Analysis on Spectroscopic and Dielectric Study of PbS/PVA Polymer Nanocomposite via Facile

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Mechanics, Materials Science & Engineering, July 2017 – ISSN 2412-5954

Analysis on Spectroscopic and Dielectric Study of PbS/PVA Polymer Nanocomposite via Facile Hydrothermal Process 1 S. Sharon Tamil Selvi 1, J. Mary Linet1,a 1 – Department of Physics, Loyola College, Chennai, India a – linet.mary@gmail.com DOI 10.2412/mmse.11.28.806 provided by Seo4U.link

Keywords: lead sulphide, polyvinyl alcohol, hydrothermal technique, electrical property.

ABSTRACT. Lead Sulfide (PbS) nanoparticles have received much attention owing to their attractive nonlinear optical properties. The present study reports the synthesis of PbS/ Polyvinyl alcohol (PVA) nanocomposite through hydrothermal technique and characterized byX-ray diffraction (XRD), High Resolution Transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR), UV-Visible spectroscopy (UV-Vis) and Dielectric analysis. XRD spectra revealed the formation of cubic phase of PbS nanoparticles in PVA polymer matrix with average crystallite size was found to be 28 nm. HRTEM analysis confirmed the formation of cubic particles with the average diameter of 30 ± 2.45 nm. FTIR spectra confirmed the presence of organic molecules on the PbS nanoparticles. The UV-vis absorption spectra of the PbS/PVA nanocomposite exhibit a significant blue shift from bulk PbS. The electrical property of the material was studied briefly using dielectric measurements and it reveals that the dielectric constant of PbS in the PVA matrix is maximum at lower frequency and decreases with increase in frequency. The higher value of dielectric loss at lower frequency and the decrease of dielectric loss with frequency are due to the free charge motion within the material. AC conductivity of PbS in polymer matrix increases with increase in frequency.

Introduction. Nanoscience is concerned with the study of the unique properties of matter at its nano level and it utilizes to craft novel structures, devices and systems. The usage of nanoparticles as polymer fillers relates to the well-built contemporary interest in progress and application of novel materials [1]. Polymer nanocomposites are diverse and versatile functional materials in which nanoscale inorganic particles are dispersed in an organic polymer matrix to enhanced optical, mechanical, magnetic, and optoelectronic properties [2]. Prologue of stabilizers persuade on the chemical properties and physical properties of semiconductor materials. Capping agents with strong binding molecule form dense layer on the particle surface that stabilizes nanoparticles better, while weak binding molecule consequence fast particle growth leading to large nanoparticles size and aggregation [3]. Hence, the choice of a pertinent capping agent and its concentration becomes the requirement for particle size regime, stabilization against aggregation and high quantum yield during synthesis of nanoparticles [4]. The semiconductor materials have attracted fabulous curiosity owing to its size and shape dependent optical and electronic properties. Among them, Lead sulphide (PbS) is an significant IV–VI semiconductor owe to its narrow band gap (0.41 eV) and large Bohr excitonic radius (18 nm), which leads to potential applications in electroluminescence devices, infrared (IR) detectors, solar absorbers, Pb2+ ion selective sensor and photography [5]. Besides, it has extensive applications in optical devices such as optical switch due to its non-linear optical properties. Properties of PVA (polyvinyl alcohol) like the transparency over the whole visible spectrum, good adhesion to hydrophilic surfaces, formation of oxygen resistant films and water soluble makes a good choice for the fabrication of optical devices and colloidal stabilizer [6]. For the materialization of PVA/PbS nanoparticles facile hydrothermal method was utilized and it is well known that the hydrothermal technique is an environment affable method for preparation of materials since reactions 1

© 2017 The Authors. Published by Magnolithe GmbH. This is an open access article under the CC BY-NC-ND license http://creativecommons.org/licenses/by-nc-nd/4.0/

MMSE Journal. Open Access www.mmse.xyz


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