Single‐Molecule Surface‐Enhanced Raman Scattering as a Probe for Adsorption Dynamics on Metal Surfaces

Takase, Mai; Nagasawa, Fumika; Nabika, Hideki; Murakoshi, Kei

doi:10.1002/9781118703601.ch5

Cited by 1 publication

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References 58 publications

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“…Surface-enhanced Raman scattering (SERS) is a promising tool for detecting the interactions between molecules and localized plasmons, especially for monitoring the plasmon-induced photoexcitation process. [11][12][13][14] Based on detailed SERS measurements of an isolated single-walled carbon nanotube (SWNT) by introducing a metal nanodimer with controlled nanogap, SWNTs with certain chirality have been observed via the resonant excitation of normally forbidden transitions. 15 The newly developed extended discrete dipole approximation method showed that the highly confined electromagnetic field at the nanogap (less than 2 nm) generates an intensity gradient of the field, resulting in the excitation of higher order polarization in the direction of the radial breathing mode in the SWNT.…”

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confidence: 99%

Molecule Manipulation at Electrified Interfaces using Metal Nanogates

et al. 2014

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Previously documented results on molecule manipulation using metal nanogates are comprehensively reviewed to conclude novel characteristics, which could be widely used for the developments of the systems at electrified interfaces. Novel systems to segregate molecules from self-spreading lipid bilayers in electrolyte solutions have been developed by using metal nanogate structures on solid surfaces. The spatial distribution of target molecules in the lipid bilayer changes depending on the molecule characteristics, such as charge, size, and flexibility. Energy dissipation during the spreading of the molecules on the surface contributes to the compression of the lipid bilayer at the nanogate, leading to the formation of a gradient of the electrochemical potential of the bilayer system including the target molecule in the vicinity of the nanogate (<100 nm from the gate). The gradient results in a segregation force being applied to target molecules in the order of 10 −15 N per molecule. The segregation property can be tuned by changing the electrolytes, lipid molecules, temperature, and the width and surface hydrophobicity of the metal nanogate. Introduction of asymmetry to the nanogate leads to further effective diffusion control in a direction perpendicular to the spreading. It has been demonstrated that target molecules with a different number of glycolipid per protein in the lipid bilayer are effectively separated based on the Brownian ratchet mechanism.

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