imaging them using a polarization-contrast technique. Optical spectra between 1.1 and 2.8 eV reveal that the anisotropy in the in-plane dielectric function is predominantly real, reaching 0.6 for an assumed layer thickness of 0.3 nm. Furthermore, the spectra are incompatible with a rippled graphene sheet but would be quantitatively explained by the self-assembly of chainlike organic molecules into nanoscale stripes.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [3] ; ORCiD logo [2] ;  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. National Institute for Materials Science, Tsukuba (Japan)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 18; Journal Issue: 4; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 54 ENVIRONMENTAL SCIENCES; adsorbates; friction; Graphene; polarized light; self-assembly
OSTI Identifier:
1457109

Gallagher, Patrick, Li, Yilei, Watanabe, Kenji, Taniguchi, Takashi, Heinz, Tony F., and Goldhaber-Gordon, David. Optical Imaging and Spectroscopic Characterization of Self-Assembled Environmental Adsorbates on Graphene. United States: N. p., Web. doi:10.1021/acs.nanolett.8b00348.
Gallagher, Patrick, Li, Yilei, Watanabe, Kenji, Taniguchi, Takashi, Heinz, Tony F., & Goldhaber-Gordon, David. Optical Imaging and Spectroscopic Characterization of Self-Assembled Environmental Adsorbates on Graphene. United States. doi:10.1021/acs.nanolett.8b00348.
Gallagher, Patrick, Li, Yilei, Watanabe, Kenji, Taniguchi, Takashi, Heinz, Tony F., and Goldhaber-Gordon, David. 2018. "Optical Imaging and Spectroscopic Characterization of Self-Assembled Environmental Adsorbates on Graphene". United States. doi:10.1021/acs.nanolett.8b00348. https://www.osti.gov/servlets/purl/1457109.
@article{osti_1457109,
title = {Optical Imaging and Spectroscopic Characterization of Self-Assembled Environmental Adsorbates on Graphene},
author = {Gallagher, Patrick and Li, Yilei and Watanabe, Kenji and Taniguchi, Takashi and Heinz, Tony F. and Goldhaber-Gordon, David},
abstractNote = {Topographic studies using scanning probes have found that graphene surfaces are often covered by micron-scale domains of periodic stripes with a 4 nm pitch. These stripes have been variously interpreted as structural ripples or as self-assembled adsorbates. We show that the stripe domains are optically anisotropic by imaging them using a polarization-contrast technique. Optical spectra between 1.1 and 2.8 eV reveal that the anisotropy in the in-plane dielectric function is predominantly real, reaching 0.6 for an assumed layer thickness of 0.3 nm. Furthermore, the spectra are incompatible with a rippled graphene sheet but would be quantitatively explained by the self-assembly of chainlike organic molecules into nanoscale stripes.},
doi = {10.1021/acs.nanolett.8b00348},
journal = {Nano Letters},
number = 4,
volume = 18,
place = {United States},
year = {2018},
month = {3}
}