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Study of Chemical Enhancement Mechanism in Non-plasmonic Surface Enhanced Raman Spectroscopy (SERS)

Title
Study of Chemical Enhancement Mechanism in Non-plasmonic Surface Enhanced Raman Spectroscopy (SERS)
Authors
Kim, JayeongJang, YujinKim, Nam-JungKim, HeehunYi, Gyu-ChulShin, YukyungKim, Myung HwaYoon, Seokhyun
Ewha Authors
윤석현
SCOPUS Author ID
윤석현scopus
Issue Date
2019
Journal Title
FRONTIERS IN CHEMISTRY
ISSN
2296-2646JCR Link
Citation
FRONTIERS IN CHEMISTRY vol. 7
Keywords
surface enhanced Raman scatteringchemical enhancementenhancement mechanismcharge transfersemiconductor microstructure
Publisher
FRONTIERS MEDIA SA
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
Surface enhanced Raman spectroscopy (SERS) has been intensively investigated during the past decades for its enormous electromagnetic field enhancement near the nanoscale metallic surfaces. Chemical enhancement of SERS, however, remains rather elusive despite intensive research efforts, mainly due to the relatively complex enhancing factors and inconsistent experimental results. To study details of chemical enhancement mechanism, we prepared various low dimensional semiconductor substrates such as ZnO and GaN that were fabricated via metal organic chemical vapor deposition process. We used three kinds of molecules (4-MPY, 4-MBA, 4-ATP) as analytes to measure SERS spectra under non-plasmonic conditions to understand charge transfer mechanisms between a substrate and analyte molecules leading to chemical enhancement. We observed that there is a preferential route for charge transfer responsible for chemical enhancement, that is, there exists a dominant enhancement process in non-plasmonic SERS. To further confirm our idea of charge transfer mechanism, we used a combination of 2-dimensional transition metal dichalcogenide substrates and analyte molecules. We also observed significant enhancement of Raman signal from molecules adsorbed on 2-dimensional transition metal dichalcogenide surface that is completely consistent with our previous results. We also discuss crucial factors for increasing enhancement factors for chemical enhancement without involving plasmonic resonance.
DOI
10.3389/fchem.2019.00582
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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