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Polypyrrole – porous silicon nanocomposites

C. POPA1,* , R. TURCU2, I. CRACIUNESCU2, A. NAN2, M. L. CIUREA3, I. STAVARACHE3, V. IANCU4

Affiliation

  1. Technical University, Cluj-Napoca 3400, Romania
  2. National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca 5, 400293 Romania
  3. National Institute for Research and Development of Materials Physics, Bucuresti-Magurele 077125, Romania
  4. University “Politehnica” of Bucharest, Bucharest 060042, Romania

Abstract

In this work we report the synthesis and characterization of the polypyrrole – porous silicon nanocomposites. Our main goal is to control the growth of conducting polypyrrole into the alveolar pores of porous silicon, in order to get a functionalized nanocomposite with the required properties for application as electrode in microfluidic devices. Porous silicon was electrochemically etched from (100) p-type silicon wafers. Different silicon resistivities (from 1.8 to 11 Ω·cm) and preparation conditions (different electrolyte concentrations and current densities) were used. The electrodeposition of polypyrrole into porous silicon was carried out galvanostatically, at a constant current density 2.5 mA/cm2 from a solution containing acetonitrile, the monomer, pyrrole and p-toluensulfonic acid as electrolyte. The polymerization time was varied in order to investigate the growing process of polypyrrole into the pores. The morphology and of the as-prepared nanocomposites was investigated by SEM. The existence of PPY into porous silicon is evidenced by the EDX spectra of the nanocomposite. The electrical characterization evidences the relative contributions of the polypyrrole and the substrate resistivity, respectively..

Keywords

Polypyrrole, Porous silicon, Microfluidic devices.

Submitted at: Feb. 25, 2008
Accepted at: Aug. 28, 2008

Citation

C. POPA, R. TURCU, I. CRACIUNESCU, A. NAN, M. L. CIUREA, I. STAVARACHE, V. IANCU, Polypyrrole – porous silicon nanocomposites, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 9, pp. 2319-2324 (2008)