Effect of the Number Shots of Laser on Structural Transformations and Optical Properties of ZnS Nanoparticles Thin Films

Abstract

Effects of the number of shots of laser and annealing temperature on the structural, morphological, and optical properties of zinc sulfide nanoparticles (ZnS NPs) thin films, prepared by pulsed laser deposition technique (PLD), were investigated. XRD results show that ZnS NPs exhibit a hexagonal phase at 623k. Transformation in the shape of nanoparticles to nanoflowers and nanorods appeared with increasing number of shots of laser at the same annealing temperature (623K) was observed from scanning electron microscopy (SEM) images. The optical properties were studied from all transmittance data. The experimental results show that the as-deposited ZnS NPs film exhibit a cubic structure and the crystallinity increased in the annealed films. It is also found that the grain size of the as grown samples at 300K, rises linearly from 9 to 11 nm with increasing the number of shots from 1000 to 3000 and rapidly from 10 to 18 nm after annealing at 623K. Additionally, the increase of the number of shots from 1000 to 3000 leads to a decrease in the energy gap values and increases their values after heat treatment keeping their behavior decreasing as the number of shots of laser increases. Also, photoluminescence (PL) measurements explained quenching its value after annealing temperature.

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

“…The repetition rate was 5Hz, and it took place at a 45o angle on the pellet surface. Under low pressure (1×10 -3 mbar) and oxygen (1mbar), the spacing between substrate and WO3 pellet is 1.5 cm [38], as seen in Figure 1.…”

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

“…The target and substrate were rotated at (10 and 6 rpm) respectively, by using a DC motor to avoid the drilling effect. The chamber of substrate and target holder evacuated to 1*10 -3 mbar and to 1 mbar by exposing oxygen gas [19], as shown in Figure 1.…”