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Theoretical modeling of tip-enhanced resonance Raman images of switchable azobenzene molecules on Au(111)
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology. Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Key Lab Med Phys & Image Proc Techo, Jinan 250014, Shandong, Peoples R China.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.ORCID iD: 0000-0002-3282-0711
Yanshan Univ, Coll Sci, Qinhuangdao 066004, Peoples R China..
Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Key Lab Med Phys & Image Proc Techo, Jinan 250014, Shandong, Peoples R China..
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2018 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 10, no 25, p. 11850-11860Article in journal (Refereed) Published
Abstract [en]

With a highly localized plasmonic field, tip-enhanced Raman spectroscopy (TERS) images have reached atomic-scale resolution, providing an optical means to explore the structure of a single molecule. We have applied the recently developed theoretical method to simulate the TERS images of trans and cis azobenzene as well as its derivatives on Au(111). Our theoretical results reveal that when the first excited state is resonantly excited, TERS images from a highly confined plasmonic field can effectively distinguish the isomer configurations of the adsorbates. The decay of the plasmonic field along the surface normal can be further used to distinguish different nonplanar cis configurations. Moreover, subtle characteristics of different molecular configurations can also be identified from the TERS images of other resonant excited states with a super-high confined plasmonic field. These findings serve as good references for future TERS experiments on molecular isomers.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2018. Vol. 10, no 25, p. 11850-11860
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-232390DOI: 10.1039/c8nr01988fISI: 000437761500015PubMedID: 29897090Scopus ID: 2-s2.0-85049505191OAI: oai:DiVA.org:kth-232390DiVA, id: diva2:1235784
Funder
Swedish Research Council
Note

QC 20180727

Available from: 2018-07-27 Created: 2018-07-27 Last updated: 2018-07-27Bibliographically approved

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