Exceptionally crystalline and conducting acid doped polyaniline films by level surface assisted solution casting approach

Journal Article · Mon Apr 18 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4947083· OSTI ID:22591597

Puthirath, Anand B.; Varma, Sreekanth J.; Methattel Raman, Shijeesh ^[1]

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1. Nanophotonic and Optoelectronic Devices Laboratory, Department of Physics, Cochin University of Science and Technology, Cochin, Kerala 682022 (India)

Emeraldine salt form of polyaniline (PANI) was synthesized by chemical oxidative polymerisation method using ammonium persulfate as oxidant. Resultant emeraldine salt form of PANI was dedoped using ammonia solution and then re-doped with camphor sulphonic acid (CSA), naphthaline sulphonic acid (NSA), hydrochloric acid (HCl), and m-cresol. Thin films of these doped PANI samples were deposited on glass substrates using solution casting method with m-cresol as solvent. A level surface was employed to get homogeneous thin films of uniform thickness. Detailed X-ray diffraction studies have shown that the films are exceptionally crystalline. The crystalline peaks observed in the XRD spectra can be indexed to simple monoclinic structure. FTIR and Raman spectroscopy studies provide convincing explanation for the exceptional crystallinity observed in these polymer films. FESEM and AFM images give better details of surface morphology of doped PANI films. The DC electrical conductivity of the samples was measured using four point probe technique. It is seen that the samples also exhibit quite high DC electrical conductivity, about 287 S/cm for CSA doped PANI, 67 S/cm for NSA doped PANI 65 S/cm for HCl doped PANI, and just below 1 S/cm for m-cresol doped PANI. Effect of using the level surface for solution casting is studied and correlated with the observed crystallinity.

• OSTI ID: 22591597
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 108; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMMONIA
ATOMIC FORCE MICROSCOPY
CASTING
CRESOLS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
FOURIER TRANSFORMATION
INFRARED SPECTRA
MATHEMATICAL SOLUTIONS
MONOCLINIC LATTICES
MORPHOLOGY
PERSULFATES
POLYMERIZATION
RAMAN SPECTROSCOPY
SOLVENTS
SURFACES
THICKNESS
THIN FILMS
X-RAY DIFFRACTION