Anomalous electrical properties of poly vinyl alcohol films with Tb³⁺ ions and copper nanoparticles in different solvents

Abstract

Laser ablation was used to fabricate copper nanoparticles (NPs) in different solvents from sodium lauryl sulphate, acetone and ethanol by applying 1064 nm radiation from a Nd:YAG laser. The sizes and shapes of the colloidal Cu NPs were investigated by transmission electron microscopy (TEM). The electrical conductivities of Tb 3+ in polymer films with Cu NPs were measured in the frequency range of 20 Hz to 1 MHz and the temperature range of 308-343 K. It was found that the electrical conductivity of Tb 3+ was greater for larger Cu NPs with sizes ranging from 20-40 nm in ethanol as compared to Cu NPs with smaller dimensions formed in the other two solvents. It was concluded that using ethanol as the solvent enhanced the electrical conductivity of Tb 3+ in the polymer film. The activation energy as well as the variation in the loss tangent with temperature also explains the enhanced electrical conductivity.

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

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Bismuth functionalized PVA film: field, plasmonic and pH effect on PVA originated broad photoluminescence

“…The detailed experimental procedure is described in our earlier work. 16,24 In brief bismuth metal plate was washed with acetone and deionized water for removing organic contaminants. The target was placed in the bottom of a beaker lled with 10 ml solution at different pH (triple distilled water and water with few drops of HCl or NaOH) under constant stirrer.…”

“…14 Bi NPs exhibit absorption in the UV region. 15,16 The absorption peak shis towards lower wavelengths in the case of smaller Bi NPs and, vice versa. The stability of Bi NPs decreases with a decrease in its particle size (due to enhanced surface to volume ratio).…”

Spectroscopic Investigations on Polyvinyl Alcohol Film with Complex of Terbium Ions along with Bismuth Nanoparticles for Improved Green Emission

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