Characterization of polyaniline-coated magnetic nanoparticles for application in a disposable membrane strip biosensor

Issue		Eur. Phys. J. Appl. Phys. Volume 50, Number 1, April 2010


Article Number		11401
Number of page(s)		5
Section		Biophysics and Biosensors
DOI		10.1051/epjap/2010023
Published online		15 March 2010

Eur. Phys. J. Appl. Phys. 50, 11401 (2010)

Characterization of polyaniline-coated magnetic nanoparticles for application in a disposable membrane strip biosensor

J. S. Yuk¹, J. Rose² and E. C. Alocilja¹

¹ Department of Biosystems and Agricultural Engineering, East Lansing, MI, 48824, USA
² Department of Crop and Soil Science, Michigan State University, East Lansing, MI, 48824, USA

Corresponding author: alocilja@msu.edu

Received: 4 February 2009
Revised: 14 December 2009
Accepted: 5 January 2010

Abstract

We investigated the electrical properties of polyaniline-coated magnetic nanoparticles as a signal transducer for application in a disposable membrane strip biosensor. The size of these particles (~100 nm) was investigated by a transmission electron microscope. Electrical properties of these nanoparticles were investigated by four-point probe measurements and I-V measurements. Polyaniline-coated magnetic nanoparticles had a resistivity of 0.385 Ω cm and showed ohmic behavior. Resistance decreased with increasing concentration of polyaniline. We also demonstrated that the resistance decreased with increasing concentration of biotinylated IgG conjugated with these nanoparticles.

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