Photoluminescence decay time studies on ZnS in cubic and hexagonal phase and its mechanico‐chemical interaction with polyaniline

Abstract

We report new photoluminescence (PL) data generated by pulsed optical excitation on the composites achieved by a mechanico-chemical reaction between ZnS in the cubic (c) and wurtzite (w) phases and polyaniline-emeraldine base (PANI-EB). Under continuous and pulsed optical excitation, powders of the (w)ZnS and (w)ZnS/PANI-EB composites display PL with different spectral compositions. Contrary to expectations, the (c)ZnS and the (c)ZnS/PANI-EB composite displayed weak PL and decay time in the range of nanoseconds. This results from the great involvement of the surface states in nanometric powders which creates efficient channels for the non-radiative recombination of the carriers. 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 0.0 0.5 1.0 b 3.05 2.70 2.35 Energy (eV) Normalized PL intensity a PL spectra of (w)ZnS/PANI-EB under continous (a) and pulsed optical excitation (b).

An experimental and theoretical investigation on the optical and photocatalytic properties of ZnS nanoparticles

“…Intrinsic and visible emissions in ZnS NPs have been well-reported [30][31][32], and their PL properties have been explored by many researchers [9,25,[33][34][35][36], while the photocatalytic properties of ZnS NPs have been analyzed by many authors for a variety of reactions [27][28][29][37][38][39][40][41][42], however, the photocatalytic and PL behavior at nanoscale sizes remain far from well-understood.…”

Electrical characteristics of PVA-PANI-ZnS nanocomposite film synthesized by gamma irradiation method

“…* E-mail: afarin.bah@gmail.com PANI-ZnS nanocomposite is a new subject with a tremendous potential into the various applications, which makes it interesting to investigate. To the best of our knowledge, this compound has been scientifically studied in six different studies [6][7][8][9][10][11]. At present, two methods are used for the preparation of ZnS/conducting polymer composites: the dispersion of ZnS nanocrystals in polymer solution and the chemical polymerization of the monomer in the presence of ZnS nanoparticles [10].…”