Spectroscopic studies of pure and malachite green doped polyvinylidene fluoride samples using XRD, FTIR and UV techniques

Polyvinylidene fluoride (PVDF) and malachite green (MG) doped PVDF samples have been prepared using isothermal immersion technique and were characterized by using Fourier transform infrared (FTIR), X-ray diffraction and ultra violet techniques. FTIR spectra reveals that all stretching, bending vibrations, α and β phases are present in pure and doped PVDF samples. Dislocation density, d- spacing, micron strain and band gap using Tauc’s relation have been calculated. The change in crystalline nature and crystalline size were investigated. Amorphous nature, full width at half maximum, dislocation density and micro strain increases while crystalline size and d- spacing decreases with increasing MG in PVDF. Absorbance versus wavelength spectra of pure PVDF and malachite green doped PVDF samples have been observed in 200–800 nm wavelength range. Variation in band gap recorded in the range 4.65–472 eV. Also with increase in concentration of malachite green, band gap decreases and intensity of absorption band increases.