Electrical conductivity and microstructure of doped polyaniline (emeraldine salt)

Authors

Malou D. Catedral ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Alvin Karlo G. Tapia ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Roland V. Sarmago ⋅ PH National Institute of Physics, University of the Philippines Diliman
Jeffrey P. Tamayo ⋅ PH Institute of Chemistry, University of the Philippines Los Baños
Ernesto J. Del Rosario ⋅ PH Institute of Chemistry, University of the Philippines Los Baños

Abstract

Samples of polyaniline (emeraldine salt) were prepared with different protonic acid dopants, namely hydrochloric acid (HCl), nitric acid (HNO₃), perchloric acid (HClO₄), sulfuric acid (H₂SO₄) and hydroiodic acid (HI). Using the two-point probe method, it was found out that the samples had ohmic behaviors. The electrical conductivities were measured using the Van der Pauw Method. The undoped sample had a conductivity of 5x10^-4 S/cm. The highest conductivity of 109.04 S/cm was observed for the HClO₄-doped sample while the lowest value (0.02 S/cm) was obtained for the HI-doped sample. These conductivities were inversely proportional to the energy gap between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). Scanning electron microscopy revealed significant differences among the samples in terms of shapes and morphologies.

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Issue

2004: Proceedings of the 22nd Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2004-PA-12

Section

Poster Session PA

Published

2004-10-25

How to Cite

[1]

MD Catedral, AKG Tapia, RV Sarmago, JP Tamayo, and EJ Del Rosario, Electrical conductivity and microstructure of doped polyaniline (emeraldine salt), Proceedings of the Samahang Pisika ng Pilipinas 22, SPP-2004-PA-12 (2004). URL: https://proceedings.spp-online.org/article/view/SPP-2004-PA-12.