Effect of laser fluence on structural transformations and photoluminescence quenching of Zinc Selenide nanoparticles thin films

Abstract

Abstract
 We reported in this work the growth of ZnSe nanoparticles thin films deposited on glass substrates were synthesized by a pulsed laser deposition (PLD) method. The as obtained films were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), UV-VIS Spectrophotometer, and Photoluminescence (PL) spectra. X-ray diffraction study confirmed the transformation the cubic phase of ZnSe nanoparticles into hexagonal phase by increase the laser fluence from (4.77-5.97) J/cm2. The particle size variations were achieved by varying the laser fluence of prepared films. XRD studies and TEM images confirmed the nanometer size was found to lie in the range of 12-80 nm. A UV-VIS study was carried out to measure the band gap of the ZnSe nanoparicles thin films and it showed a blue shift with respect to the bulk value. The PL spectra at room temperature (300K) of the films showed the decrease of maximum values at at 522 nm( 2.379), 521 nm (2.3838) and 520 nm (2.3882 eV) for the laser fluence (4.77, 5.57 and 5.97 J/cm2), respectively. We assigned the variation due a larger number of non-radiative recombination centers appears in the films.

Cold plasma synthesis of Zinc Selenide Nanoparticles for inhibition bacteria using disc diffusion

“…As the lowest inhibition of all E. coli species was at a concentration of 12.5%, which is 9 mm for ZnSe NPs. As for S. aureus bacteria, the lowest inhibition diameter was recorded at the same concentration, which is 8mm with respect to ZnSe NPs, as shown in the table (4), Figures (7A) and (7C) and (8).…”

“…Different techniques of preparation include soft chemicals, chemical precipitation, soil gel method, cold plasma [5,6].In the areas of generation of ozone, surface modifications, air/water purification, medical facilities and so on, plasma technology is being marketed and industrialised, with promising energy effects and economic advantages already demonstrated. Nanomaterial synthesis is extensively carried out by techniques that do not relate to plasma, such as chemical vapour deposition (CVD) [7], solvothermal pathways, sol-gel methods, laser removal [8], etc. Fine-quality products might be produced if nonplasma techniques were appropriately selected and regulated for beginning materials and procedures.…”

Tuning Structural and Optical Properties of WO3 NPs Thin Films by the Fluency of Laser Pulses

“…SEM images show a clear effect of increasing the laser fluencies in the range 5.175, 5.573, 5.97 and 6.369 J/cm 2 on the prepared films through the interspaces between the nanoparticles, as shown in Figure 4. The increased laser fluencies provide sufficient heat for the particles to cause them to coalesce and aggregate, thus reducing the interfacial distances between them [41]. It is also evident from the SEM images that the particle size of WO3 NPs decreased and increased as 37.96, 34.5, 67.26, and 87.9 nm with the increase in the laser fluency of 5.175, 5.573, 5.97, and 6.369, respectively, as shown in Figure 4, a; b; c; and d.…”

“…In addition, the fluencies of high laser energies improve the coalescence process of neighboring atoms in the crystal [41].…”

The Improvement of Structural and Optical Properties of WO3 Nanoparticles by Regulation Substrate-Target Distance in Pulsed Laser Deposition Technique

“…Amongst those methods, the pulse laser deposition technique has been considered largely for the growth of device quality films, and is promising in preparing WO3 films over the classical deposition methods due to its several advantages, including low deposition temperature, good adhesion to the substrate, reproducibility and controllability of stoichiometry and crystal structure, and the easy deposition of alloys and compounds of materials with different vapor pressures. The microstructure, composition, morphology and physical properties of the several material films deposited by PLD strongly depending on the synthesis process and the deposition conditions, e.g., substrate temperature and power density [15,16]. Precisely stoichiometric tungsten oxide thin films have been synthesized utilizing pulsed laser deposition in a few published papers [17,18].…”