Effect of polyvinyl alcohol concentration on the ZnS nanoparticles and wet chemical synthesis of wurtzite ZnS nanoparticles

Abstract

The new nanocrystalline composition was synthesized using NiSO 4 and MoO 3 and PPDA (p-phenylenediamine) via the hydrothermal method. The structure, morphology and photoluminescence property of nanocrystal were studied using X-ray diffraction (XRD), Fourier transform infra red (FT-IR) spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) spectra, thermogravimetric analysis (TGA-DTA) and energy-dispersive X-ray spectroscopy (EDX). The effect of factors such as type and concentration of initial materials, pH values, temperature and reaction duration on the structure and morphology of nanocrystals was investigated in the preparation of composition. The results show that the pH of the initial solution affects the size of the prepared nanocrystals; the size of the crystals is increased and the morphology of the nanostructures is changed with the increment in pH value. According to the obtained results, neutral or low alkaline conditions of pH are more favorable for the formation of the nanocrystals. The obtained nanocrystal shows an intense PL emission at room temperature with a maximum peak at 461 nm and excitation at the wavelength of 300 nm. TGA and DTA analysis display a total weight loss of 13.42%.

Richardson-Schottky transport mechanism in ZnS nanoparticles

“…For synthesis of cubic ZnS nanoparticles, there exist several techniques such as solvo thermal method, hydrothermal method, solid state reaction method, sol-gel processing and chemical co-precipitation method. 14,[26][27][28][29] In this research work, the wurtzite ZnS nanoparticles have been synthesized chemically by co-precipitation method followed by the annealing process. Temperature dependent I-V characteristics over the temperature range of 300 to 400 K have been performed.…”

The photoluminescence enhancement of Mn2+ ions and the crystal field in ZnS:Mn nanoparticles covered by polyvinyl alcohol

“…This result shows the bonds between OH group of PVA and ZnS:Mn nanoparticles. The appearances of peaks of CH group at 1544 and 1419 cm -1 in FT-IR spectra of ZnS:Mn/PVA nanoparticles are the result of coordinate bonding between PVA and Zn(Thottoli and Achuthanunni 2013).The analyzed results of the XRD patterns, TGA, DTG, FT-IR spectra of ZnS:Mn/PVA nanoparticles proved that the PVA capping agent unchanged the phase of ZnS:Mn nanoparticles. The embedment of ZnS:Mn nanoparticles into PVA matrix caused the decrease of the intermolecular hydrogen bonding between PVA chains, simultaneous their has reduced due to un-aggregation of ZnS:Mn nanoparticles.…”

Enhanced photoelectrical conductivity of poly (3-hexylthiophene) by incorporation of ZnS nanoparticles

“…2b) sample. These images indicate the presence of spherical agglomerates consisting of individual nanoparticles, that are approximately in the range of 10-20 nm in size [34,35]. Fig.…”