The effect of poly vinyl alcohol matrix on the light absorbance of Ag2S nanoparticles; experimental and discrete dipole approximation results


Siabi-Garjan A., Fakhri-Mirzanagh S., Azizian-Kalandaragh Y.

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, vol.222, pp.26-34, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 222
  • Publication Date: 2019
  • Doi Number: 10.1016/j.jqsrt.2018.10.018
  • Title of Journal : JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
  • Page Numbers: pp.26-34

Abstract

Well-ordered films of silver sulfide (Ag2S) nanoparticles (NPs) embedded in the matrix of poly vinyl alcohol (PVA) were fabricated using Successive Ionic Layer Adsorption and Reaction (SILAR) technique. Enlarging the size and increasing the concentration of Ag2S NPs by increasing the number of SILAR cycles confirmed by surface scanning electron microscopy (SEM) images of the produced films. The material composition was studied using energy dispersive X-ray (EDX) analysis. UV-visible experimental spectra of samples were compared with discrete dipole approximation (DDA) calculations results and good agreements were achieved. Increasing the number of peaks and valleys and redshift of peaks by increasing the number of SILAR cycles were obviously observed from the results. The most interesting conclusion of this work raised from electric near-field contour distributions investigations and implies that a matrix of insulator material (PVA) can cause an asymmetry in the intensity distribution of electric field around Ag2S NPs and let more dipole oscillations happen and more peaks appear in extinction/absorption spectra. (C) 2018 Elsevier Ltd. All rights reserved.