Characterization of the optical and mechanical properties of CdSe QDs/PMMA nanocomposite films
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Optical and mechanical properties of different sizes and ratios of CdSe quantum dots (QDs)/PMMA nanocomposite films were investigated. Nanocomposite films of CdSe QDs (size = 3.75–5.23 nm)/PMMA (0.05 wt.%) were fabricated using casting technique. The optical properties of both colloidal CdSe QDs and CdSe QDs/PMMA nanocomposite films were recorded using UV–visible spectrophotometer. Red shifts in the absorption edges of CdSe/PMMA films have been seen compared with those of colloidal CdSe QDs. The mechanical properties including storage modulus, loss modulus, tan δ, and stiffness of the nanocomposite films as a function of temperature were recorded using a dynamic mechanical analyzer. An improvement in storage modulus, loss modulus, and stiffness have been observed for different sizes and ratios of CdSe QDs/PMMA as a function of temperature compared with those of pure PMMA film. The intensity of tan δ peak for pure PMMA film is larger than those of the nanocomposite films. The temperature at which the tan δ peak occurs is commonly known as the glass transition temperature (Tg). Tg of CdSe QDs/PMMA nanocomposite film shifts towards higher temperature side with respect to pure PMMA film from 91 to 110 °C as CdSe QDs size decreases from 3.75 to 5.23 nm.
KeywordsPMMA High Resolution Transmission Electron Microscope Storage Modulus High Resolution Transmission Electron Microscope Dynamic Mechanical Analysis
The author wish to thank Taif University for the financial support (Grant Research No. 1/435/3524). I sincerely acknowledge helpful and useful discussion with Professor Hassan Talaat (Professor of Physics) at Ain Shams University.
- 33.M. Dixit, S. Gupta, V. Mathur, K.S. Rathore, K. Sharma, N.S. Saxena, Chalcogenide Lett. 6, 131–136 (2009)Google Scholar