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Article: Electromagnetic and Chemical Enhancements of Surface-Enhanced Raman Scattering Spectra from Cu2O Hexagonal Nanoplates

TitleElectromagnetic and Chemical Enhancements of Surface-Enhanced Raman Scattering Spectra from Cu2O Hexagonal Nanoplates
Authors
Keywordschemical enhancement
Cu2O nanoplates
electromagnetic enhancement
shape‐controlled synthesis
surface‐enhanced Raman scattering
Issue Date2019
PublisherWiley-VCH Verlag GmbH & Co. KGaA. The Journal's web site is located at http://www.ami-journal.com/
Citation
Advanced Materials Interfaces, 2019, v. 6 n. 17, p. article no. 1900534 How to Cite?
AbstractSurface-enhanced Raman scattering (SERS) has been extensively studied, but quantifiable results on electromagnetic enhancement (EM) are primarily focused on noble metals; as for metal oxides, limited studies exist, and a common impression regarding Raman scatterings is not able to elaborate mechanisms involving EM and multiplicative chemical enhancements. Leveraging on the shape-controlled synthesis of Cu2O, the hexagonal nanoplates exhibit a remarkable SERS activity and reproducible measurements, enabling a systematic investigation of the SERS mechanism of Cu2O. Here the shape-dependent SERS activity is elaborated by applying finite-difference time-domain simulation; the dominant contributions to SERS activity ascribed to chemical-bonding and charge-transfer (CT) enhancements are investigated using ab initio calculation. As the example, it is shown that the chemisorption of 4-aminothiophenol (PATP) on Cu2O nanoplates leads to the shift of highest occupied molecular orbital and lowest unoccupied molecular orbital levels, promoting efficient CT processes. The vibronic coupling of the conduction and valence bands of Cu2O with the molecular orbital of PATP further enhances the Raman scattering. This study on the combined EM and CT channels on Cu2O nanoplates is promising to identify a new group of SERS-active substrates and advance the fundamental understanding of SERS mechanism, which also opens up a prospect of biocompatible and in situ diagnosis.
Persistent Identifierhttp://hdl.handle.net/10722/274413
ISSN
2020 Impact Factor: 6.147
2020 SCImago Journal Rankings: 1.671
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLiu, C-
dc.contributor.authorSong, Q-
dc.contributor.authorChen, J-
dc.contributor.authorLi, X-
dc.contributor.authorCai, J-
dc.contributor.authorLu, Z-
dc.contributor.authorLi, W-
dc.contributor.authorFang, NX-
dc.contributor.authorFeng, SP-
dc.date.accessioned2019-08-18T15:01:14Z-
dc.date.available2019-08-18T15:01:14Z-
dc.date.issued2019-
dc.identifier.citationAdvanced Materials Interfaces, 2019, v. 6 n. 17, p. article no. 1900534-
dc.identifier.issn2196-7350-
dc.identifier.urihttp://hdl.handle.net/10722/274413-
dc.description.abstractSurface-enhanced Raman scattering (SERS) has been extensively studied, but quantifiable results on electromagnetic enhancement (EM) are primarily focused on noble metals; as for metal oxides, limited studies exist, and a common impression regarding Raman scatterings is not able to elaborate mechanisms involving EM and multiplicative chemical enhancements. Leveraging on the shape-controlled synthesis of Cu2O, the hexagonal nanoplates exhibit a remarkable SERS activity and reproducible measurements, enabling a systematic investigation of the SERS mechanism of Cu2O. Here the shape-dependent SERS activity is elaborated by applying finite-difference time-domain simulation; the dominant contributions to SERS activity ascribed to chemical-bonding and charge-transfer (CT) enhancements are investigated using ab initio calculation. As the example, it is shown that the chemisorption of 4-aminothiophenol (PATP) on Cu2O nanoplates leads to the shift of highest occupied molecular orbital and lowest unoccupied molecular orbital levels, promoting efficient CT processes. The vibronic coupling of the conduction and valence bands of Cu2O with the molecular orbital of PATP further enhances the Raman scattering. This study on the combined EM and CT channels on Cu2O nanoplates is promising to identify a new group of SERS-active substrates and advance the fundamental understanding of SERS mechanism, which also opens up a prospect of biocompatible and in situ diagnosis.-
dc.languageeng-
dc.publisherWiley-VCH Verlag GmbH & Co. KGaA. The Journal's web site is located at http://www.ami-journal.com/-
dc.relation.ispartofAdvanced Materials Interfaces-
dc.rightsThis is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.-
dc.subjectchemical enhancement-
dc.subjectCu2O nanoplates-
dc.subjectelectromagnetic enhancement-
dc.subjectshape‐controlled synthesis-
dc.subjectsurface‐enhanced Raman scattering-
dc.titleElectromagnetic and Chemical Enhancements of Surface-Enhanced Raman Scattering Spectra from Cu2O Hexagonal Nanoplates-
dc.typeArticle-
dc.identifier.emailCai, J: caijingx@hku.hk-
dc.identifier.emailLi, W: liwd@hku.hk-
dc.identifier.emailFeng, SP: hpfeng@hku.hk-
dc.identifier.authorityLi, W=rp01581-
dc.identifier.authorityFeng, SP=rp01533-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/admi.201900534-
dc.identifier.scopuseid_2-s2.0-85068522319-
dc.identifier.hkuros302091-
dc.identifier.volume6-
dc.identifier.issue17-
dc.identifier.spagearticle no. 1900534-
dc.identifier.epagearticle no. 1900534-
dc.identifier.isiWOS:000476214000001-
dc.publisher.placeGermany-
dc.identifier.issnl2196-7350-

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