Abstract
Stevia rebaudiana plant leaves were used for biosynthesis of gold nanoparticles (AuNPs). Transmission electron microscope images showed various shapes and sizes of AuNPs. Various amounts of AuNPs were added to polyvinyl alcohol/carboxymethylcellulose (PVA/CMC, 40/60) via the casting method. The X-ray diffraction (XRD) spectrum of pure blend shows the amorphous nature of the blend. FTIR spectra showed the interaction between PVA/CMC and AuNPs. The ultra-violet and visible spectra showed emerging new peak of surface plasmon resonance of AuNPs for the filled samples. The scanning electron microscope images showed bright spots on the sample’s surface, which was attributed to AuNPs. AC conductivity exhibited enhancement after the addition of gold nanoparticles. The ε′ and ε″ were reduced with increasing the frequency due to direction dipoles of applied electric field. Because of the mobile charges inside the polymeric backbone, higher values of ε′ and ε″ were observed at low frequencies. The tanδ showed increased with an increase in AuNPs concentration and decrease at high frequency, as expected.
Highlights
Solid polymer electrolytes (SPEs) based on biopolymers have emerged as promising materials due to their potential applications in electrochemical devices[1,2]
The AuNPs were created using Stevia rebaudiana leafs extract, which was confirmed by occurrence the surface plasmon resonance (SPR) of NPs in UV-Vis. spectrum and from the Transmission electron microscope (TEM) micrograph
X-ray diffraction (XRD) measurement of nanocomposites films exhibited the decrease in the crystallinity after embedded the AuNPs due to the change in the crosslink density of PVA/Carboxymethyl cellulose (CMC)
Summary
Preparation of the extract of plant leaves and AuNPs green synthesis The leaves of Stevia rebaudiana plant were washed fully thrice with DDW. 5 ml of Stevia rebaudiana leaves extract was added to 0.1 liliter of 1mM Tetrachloroauric acid in stopper-flask, and the color of the solution changes from yellow to a pinkish-red solution. This change denotes the production of AuNPs 2.3. X-ray diffraction pattern of the prepared samples has been recorded at room temperature using DIANO corporation-USA with Cu-Kα radiation in the Bragg angle 2 10 to 80. Conductivity measurement was carried out in the 1Hz10MHz range through broadband dielectric spectroscopy (Novo control Turnkey Concept 40 System)
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