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Title: Novel method for the preparation of core-shell nanoparticles with movable Ag core and polystyrene loop shell

Abstract

Core/shell nanoparticles with movable silver (Ag) core and polystyrene (PSt) shell (Ag at PSt nanoparticle) were successfully synthesized at room temperature and under ambient pressure via two steps: {gamma}-irradiation and interfacial-initiated polymerization. Firstly, mono-dispersed Ag nanoparticles with diameters 20 nm were synthesized in inversed microemulsion by reducing silver nitrate under {gamma}-irradiation. Then, Ag nanoparticles were coated with PSt via interfacial-initiated polymerization with cumene hydroperoxide/ferrous sulfate/disodium ethylenediaminetetraacetate/sodium formaldehyde sulfoxylate (CHPO-Fe {sup 2+}-EDTA-SFS) as the redox initiation pair. The resulted Ag at PSt nanoparticles were identified by transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS)

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Department of Polymer Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China)
  2. Department of Polymer Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China). E-mail: lwj3600@ustc.edu
Publication Date:
OSTI Identifier:
20784982
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 4; Other Information: DOI: 10.1016/j.jssc.2006.01.042; PII: S0022-4596(06)00050-8; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; EDTA; GAMMA RADIATION; IRRADIATION; LIGHT SCATTERING; MICROEMULSIONS; NANOSTRUCTURES; PARTICLES; POLYMERIZATION; POLYSTYRENE; SILVER; SILVER NITRATES; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Liu Weijun, Zhang Zhicheng, He Weidong, Zheng Cheng, Ge Xuewu, Li, Jian, Liu Huarong, and Jiang Hao. Novel method for the preparation of core-shell nanoparticles with movable Ag core and polystyrene loop shell. United States: N. p., 2006. Web.
Liu Weijun, Zhang Zhicheng, He Weidong, Zheng Cheng, Ge Xuewu, Li, Jian, Liu Huarong, & Jiang Hao. Novel method for the preparation of core-shell nanoparticles with movable Ag core and polystyrene loop shell. United States.
Liu Weijun, Zhang Zhicheng, He Weidong, Zheng Cheng, Ge Xuewu, Li, Jian, Liu Huarong, and Jiang Hao. Sat . "Novel method for the preparation of core-shell nanoparticles with movable Ag core and polystyrene loop shell". United States. doi:.
@article{osti_20784982,
title = {Novel method for the preparation of core-shell nanoparticles with movable Ag core and polystyrene loop shell},
author = {Liu Weijun and Zhang Zhicheng and He Weidong and Zheng Cheng and Ge Xuewu and Li, Jian and Liu Huarong and Jiang Hao},
abstractNote = {Core/shell nanoparticles with movable silver (Ag) core and polystyrene (PSt) shell (Ag at PSt nanoparticle) were successfully synthesized at room temperature and under ambient pressure via two steps: {gamma}-irradiation and interfacial-initiated polymerization. Firstly, mono-dispersed Ag nanoparticles with diameters 20 nm were synthesized in inversed microemulsion by reducing silver nitrate under {gamma}-irradiation. Then, Ag nanoparticles were coated with PSt via interfacial-initiated polymerization with cumene hydroperoxide/ferrous sulfate/disodium ethylenediaminetetraacetate/sodium formaldehyde sulfoxylate (CHPO-Fe {sup 2+}-EDTA-SFS) as the redox initiation pair. The resulted Ag at PSt nanoparticles were identified by transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS)},
doi = {},
journal = {Journal of Solid State Chemistry},
number = 4,
volume = 179,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}
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  • Abstract not provided.
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  • We show that the spatial distribution of the electromagnetic (EM) field enhancement can be probed directly via dynamic evolution of surface-enhanced Raman scattering (SERS) of Rhodamine 6G (R6G) molecules as they diffuse into Ag@SiO2 core-shell nanoparticles. The porous silica shell limits the diffusion of R6G molecules towards inner Ag cores, thereby allowing direct observation and quantification of the spatial distribution of SERS enhancement as molecules migrate from the low to high EM fields inside the dielectric silica shell. Our experimental evidence is validated by the generalized Mie theory, and the approach can potentially offer a novel platform for further investigatingmore » the site and spatial distribution of the EM fields and the EM versus chemical enhancement of SERS due to molecular confinement within the Ag@SiO2 nanoshell.« less
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