کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5360086 | 1503687 | 2013 | 5 صفحه PDF | دانلود رایگان |
- Optical properties were investigated doped polymer films in the wavelength range of 200-400Â nm.
- A energy gaps and band edge values shifted to lower energies on doping.
- LiPF6, EC and CNT are responsible for the formation of defects in polymer electrolytes.
- Increase in the degree of disorder in the films.
Polyethylene oxide (PEO) based solid polymer electrolyte films complexed with lithium hexafluorophosphate (LiPF6), ethylene carbonate (EC) and carbon nanotubes (CNTs) are prepared by solution-casting technique. The complexation of doping materials with polymer is confirmed by X-ray diffraction and infrared studies. The incorporation of LiPF6, EC and CNTs into the host polymer shows a significant increase in conductivity of 10â10 and 10â3Â SÂ cmâ1. The optical properties such as direct and indirect band gaps are investigated for pure and doped polymer films within a wavelength range of 200-400Â nm. It is found that the energy gaps and band edge values shift towards lower energies upon doping. It is shown that LiPF6, EC and CNTs are responsible for the formation of defects in polymer electrolytes, which increases the degree of disorder in the films.
Optical band decrease from 5.92 to 4.60Â eV for direct optical band gap and from 5.70 to 4.42Â eV for indirect optical band gap. Decrease in the band gap is caused by an alloying effect such as LiPF6, EC and CNT.
Journal: Applied Surface Science - Volume 276, 1 July 2013, Pages 323-327