Synthesis And Characterization Of Highly Crystalline Polyaniline Film Promising For Humid Sensor

S.K. Shukla1*, Anand Bharadvaja1, Ashutosh Tiwari2,3, G.K. Parashar4, G.C. Dubey5

1Bhaskaracharya College of Applied Science, University of Delhi, New Delhi 110 075, India

2School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212 013, China

3National Institute for Materials Science, Tsukuba, Ibaraki 305 0047, Japan

4Swami Shradhanand College, University of Delhi, Delhi 110 036, India

5Institute of Defense Scientists and Technologists, CFEES, S.K. Mazumdar Road, Delhi 110 054, India

Adv. Mater. Lett., 2010, 1 (2), pp 129-134

DOI: 10.5185/amlett.2010.3105

Publication Date (Web): Apr 08, 2012

E-mail: sarojshukla2003@yahoo.co.in

Abstract


Polyaniline (PANI) was prepared in emeraldine via chemical oxidation method using CuSO4 as initiating agent. The chemical characterizations were made using UV-vis (ultraviolet-visible spectrophotometry), FT-IR (Fourier transform spectroscopy), TG-DTA (thermo-gravimetric/differential thermal analysis), ESI-MS (electrospray ionization mass spectrometry), XRD (X-ray diffraction), SEM (scanning electron microscopy) techniques. The results revealed the formation of homogeneous, crystalline PANI with sub-micron size particles. The PANI thin film of 0.5 µm thickness has been fabricated using spin coating technique. The resulting PANI film was exposed to controlled humid condition and change in resistance has been recorded. The resistance was continuously decreased from 13.5 to 3.75 MΩ with a linear change in humidity ranging from 3 to 95%. The result was reproducible and checked by repeating observation.

Keywords

Polyaniline, crystallinity, resistance, humidity sensor

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