Paper Title:
Preparation, Characterization, and Surface-Enhanced Raman Spectroscopy Activity of Spherical α-Fe2O3/Ag Core/Shell Nanoparticles
  Abstract

Spherical α-Fe2O3/Ag core/shell nanoparticles were prepared by reducing Ag(NH3)2+ with formaldehyde using the seeding method. 3- Aminopropyltriethoxysilane (APS) acts as a “bridge” to link between α-Fe2O3 core and Ag shell. The obtained nanoparticles were characterized by XRD, TEM, SEM, EDS, and Roman. The results show thatα-Fe2O3 cores are coated by Ag shell completely. The average size of α-Fe2O3/Ag nanoparticles is 95 nm and the thicknesses of Ag shell are 15nm in 3.7% HCHO and 1.0M AgNO3. The thickness of Ag shell can be tunable by changing reaction conditions, such as the concentration of AgNO3, reduction reaction rate. The surface-enhanced Raman scattering (SERS) effect of the core/shell particles are measured with Pyridine (Py) as molecule probe. SERS indicate that the Raman signals of Py adsorbed on α-Fe2O3/Ag nanoparticles exhibit large enhancement at 1010 and 1038 cm-1 respectively. And the intensity of signals is enhanced with the increase of the thickness of Ag shell. The uniform and rough surface of α-Fe2O3/Ag particles exhibits strong SERS activity in 3.7% HCHO and 1.0M AgNO3. The spherical α-Fe2O3/Ag core/shell nanoparticles exhibit SERS activity.

  Info
Periodical
Advanced Materials Research (Volumes 152-153)
Edited by
Zhengyi Jiang, Jingtao Han and Xianghua Liu
Pages
67-72
DOI
10.4028/www.scientific.net/AMR.152-153.67
Citation
C. R. Wang, Z. F. Zhou, Y. J. Li, R. R. Tian, X. C. Dai, "Preparation, Characterization, and Surface-Enhanced Raman Spectroscopy Activity of Spherical α-Fe2O3/Ag Core/Shell Nanoparticles", Advanced Materials Research, Vols. 152-153, pp. 67-72, 2011
Online since
October 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Chien Jung Huang, Pin Hsiang Chiu, Yeong Her Wang
Abstract:This paper describes a sol-gel (SG) method for the coating of gold nanoparticles with uniform shells of amorphous silica. The thickness of...
797
Authors: Xiao Ju Yao, Zhi Qiang Wei, Hua Yang, Li Gang Liu
Chapter 5: Optical/Electronic/Magnetic Materials
Abstract:In the protecting inert gas, Fe nanoparticles were successfully prepared by confined arc plasma method. The particle size, microstructure and...
1206
Authors: Jun Tang, Huan Fei Wen, Peng Lan Chai, Jun Liu, Yun Bo Shi, Chen Yang Xue
Abstract:In this work, an interesting phenomenon demonstrating the similarities between the results from both Surface Enhanced Raman Spectroscopy...
33