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

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• 作者：Md Jamal Uddin ; Tapas Ranjan Middya ; Bijaykrishna Chaudhuri ; Hironobu Sakata
• 关键词：Biosynthesis ; AuNPs ; Polymer nanocomposite film
• 刊名：Polymer
• 出版年：14 January, 2014
• 年：2014
• 卷：55
• 期：1
• 页码：15-21
• 全文大小：1526 K

文摘

Gold nanoparticles (AuNPs) of about 5聽nm in diameter were biosynthesized at room temperature (300聽K). The PVA/2.5聽wt% KH₂PO₄ or KDP composite film and PVA/2.5聽wt% KDP/AuNPs nanocomposite films with different concentrations of AuNPs were prepared. Interestingly, addition of 0.05聽wt% of AuNPs to the PVA/2.5聽wt% KDP percolative composite film destroys percolative behavior of this composite film. Furthermore, the PVA/2.5聽wt% KDP/0.05聽wt% AuNPs nanocomposite film exhibited high room temperature dielectric permittivity (蔚鈥猜犫埣聽590 at 1聽kHz). The behavior of AC conductivity (蟽_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 蔚鈥?promises direct application in capacitors. Moreover, the novel feature of destroying the percolative behavior by AuNPs may be applied even in other systems.