A thin interlayer of silver nanoparticles (Ag-NPs) is embedded in a matrix of poly(vinyl alcohol)(PVA)films, and its influence on the microstructural, optical, and dielectric properties of ‘Ag/PVA’ thinfilms is investigated. As evidenced from atomic force microscopy studies, size of the deposited Ag-NPsclusters and surface roughness of the films decreased with an increase of annealing temperature. Opticaland structural properties of ‘Ag/PVA’ nanocomposites were studied using UV-Visible spectroscopy andConfocal Raman spectroscope. The PVA/Ag nanocomposite films demonstrated lower optical band gapvalues than pure PVA films and the estimated optical band values of ‘Ag/PVA’ nanocomposite films decreasedfrom 3.66 eV to 3.57 eV with the increase of temperature from 20 °C to 200 °C, respectively. Themulti-layered ‘PVA/Ag-NPs/PVA’ films (MLTs) were fabricated and studied their dielectric properties as afunction of frequency. The presence of Ag-NPs inter layer shows significant influence on dielectric andconductivity properties of MLTs. At room temperature in comparison to pure PVA, MLTs exhibited threetimes higher dielectric permittivity value at 1 kHz and observed to increase 5 times with an increase intemperature to the higher value of 200 °C. The evaluated dc conductivity value of MLTs increased from−11.72 to −10.38 S/cm on a logarithmic scale with an increase in temperature from 20 °C to 200 °C, respectively.

Influence of Thin layer of Silver nanoparticles on Optical and Dielectric Properties of Poly(vinyl alcohol) Composite films

SCARAMUZZA, Nicola
2016-01-01

Abstract

A thin interlayer of silver nanoparticles (Ag-NPs) is embedded in a matrix of poly(vinyl alcohol)(PVA)films, and its influence on the microstructural, optical, and dielectric properties of ‘Ag/PVA’ thinfilms is investigated. As evidenced from atomic force microscopy studies, size of the deposited Ag-NPsclusters and surface roughness of the films decreased with an increase of annealing temperature. Opticaland structural properties of ‘Ag/PVA’ nanocomposites were studied using UV-Visible spectroscopy andConfocal Raman spectroscope. The PVA/Ag nanocomposite films demonstrated lower optical band gapvalues than pure PVA films and the estimated optical band values of ‘Ag/PVA’ nanocomposite films decreasedfrom 3.66 eV to 3.57 eV with the increase of temperature from 20 °C to 200 °C, respectively. Themulti-layered ‘PVA/Ag-NPs/PVA’ films (MLTs) were fabricated and studied their dielectric properties as afunction of frequency. The presence of Ag-NPs inter layer shows significant influence on dielectric andconductivity properties of MLTs. At room temperature in comparison to pure PVA, MLTs exhibited threetimes higher dielectric permittivity value at 1 kHz and observed to increase 5 times with an increase intemperature to the higher value of 200 °C. The evaluated dc conductivity value of MLTs increased from−11.72 to −10.38 S/cm on a logarithmic scale with an increase in temperature from 20 °C to 200 °C, respectively.
2016
A thin interlayer of silver nanoparticles (Ag-NPs) is embedded in a matrix of poly(vinyl alcohol)( PVA)films, and its influence on the microstructural, optical, and dielectric properties of ‘Ag/PVA’ thin films is investigated. As evidenced from atomic force microscopy studies, size of the deposited Ag-NPs clusters and surface roughness of the films decreased with an increase of annealing temperature. Optical and structural properties of ‘Ag/PVA’ nanocomposites were studied using UV-Visible spectroscopy and Confocal Raman spectroscope. The PVA/Ag nanocomposite films demonstrated lower optical band gap values than pure PVA films and the estimated optical band values of ‘Ag/PVA’ nanocomposite films decreased from 3.66 eV to 3.57 eV with the increase of temperature from 20 °C to 200 °C, respectively. The multi-layered ‘PVA/Ag-NPs/PVA’ films (MLTs) were fabricated and studied their dielectric properties as a function of frequency. The presence of Ag-NPs inter layer shows significant influence on dielectric and conductivity properties of MLTs. At room temperature in comparison to pure PVA, MLTs exhibited three times higher dielectric permittivity value at 1 kHz and observed to increase 5 times with an increase in temperature to the higher value of 200 °C. The evaluated dc conductivity value of MLTs increased from −11.72 to −10.38 S/cm on a logarithmic scale with an increase in temperature from 20 °C to 200 °C, respectively.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/132914
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