Citation

Nee, Chen Hon and Yap, Seong Ling and Tou, Teck Yong and Chang, Huan Cheng and Yap, Seong Shan (2016) Direct synthesis of nanodiamonds by femtosecond laser irradiation of ethanol. Scientific Reports, 6. p. 33966. ISSN 2045-2322

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Abstract

Carbon nanomaterials exhibit novel characteristics including enhanced thermal, electrical, mechanical, and biological properties. Nanodiamonds; first discovered in meteorites are found to be biocompatible, non-toxic and have distinct optical properties. Here we show that nanodiamonds with the size of <5?nm are formed directly from ethanol via 1025?nm femtosecond laser irradiation. The absorption of laser energy by ethanol increased non-linearly above 100??J accompanied by a white light continuum arises from fs laser filamentation. At laser energy higher than 300??J, emission spectra of C, O and H in the plasma were detected, indicating the dissociation of C2H5OH. Nucleation of the carbon species in the confined plasma within the laser filaments leads to the formation of nanodiamonds. The energy dependence and the roles of the nonlinear phenomenon to the formation of homogeneous nanodiamonds are discussed. This work brings new possibility for bottom-up nanomaterials synthesis based on nano and ultrafast laser physics.

Item Type:	Article
Uncontrolled Keywords:	Chemical physics, Nanoparticles, Nonlinear optics, Synthesis and processing
Subjects:	Q Science > QC Physics > QC350-467 Optics. Light
Divisions:	Faculty of Engineering (FOE)
Depositing User:	Ms Suzilawati Abu Samah
Date Deposited:	22 May 2018 11:50
Last Modified:	22 May 2018 11:53
URII:	http://shdl.mmu.edu.my/id/eprint/6695

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