Issue 16, 2011
From the journal:

Physical Chemistry Chemical Physics

Magnetic field induced aggregation of nanoparticles for sensitive molecular detection†

Bong-Hyun Jun,‡a   Gunsung Kim,b   Jongho Baek,b   Homan Kang,c   Taeho Kim,a   Taeghwan Hyeon,a   Dae Hong Jeong*bc  and  Yoon-Sik Lee*ac  

* Corresponding authors

a School of Chemical and Biological Engineering, Seoul National University, Seoul, Korea
E-mail: yslee@snu.ac.kr
Fax: +82 2-876-9625
Tel: +82 2-880-7073

b Department of Chemistry Education, Seoul National University, Seoul, Korea

c Nano Systems Institute and Interdisciplinary Program in Nano-Science and Technology, Seoul National University, Seoul, Korea

Abstract

A molecular detection method utilizing the magnetically induced aggregation of silver nanoparticle (NP)-embedded silica NPs for SERS activation is described. Here, silver embedded magnetic NPs (Ag-M-dots) composed of a magnetic core and silica shells, on whose surface silver NPs were formed, were used. Because the magnetic field induced aggregated Ag-M-dots exhibit a strong SERS signal compared to the dispersed Ag-M-dots, the system allows for the detection of adsorbed Raman label compound even at the 100 fM level. Adenine was tested as a model biocompound and its Raman spectrum could be observed at concentrations as low as 1 pM. The experimental results were supported by the theoretical calculations.

Graphical abstract: Magnetic field induced aggregation of nanoparticles for sensitive molecular detection

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Article information

DOI
https://doi.org/10.1039/C0CP02055A
Article type
Paper
Submitted
06 Oct 2010
Accepted
21 Dec 2010
First published
14 Jan 2011

Phys. Chem. Chem. Phys., 2011,13, 7298-7303

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Magnetic field induced aggregation of nanoparticles for sensitive molecular detection

B. Jun, G. Kim, J. Baek, H. Kang, T. Kim, T. Hyeon, D. H. Jeong and Y. Lee, Phys. Chem. Chem. Phys., 2011, 13, 7298 DOI: 10.1039/C0CP02055A

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