Anomalous K-Point Phonons in Noble Metal/Graphene Heterostructure Activated by Localized Surface Plasmon Resonance

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Title
Anomalous K-Point Phonons in Noble Metal/Graphene Heterostructure Activated by Localized Surface Plasmon Resonance
Author(s)
Un Jeong Kim; Jun Suk Kim; Noejung Park; Sanghyub Lee; Ukjae Lee; Yeonsang Park; Jinbong Seok; Sungwoo Hwang; Hyunbin Son; Young Hee Lee
Publication Date
2018-12
Journal
ACS NANO, v.12, no.12, pp.12733 - 12740
Publisher
AMER CHEMICAL SOC
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 similar to 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 similar to 1350 cm(-1) over G-band (similar to 1590 cm(-1)) exhibits nonlinear but resonant behavior with the excitation laser wavelength, and more importantly, the phonon frequency-laser energy dispersion is similar to 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 not equal 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 © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5362
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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