title: Electrically Modulated Localized Surface Plasmon around Self-Assembled-Monolayer-Covered Nanoparticles.
abstract: This article reports the observation of electrical modulation of localized surface plasmon around self-assembled monolayer (SAM)-modified gold nanoparticles and the establishment of a new spectroscopy technique, that is, dynamic electro-optical spectroscopy (DEOS). The gold nanoparticles are deposited onto a transparent conductive substrate, and an electrical bias applied on the conductive substrate can cause shift of resonance plasmon response, where the direction of peak shift is related to the polarity of applied bias. The peak shift observed at 2.4 V is approximately ten times larger than those reported in previous work. It is postulated that significant peak shift is the result of reorientation of adsorbed water on electrode, which can change local dielectric environment of nanoparticles. An energy barrier is identified when adsorbed water molecules are turned from oxygen-down to oxygen-up. Frequency-dependent peak shifts on surface-modified gold nanoparticles show that reorientation is a fast reversible process with rich dynamics.
authors.affiliation: School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325001, China.|Wenzhou Institute of Biomaterials and Engineering, CNITECH, CAS , Wenzhou, Zhejiang 325001 China.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Ma
authors.affiliation: Department of Chemical Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Shandong
authors.initials: S
authors.lastname: Xu
authors.affiliation: Department of Chemistry, University of Central Florida , Orlando, Florida 32826, United States.|Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University , Chengdu, Sichuan 610030, China.
authors.forename: Chaoming
authors.initials: C
authors.lastname: Wang
authors.affiliation: Department of Chemistry, University of Central Florida , Orlando, Florida 32826, United States.
authors.forename: Haining
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Chemistry, University of Central Florida , Orlando, Florida 32826, United States.
authors.forename: Shengli
authors.initials: S
authors.lastname: Zou
authors.affiliation: School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325001, China.|Wenzhou Institute of Biomaterials and Engineering, CNITECH, CAS , Wenzhou, Zhejiang 325001 China.|Department of Chemical Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Ming
authors.identifier: 0000-0003-2060-7873
authors.initials: M
authors.lastname: Su