scholarly journals Synthesis, characterization and study of optical properties of polyvinyl alcohol/ CaF2 nanocomposite films

2012 ◽  
Vol 19 (6) ◽  
pp. 1979-1983 ◽  
Author(s):  
O. Nakhaei ◽  
N. Shahtahmassebi ◽  
M. Rezaeeroknabadi ◽  
M.M. Bagheri Mohagheghi
Keyword(s):  
Optical Properties ◽  
Polyvinyl Alcohol ◽  
Nanocomposite Films

Synthesis, characterization and optical properties of polyvinyl alcohol–cerium oxide nanocomposite films

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74354-74366 ◽  
Author(s):  
K. S. Hemalatha ◽  
K. Rukmani
Keyword(s):  
Optical Properties ◽  
Polyvinyl Alcohol ◽  
Cerium Oxide ◽  
Nanocomposite Films ◽  
Solution Casting ◽  
Uv Filters ◽  
Casting Method ◽  
Solution Casting Method

PVA–CeO2 nanocomposite films were synthesized by solution casting method and exhibit tape like nanoribbon structure in the 25 wt% CeO2 films. The 2.5 wt% and 25 wt% CeO2 films are suitable for UV filters while the 2.5 wt% film shows highest photoluminescence.

Effect of gamma radiation on the structural, thermal and optical properties of PMMA/Sn0.75Fe0.25S2 nanocomposite

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali A. Alhazime ◽  
Nesreen T. El-Shamy ◽  
Kaoutar Benthami ◽  
Mai ME. Barakat ◽  
Samir A. Nouh
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
Gamma Irradiation ◽  
Optical Band Gap ◽  
Color Variation ◽  
Nanocomposite Films ◽  
Color Changes ◽  
Gamma Irradiated ◽  
Intermolecular Crosslinking ◽  
Amorphous Part

AbstractNanocomposite films of polymethylmethacrylate PMMA with Sn0.75Fe0.25S2 nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Changes in PMMA/Sn0.75Fe0.25S2 nanocomposite (NCP) due to gamma irradiation have been measured. XRD results indicate that the gamma doses of 10–80 kGy cause intermolecular crosslinking that reduces the ordered portion in the NPs. Bonding between the NPs and the host PMMA was confirmed by FTIR. TGA results indicate an enhancement in thermal stability in the NCP films irradiated with doses 20–80 kGy. The optical band gap was reduced from 3.23 to 2.47 eV upon gamma irradiation up to 80 kGy due bonding between the NPs and PMMA which enhanced the amorphous part of the NPs. Finally, the color variation between the blank and irradiated films (ΔE) was determined. Color changes immensely when the PMMA/Sn0.75Fe0.25S2 NCP films are gamma irradiated. Values of ΔE were as much as 31.6 which is an acceptable match in commercial reproduction on printing presses.

Optical properties of diamond like carbon and diamond like nanocomposite films

2009 ◽  
Vol 6 (12) ◽  
pp. 2817-2819
Author(s):  
Asta TamulevicÌŒienė ◽  
SÌŒaruÌ„nas MesÌŒkinis ◽  
Vitoldas Kopustinskas ◽  
Sigitas TamulevicÌŒius
Keyword(s):  
Optical Properties ◽  
Nanocomposite Films ◽  
Diamond Like Carbon

Enhancement of optical properties of poly (9,9′-di-n-octylfluorenyl-2,7-diyl) in conjugated polymer/TiO2 nanocomposites

2014 ◽  
Vol 92 (9) ◽  
pp. 1021-1025 ◽  
Author(s):  
Bandar Ali Al-Asbahi ◽  
Mohammad Hafizuddin Haji Jumali
Keyword(s):  
Optical Properties ◽  
Conjugated Polymer ◽  
Emission Spectra ◽  
Treatment Temperature ◽  
Nanocomposite Films ◽  
Glass Substrates ◽  
Solution Blending ◽  
Heat Treated ◽  
Blending Method ◽  
Splitting Energy

The influence of colloidal TiO2 nanoparticle contents on the optical properties of poly (9,9′-di-n-octylfluorenyl-2,7-diyl) conjugated polymer (PFO) has been investigated. The solution blending method was used to prepare homogenous PFO/TiO2 nanocomposite. The nanocomposite films were prepared on glass substrates using the spin-coating technique. The films were divided into two groups, the first was left to dry at room temperature while the second was heat-treated at 120 °C for 1 h. Absorption and emission spectra showed that the PFO existed in α- and β-phases morphology having monomeric, excimeric, and double excimeric states. In addition, both spectra revealed that TiO2 contents and heat treatment temperature extended the conjugation length of PFO. Finally, emission spectra for both cases exhibited decreasing in the line width of zero-phonon emission spectra and increasing in the vibronic splitting energy, upon increment of the TiO2, led to a significant increase in π-electron delocalization and lower degree in chain disorder.

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