• D Sarkar

      Articles written in Bulletin of Materials Science

    • Size variation of polyaniline nanoparticles dispersed in polyvinyl alcohol matrix

      J Bhadra D Sarkar

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      We report the preparation of polyaniline (PANI) nanoparticles dispersed in polyvinyl alcohol (PVA) matrix. From SEM picture it is seen that the particle sizes vary from 100–20 nm. Also with increase in PVA content the stability of dispersion is found to increase. Apart from SEM, spin cast films of PANI in PVA are also characterized through XRD and FTIR. XRD shows increase in crystallinity with PVA content and FTIR gives evidence of crosslinking between PANI and PVA molecules. In plane electrical conductivity (in the range of 102 Scm-1) and the exponent of nonlinear 𝐼–𝑉 are found to decrease with increase of PVA content. There is a good correlation between SEM, XRD, FTIR and electrical properties.

    • Structural and optical properties of zinc sulphide–polyvinyl alcohol (ZnS–PVA) nanocomposite thin films: effect of Zn source concentration

      U Baishya D Sarkar

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      ZnS–PVA nanocomposite thin films are grown by chemical bath deposition (CBD) method by varying the concentration of zinc source. Formation of nanocrystalline hexagonal ZnS is confirmed by X-ray diffraction. Hexagonal form is predominant at some lower concentration. The morphological properties of the films are determined by transmission electron microscope (TEM). The particle size as given by TEM indicates increase in particle size. Bandgap measured from UV-Visible transmission spectra shows a decreasing trend with decrease of Zn source concentration. Photoluminescence (PL) measurement showed blue emission centred at 417 nm and that the intensity decreases with decrease in Zn source concentration.

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