Investigations on the effect of complexation of NaF salt with polymer blend (PEO/PVP) electrolytes on ionic conductivity and optical energy band gaps
Investigations on the effect of complexation of NaF salt with polymer blend (PEO/PVP) electrolytes on ionic conductivity and optical energy band gaps
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DOI：
10.1016/j.physb.2011.02.010
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发表时间：
2011-04-15
影响因子：
2.8
通讯作者：
Rao, V. V. R. Narasimha
中科院分区：
文献类型：
--
作者：
Kumar, K. Kiran;Ravi, M.;Rao, V. V. R. Narasimha
采用溶液浇铸法制备了聚氧化乙烯（PEO）和聚乙烯吡咯烷酮（PVP）与氟化钠盐复合的钠离子导电聚合物共混电解质膜。通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和紫外-可见光谱（UV-vis）证实了盐与聚合物共混物的络合作用。用阻抗分析仪在1 Hz ~ 1 MHz的频率范围和303-348 K的温度范围内测量了薄膜的电导率。据观察，电导率的大小随着盐浓度以及温度的增加而增加。利用200-800 nm的紫外-可见吸收光谱对样品的直接和间接光学带隙、光学吸收边等光学性质进行了研究。随着Na+离子浓度的增加，光学带隙减小。这表明NaF作为掺杂剂是改善PEO/PVP聚合物共混电解质电性能的良好选择。(C)2011爱思唯尔有限公司版权所有。
Sodium ion conducting polymer blend electrolyte films, based on polyethylene oxide (PEO) and polyvinyl pyrrolidone (PVP) complexed with NaF salt, were prepared using solution casting technique. The complexation of the salt with the polymer blend was confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and UV-vis spectroscopy. Electrical conductivity of the films was measured with impedance analyzer in the frequency range of 1 Hz to 1 MHz and in the temperature range of 303-348 K. It was observed that the magnitude of conductivity increased with the increase in the salt concentration as well as the temperature. UV-vis absorption spectra in wavelength region of 200-800 nm were used to evaluate the optical properties like direct and indirect optical energy band gaps, optical absorption edge. The optical band gaps decreased with the increase in Na+ ion concentration. This suggests that NaF, as a dopant, is a good choice to improve the electrical properties of PEO/PVP polymer blend electrolytes. (C) 2011 Elsevier B.V. All rights reserved.