Impact of Laser Pulse Variation on the Structural, Morphological, and Optical Properties of Gold Oxide Nanoparticles Synthesized via Laser Ablation Technique

Abstract

Gold oxide nanoparticles are most useful in various applications due to their distinctive properties. they have valuable photocatalytic, antimicrobial, and optical properties, which makes them very important in antibacterial coatings, sensors, and energy storage applications. This study used the laser ablation technique to synthesize the gold oxide nanoparticles in 2-methoxyethanol. The ablation process was done using a Q-switched Nd:YAG laser with a wavelength of 1064 nm, and different pulses of 500, 1000, 1500, 2000, and 2500 pulses to irradiate the gold target. Various techniques have been used to character the resulting gold oxide nanoparticles, such as FT-IR, to investigate the active groups and bonding patterns. The obtained outcomes noted an interplay between the ablated gold nanoparticles and the surrounding medium. Furthermore, the morphology of prepared nanoparticles was characterized by the use of  (AFM), which evaluated that the grain size reduced from 46.7 nm at 500 pulses to be38.3 nm at 2500 pulses. The look also investigated the optical properties by measuring the absorption spectrum at a range of 300-800nm. The energy gap of the acquired colloidal changed into calculated. The effects showed that the energy gap decreased from 2.73 eV at 500 pulses with an increasing number of pulses to 1.34 eV at 2500 pulses.