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Title: Graphene-enhanced intermolecular interaction at interface between copper- and cobalt-phthalocyanines

Abstract

Interfacial electronic structures of copper-phthalocyanine (CuPc), cobalt-phthalocyanine (CoPc), and graphene were investigated experimentally by using photoelectron spectroscopy. While the CuPc/graphene interface shows flat band structure and negligible interfacial dipole indicating quite weak molecule-substrate interaction, the CuPc/CoPc/graphene interface shows a large interfacial dipole and obvious energy level bending. Controlled experiments ruled out possible influences from the change in film structure of CuPc and pure π–π interaction between CoPc and CuPc. Analysis based on X-ray photoelectron spectroscopy and density functional theory reveals that the decrease in the work function for the CuPc/CoPc/graphene system is induced by the intermolecular interaction between CuPc and CoPc which is enhanced owning to the peculiar electronic properties at the CoPc-graphene interface.

Authors:
 [1];  [2];  [3]
  1. Department of Physics, Shaoxing University, Shaoxing 312000 (China)
  2. Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069 (United States)
  3. Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Material Science, City University of Hong Kong, Hong Kong (China)
Publication Date:
OSTI Identifier:
22489685
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 143; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COBALT COMPLEXES; COPPER; COPPER COMPLEXES; DENSITY FUNCTIONAL METHOD; DIPOLES; ELECTRONIC STRUCTURE; ENERGY LEVELS; FILMS; GRAPHENE; INTERACTIONS; INTERFACES; MOLECULES; PHTHALOCYANINES; SUBSTRATES; WORK FUNCTIONS; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Dou, Wei-Dong, Center of Super-Diamond and Advanced Films, Huang, Shu-Ping, and Lee, Chun-Sing. Graphene-enhanced intermolecular interaction at interface between copper- and cobalt-phthalocyanines. United States: N. p., 2015. Web. doi:10.1063/1.4932192.
Dou, Wei-Dong, Center of Super-Diamond and Advanced Films, Huang, Shu-Ping, & Lee, Chun-Sing. Graphene-enhanced intermolecular interaction at interface between copper- and cobalt-phthalocyanines. United States. doi:10.1063/1.4932192.
Dou, Wei-Dong, Center of Super-Diamond and Advanced Films, Huang, Shu-Ping, and Lee, Chun-Sing. Wed . "Graphene-enhanced intermolecular interaction at interface between copper- and cobalt-phthalocyanines". United States. doi:10.1063/1.4932192.
@article{osti_22489685,
title = {Graphene-enhanced intermolecular interaction at interface between copper- and cobalt-phthalocyanines},
author = {Dou, Wei-Dong and Center of Super-Diamond and Advanced Films and Huang, Shu-Ping and Lee, Chun-Sing},
abstractNote = {Interfacial electronic structures of copper-phthalocyanine (CuPc), cobalt-phthalocyanine (CoPc), and graphene were investigated experimentally by using photoelectron spectroscopy. While the CuPc/graphene interface shows flat band structure and negligible interfacial dipole indicating quite weak molecule-substrate interaction, the CuPc/CoPc/graphene interface shows a large interfacial dipole and obvious energy level bending. Controlled experiments ruled out possible influences from the change in film structure of CuPc and pure π–π interaction between CoPc and CuPc. Analysis based on X-ray photoelectron spectroscopy and density functional theory reveals that the decrease in the work function for the CuPc/CoPc/graphene system is induced by the intermolecular interaction between CuPc and CoPc which is enhanced owning to the peculiar electronic properties at the CoPc-graphene interface.},
doi = {10.1063/1.4932192},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 13,
volume = 143,
place = {United States},
year = {2015},
month = {10}
}