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Park, Noejung
Computational Physics & Electronic Structure Lab.
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dc.citation.endPage 12741 -
dc.citation.number 12 -
dc.citation.startPage 12733 -
dc.citation.title ACS NANO -
dc.citation.volume 12 -
dc.contributor.author Kim, Un Jeong -
dc.contributor.author Kim, Jun Suk -
dc.contributor.author Park, Noejung -
dc.contributor.author Lee, Sanghyub -
dc.contributor.author Park, Yeonsang -
dc.contributor.author Seok, Jinbong -
dc.contributor.author Hwang, Sungwoo -
dc.contributor.author Son, Hyungbin -
dc.contributor.author Lee, Young Hee -
dc.date.accessioned 2023-12-21T19:47:19Z -
dc.date.available 2023-12-21T19:47:19Z -
dc.date.created 2019-01-08 -
dc.date.issued 2018-12 -
dc.description.abstract The metal/graphene interface has been one of the most important research topics with regard to charge screening, charge transfer, contact resistance, and solar cells. Chemical bond formation of metal and graphene can be deduced from the defect induced D-band and its second-order mode, 2D band, measured by Raman spectroscopy, as a simple and nondestructive method. However, a phonon mode located at ∼1350 cm-1, which is normally known as the defect-induced D-band, is intriguing for graphene deposited with noble metals (Ag, Au, and Cu). We observe anomalous K-point phonons in nonreactive noble metal/graphene heterostructures. The intensity ratio of the midfrequency mode at ∼1350 cm-1 over G-band (∼1590 cm-1) exhibits nonlinear but resonant behavior with the excitation laser wavelength, and more importantly, the phonon frequency-laser energy dispersion is ∼10-17 cm-1 eV-1, which is much less than the conventional range. These phonon modes of graphene at nonzero phonon wave vector (q ≠ 0) around K points are activated by localized surface plasmon resonance and not by the defects due to chemical bond formation of metal/graphene. This hypothesis is supported by density functional theory (DFT) calculations for noble metals and Cr along with the measured contact resistances. -
dc.identifier.bibliographicCitation ACS NANO, v.12, no.12, pp.12733 - 12741 -
dc.identifier.doi 10.1021/acsnano.8b07761 -
dc.identifier.issn 1936-0851 -
dc.identifier.scopusid 2-s2.0-85058628840 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/25611 -
dc.identifier.url https://pubs.acs.org/doi/10.1021/acsnano.8b07761 -
dc.identifier.wosid 000454567500097 -
dc.language 영어 -
dc.publisher AMER CHEMICAL SOC -
dc.title Anomalous K-Point Phonons in Noble Metal/Graphene Heterostructure Activated by Localized Surface Plasmon Resonance -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary -
dc.relation.journalResearchArea Chemistry; Science & Technology - Other Topics; Materials Science -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor graphene -
dc.subject.keywordAuthor noble metal -
dc.subject.keywordAuthor Raman -
dc.subject.keywordAuthor K-point phonon -
dc.subject.keywordAuthor localized surface plasmon -
dc.subject.keywordPlus LIMITS -
dc.subject.keywordPlus GOLD -
dc.subject.keywordPlus TOTAL-ENERGY CALCULATIONS -
dc.subject.keywordPlus METAL-GRAPHENE -
dc.subject.keywordPlus CONTACT RESISTANCE -
dc.subject.keywordPlus RAMAN-SCATTERING -
dc.subject.keywordPlus CARBON NANOTUBES -
dc.subject.keywordPlus WORK FUNCTION -
dc.subject.keywordPlus DEVICES -

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