Abstract
Polyaniline (PANI) plays major role in the field of wide range of applications because of its versatile and flexible properties. In present work, PANI powder is synthesized by tuning its synthesis parameters such as constant oxidant-monomer ratio (1.25), lower bath temperature (0 -5°C), variation in HCL acid concentration and changing washing treatment. It is crucial to control the synthesis parameters to obtain the desired value of conductivity and dielectric properties in order to improve the microwave absorption performance. The negative permittivity is appeared in the prepared PANI samples. The structural and surface topography characterizations were carried through different techniques including FTIR, Micro Raman and Bio-AFM analysis. Microwave absorption characteristics of PANI samples were studied using a vector network analyzer in the Ku band (12-18 GHz) region. Surface topography studies show the granular topography for PANI samples. Sample P2 with 0.5M HCL concentration has a maximum conductivity of 11.37 S.cm−1 and showed minimum reflection loss of -50.73 dB (99.99% microwave absorption) at 13.79 GHz frequency with 5mm thickness. These findings reveal that microwave properties of PANI material can be improved by tuning its synthesis parameters.
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