Role of Ion Dissociation on DC Conductivity and Silver Nanoparticle Formation in PVA: AgNt Based Polymer Electrolytes: Deep Insights to Ion Transport Mechanism
Role of Ion Dissociation on DC Conductivity and Silver Nanoparticle Formation in PVA: AgNt Based Polymer Electrolytes: Deep Insights to Ion Transport Mechanism
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DOI：
10.3390/polym9080338
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发表时间：
2017-08-01
期刊：
影响因子：
5
通讯作者：
Ahmed, Hameed M.
中科院分区：
文献类型：
--
作者：
Aziz, Shujahadeen B.;Abdullah, Ranjdar M.;Ahmed, Hameed M.
本研究详细讨论了离子解离对PVA: AgNO3基固体聚合物电解质中银纳米颗粒的形成和直流电导率的影响。采用溶液铸造法制备了银离子导电固体聚合物电解质样品。利用紫外-可见吸收光谱研究了纳米银的形成。由于等离子体银纳米粒子受到离子解离，已经观察到宽而尖锐的峰。讨论了介电常数对银纳米粒子表面等离子体共振峰强度的影响。阻抗图显示，随着盐浓度的增加，高频半圆直径减小。还解释了直流电导率与介电常数的关系。根据交流电导率谱，估计直流电导率与体电阻计算的电导率接近。研究了直流电导率的温度依赖性，发现在两个不同的区域内遵循Arrhenius方程。研究了不同温度下的交流电导率，以了解离子的传导机理。发现交流电导率随频率的变化符合Jonscher的普遍幂律。从交流电导率谱中可以识别出三个不同的区域。计算了所测交流电导率谱色散区的频率指数S。讨论了各种模型来解释S值随温度的变化规律。然后使用S值随温度的行为来解释1000/T下的直流电导率模式。最后，通过计算得到的活化能E-a和最大势垒高度W-m的对比，可以对离子传导机理有更深入的了解。
In this study, the role of ion dissociation on formation of silver nanoparticle and DC conductivityin PVA: AgNO3 based solid polymer electrolyte has been discussed in detail. Samples of silver ion conducting solid polymer electrolyte were prepared by using solution cast technique. Absorption spectroscopy in the ultraviolet-visible (UV-Vis) spectral region was used to investigate the formation of silver nanoparticles. Broad and sharp peaks due to plasmonic silver nanoparticles subjected to ion dissociation have been observed. The influence of dielectric constant on the intensity of surface plasmonic resonance (SPR) peaks attributed to silver nanoparticles was discussed. From impedance plots, the diameter of high frequency semicircle was found to be decreased with increasing salt concentration. The DC conductivity in relation to the dielectric constant was also explained. From the AC conductivity spectra, the dc conductivity was estimated to be close to that calculated from the bulk resistance. The temperature dependence of the DC conductivity was studied and found to follow Arrhenius equation within two distinguished regions. The AC conductivity at different temperatures has been studied to comprehend the ion conduction mechanism. The AC conductivity against frequency was found to obey the universal power law of Jonscher. Three distinct regions were recognized from the spectra of AC conductivity. The frequency exponent (S) was calculated for the dispersive region of the measured AC conductivity spectra. Various models were discussed to explain the behavior of S value with temperature. The behavior of S value with temperature was then used to interpret the DC conductivity pattern against 1000/T. Finally, from the comparison of calculated activation energy (E-a) and maximum barrier height (W-m), deep insights into ion conduction mechanism could be grasped.