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A Polyaniline-based Sensor of Nucleic Acids
07:58

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

Novel microstructure in spin coated polyaniline thin films.

Deepak Verma1, V Dutta

  • 1Photovoltaic Laboratory, Centre for Energy Studies, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 22, 2011
PubMed
Summary

Polyaniline (Pani) thin films doped with camphor sulfonic acid (CSA) were fabricated via spin coating. Film morphology and optical properties were tuned by adjusting spin rates, revealing a hexagonal structure and specific electronic transitions.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Polyaniline (Pani) is a conductive polymer with diverse applications.
  • Doping with camphor sulfonic acid (CSA) enhances Pani's properties.
  • Controlling film morphology is crucial for optimizing performance.

Purpose of the Study:

  • To investigate the effect of spin coating parameters on Pani-CSA thin films.
  • To characterize the structural and optical properties of the films.
  • To understand the relationship between morphology and electronic transitions.

Main Methods:

  • Chemical synthesis of polyaniline (Pani) via oxidation at 0°C.
  • Deposition of Pani-CSA thin films on glass substrates using spin coating.
  • Characterization using scanning electron microscopy (SEM) and optical absorption spectroscopy.

Main Results:

  • Pani-CSA films exhibited a hexagonal structure attributed to CSA crystalline growth.
  • Film density decreased with increasing spin rates (800 to 2000 rpm).
  • An absorption shoulder around 900 nm, linked to quinoid unit transitions, appeared at higher spin rates.

Conclusions:

  • Spin coating parameters significantly influence the morphology of Pani-CSA films.
  • The observed structural changes correlate with alterations in optical absorption spectra.
  • This study provides insights into tailoring conductive polymer films for specific electronic applications.