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Soluble silicon nanoparticles–polyaniline capsules for biosensing and imaging

Published online by Cambridge University Press:  19 October 2012

Noha Elhalawany
Polymers and Pigments Department, Chemical Industrial Division, National Research Center, Cairo 12311, Egypt
Yulia Maximenko
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Zain Yamani
Center of Excellence for Nanotechnology, KFUPM, Dhahran 31261, Saudi Arabia
Siu-Tung Yau
Department of Electrical Engineering, Cleveland State University, Cleveland, Ohio 44115
Munir H. Nayfeh*
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
a)Address all correspondence to this author. e-mail:
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We used miniemulsion to synthesize novel water-soluble dispersion of nanocapsules with a polyaniline (PANI) shell and luminescent ultrasmall Si nanoparticle core with diameters of 50–300 nm. The capsules are functionalized with aromatic sulfonic acid. The capsules may be reconstituted in thin films or structured surfaces. The stability of the luminescence and dispersion of the capsules is studied under a wide range of pH conditions. The multiplicity of nanoparticles in the core provides highly amplified and reproducible signal for luminescence-based imaging using standard fluorescence microscopy, while the PANI shell allows a variety of routes for functionalization as well as electrical interrogation, which enables a wide range of biosensing/imaging applications.

Copyright © Materials Research Society 2012

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