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Structural and Optical Properties of Starch-Sodium Alginate Embedded with Cu-Ag Core-Shell Nanoparticles

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Title Structural and Optical Properties of Starch-Sodium Alginate Embedded with Cu-Ag Core-Shell Nanoparticles
 
Creator Kaur, Navneet
Kaur, Jaspreet
Savita
Sharma, Annu
 
Subject Biodegradable
Core-Shell
Optical Energy Gap
Surface Plasmon Resonance (SPR)
Urbach’s energy
 
Description 484-489
In the past few decades, biodegradable polymers obtained from natural resources (such as chitosan, starch,
sodium alginate, cellulose, gelatin, etc.) are replacing non-degradable plastics to prevent the further degradation of the
environment. Thus, the present study focuses on the synthesis of biodegradable nanocomposites (NCs) using the blend of
Starch (St) and Sodium Alginate (SA) as matrix and copper (core)-silver (shell) nanoparticles (NPs) as nanofillers as their
distinctive surface plasmon resonance (SPR) band is observed within 350 nm-700 nm i.e. in the visible region. For the
present study, Cu (core)-Ag (shell) NPs synthesized via a chemical reduction approach were used to fabricate biodegradable
Cu-Ag@St-SA NC films via the solution casting technique. The morphological studies of the prepared core-shell NPs
were performed using Transmission Electron Microscope (TEM). The size of the Cu-Ag core-shell NPs obtained from
TEM comes out to be 18.5±3.0 nm. The NC films were further characterized by UV-Visible spectrophotometer and the
data obtained was analyzed to determine Urbach’s energy ‘Eu’, optical energy gap ‘Eg’, optical conductivity ‘σopt’,
and refractive index ‘n’. The value of ‘Eg’ for Starch-SA is found to decrease from 4.39 eV to 2.05 eV for 0.48 wt%
Cu-Ag@St-SA NC film and ‘Eu’ increases from 1.04 eV for Starch-SA to 3.03 eV for 0.48 wt% Cu-Ag@St-SA NC
film. The NC film containing 0.48 wt% Cu-Ag NPs blocks the UV radiations and thus, can be employed as a UV
filter in various devices.
 
Date 2023-08-16T11:26:01Z
2023-08-16T11:26:01Z
2023-08
 
Type Article
 
Identifier 0971-4588 (Print); 0975-1017 (Online)
http://nopr.niscpr.res.in/handle/123456789/62431
https://doi.org/10.56042/ijems.v30i3.3686
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJEMS Vol.30(3) [June 2023]