Fluorescence microscopy and photodielectric characterization studies of the composite films of polyvinyl alcohol and tryptophan functionalized silver nanoparticles

Fluorescent nanocomposite films were prepared by solution mixing of polyvinyl alcohol (PVA) and tryptophan functionalized silver (AgTrp) nanoparticles. Synchrotron excitation deep-ultraviolet (DUV) fluorescence imaging was used to follow the distribution AgTrp nanoparticles within polymer matrix. Pronounced growth dendrite-like structures in presence confirmed bright field as well with atomic force microscopies. Both influence thermal properties Differential scanning calorimetry measurements showed that they reduce crystallinity significantly increase glass transition temperature PVA (in case PVA-AgTrp film Tg increases ~20 °C). Dielectric studied under two different conditions (dark illumination). The illumination 250 nm light induces a significant conductance nanocomposite. relative changes, respect measured dark, almost ~200%.