Citation

Nee, Chen Hon and Yap, Seong Shan and Yap, Seong Ling and Tou, Teck Yong (2019) Femtosecond Laser Filamentation in Liquid for Nanomaterials Synthesis. In: 14th Asia Pacific Physics Conference (APPC 2019), 17-22 Nov 2019, Borneo Convention Centre Kuching (BCCK), Kuching, Malaysia.

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Abstract

Ultrafast laser open up new possibilities for nanomaterials synthesis in laser ablation process that typically involve an opaque solid target. In transparent media, nonlinear optical process occurred and led to laser filamentation [1]. Laser filament formed when an ultrashort laser pulses propagate in transparent media of gas, liquid or solid with energy exceeding the threshold. This is accompanied by the appearance of the characteristic conical emissions of white light and coloured rings and the occurrence of intensity clamping. The ultrafast laser pulses induced ‘filamentation’ where the surrounding is ionized and plasma is produced. The produced plasma may be useful for nanomaterials growth. In the current work, we investigated on the nanoparticles formed by ultrafast laser filamentation in liquid, where the liquid contain the precursor elements. We show that nanodiamonds with the size of <5 nm are formed directly from ethanol via 1025 nm femtosecond laser irradiation [2]. Ultrafast laser filamentation occurred and white light supercontinuum is detected in ethanol. In addition, emissions of C species are recorded by optical emission spectroscopy while the change in absorbance of the liquid medium is detected in-situ during ultrafast laser filamentation in ethanol [3]. The prepared samples are characterized by using Raman spectroscopy, XPS, TEM and photoluminescence measurements.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Femtosecond laser
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Engineering (FOE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	28 Jan 2022 02:13
Last Modified:	28 Jan 2022 02:13
URII:	http://shdl.mmu.edu.my/id/eprint/9553

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