Characterization of Vibrational Modes and Absorbance Properties of MoOₓ Nanoparticle Colloids Synthesized by Laser Ablation in Distilled Water Using FTIR and UV-Vis Spectroscopy

Tri Astuti Ramadhani Mbaako, Ali Khumaeni, Pandji Triadyaksa

Abstract


This study reports the synthesis of molybdenum oxide (MoOx) nanoparticles by pulsed laser ablation of solids in liquids (PLAL) using a Nd:YAG laser (1064 nm, 80 mJ, 7 ns pulse width, and 10 Hz repetition rate) and distilled water as the liquid medium. A 99.95% molybdenum metal target was ablated for 1.5 hours with an alternating cycle of 10 min ablation and 10 min rest. The synthesized colloids were characterized by Fourier Transform Infrared Spectroscopy (FTIR) and UV-Visible (UV-Vis) spectroscopy. The FTIR results confirmed the formation of vibrational modes corresponding to terminal Mo=O, bridging Mo-O-Mo bending, which are characteristic of the molybdenum oxide phases. The UV–Vis spectrum exhibited a strong absorption band at 299 nm, which can be attributed the ligand-to-metal charge transfer (LMCT) in the molybdenum oxide nanostructures. The influence of the distelled water medium on the synthesis process, colloidal stability and optical properties is discussed in detail along with the temporal changes observed in the colloid.

Keywords


Pulsed Laser Ablation; Molybdenum Nanoparticles; Distilled Water.

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DOI: http://dx.doi.org/10.52155/ijpsat.v58.1.8259

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