Abstract
In this article, we report the synthesis of polyvinyl alcohol–silver nanodendrites by two-step photochemical method using three different wavelengths of irradiation. These composite silver nanodendrite films have been characterized by TEM, XRD, UV–visible, and photoluminescence (PL) spectra. Fractal phenomena have been investigated by box-counting method from the TEM images. Electrical transport in these films is investigated through current–voltage (I–V) and photoconductivity measurements. TEM images reveal the formation of well-shaped hyperbranched dendrites with lengths of 14–15 micrometers. The fractal dimensions calculated from TEM pictures are found to be in the range of 1.55–1.62 for the three different films. XRD shows characteristic (111) peak for silver at 2θ = 38°. UV–Vis spectra show a broad band centered at 435 nm. PL spectra show an emission band at 660 nm when excited at 320 nm. I–V is found to be ohmic. Negative photoconductivity is observed with a linear dependence of current on intensity of light.
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