Destruction of percolative network using green synthesized gold nanoparticles: Formation of high dielectric material

作者：Uddin Md Jamal; Middya Tapas Ranjan; Chaudhuri Bijaykrishna^*; Sakata Hironobu

来源：Polymer, 2014, 55(1): 15-21.

DOI：10.1016/j.polymer.2013.11.013

• Biosynthesis
• AuNPs
• Polymer nanocomposite film

Gold nanoparticles (AuNPs) of about 5 nm in diameter were biosynthesized at room temperature (300 K). The PVA/2.5 wt% KH2PO4 or KDP composite film and PVA/2.5 wt% KDP/AuNPs nanocomposite films with different concentrations of AuNPs were prepared. Interestingly, addition of 0.05 wt% of AuNPs to the PVA/2.5 KDP percolative composite film destroys percolative behavior of this composite film. Furthermore, the PVA/2.5 wt% KDP/0.05 wt% AuNPs nanocomposite film exhibited high room temperature dielectric permittivity (epsilon%26apos; similar to 590 at 1 kHz). The behavior of AC conductivity (sigma(ac)) of the nanocomposite films indicated correlated barrier hopping type of conduction mechanism. The Cole-Davidson dielectric response becomes evident as the interfacial polarization process acquires a more symmetric form, tending to Debye relaxation. High value of epsilon%26apos; promises direct application in capacitors. Moreover, the novel feature of destroying the percolative behavior by AuNPs may be applied even in other systems.

• 出版日期2014-1-14