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Structural and Optical Features of Sago Starch Polymer Nanocomposites Embedded with Silicon Carbide Nanoparticles

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Title Structural and Optical Features of Sago Starch Polymer Nanocomposites Embedded with Silicon Carbide Nanoparticles
 
Creator Savita
Kaur, Navneet
Kaur, Jaspreet
Sharma, Annu
 
Subject Nano composites
Sago-starch
Optical band gap
Urbach’s energy
Dielectric permittivity
Dielectric tangent loss
 
Description 468-473
In the present work, biodegradable polymer sago starch based polymer nanocomposite films reinforced with Silicon
Carbide (SiC) nanoparticles were synthesized via solution casting method. The resulting polymer nanocomposite films were
characterized utilising transmission electron microscopy, X-ray diffraction, UV-VIS-NIR absorption spectroscopy and
dielectric spectroscopy. The data obtained from UV-VIS-NIR absorption spectrophotometer was further used to compute
optical parameters such as absorption coefficient (α), optical energy gap (Eg) and Urbach’s energy (EU). Further the
transmittance spectra of sago-starch SiC nanocomposite film displayed a sharp decrease in UV region and it decreased from
83.68% to 12.70% at wavelength of 600 nm. Eg of sago-starch film decreased from 4.31 eV to 2.57 eV and EU increased
from 0.66 eV to 1.6 eV with addition of 1 wt% of SiC nanoparticle in sago starch. This is attributed to the additional defects
created in HOMO-LUMO gap of polymer matrix. Dielectric spectroscopy results were used to compute dielectric
permittivity and dielectric tangent loss. The dielectric permittivity of sago starch increased with addition of SiC
nanoparticles while dielectric tangent loss increased at lower frequencies and decreased at higher frequencies and the
relaxation peak moved towards the high-frequency side suggesting a decrease in relaxation time.
 
Date 2023-08-16T11:28:19Z
2023-08-16T11:28:19Z
2023-08
 
Type Article
 
Identifier 0971-4588 (Print); 0975-1017 (Online)
http://nopr.niscpr.res.in/handle/123456789/62433
https://doi.org/10.56042/ijems.v30i3.3695
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJEMS Vol.30(3) [June 2023]