Table of Contents
International Journal of Inorganic Chemistry
Volume 2012 (2012), Article ID 439751, 7 pages
Research Article

Synthesis and Characterization of Functionalized Magnetic Nanoparticles for the Detection of Pesticide

1School of Material Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi City, Ishikawa 923-1292, Japan
2Department of Physics, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku,Yokohama 240-8501, Japan
3Department of Food Science, Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, 1-308 Suematsu, Nonoichi, Ishikawa 921-8836, Japan

Received 13 February 2012; Accepted 9 April 2012

Academic Editor: Liane M. Rossi

Copyright © 2012 Shu Taira et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We synthesized magnetic nanoparticles (MNPs) by mixing aqueous solutions of 3d transition metal chlorides ( ) and a sodium metasilicate nonahydrate ( ) in order to produce monodispersed MNPs in a single step. The particle size can be controlled by adjusting the annealing temperature. We characterized the MNPs by X-ray diffraction (XRD), superconducting quantum interference device (SQUID), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), and zeta-potential measurement. Paramagnetic and superparamagnetic behaviors were found for the obtained samples depending on the particle size (  nm). The synthesized MNPs could be modified with the amino-, phenyl-, and carboxy- groups on MNPs' surface by silanization procedure, respectively. The purpose of functionalizing the surface of the nanoscale magnetic particles was to realize subsequent capture and detection with desired other molecules by nanoparticle assisted laser ionization/desorption mass spectrometry.