Preparation of Organic Dye Nanoparticles by Nanosecond Laser Ablation in a Poor Solvent

Microcrystalline powder of several dye compounds suspended in a poor solvent was converted into their nanoparticle dispersion by irradiating with the third harmonics of nanosecond Nd3+: YAG laser (355 nm, 7 ns, 10 Hz). The colored colloidal solutions were stable during more than 1 week without any s...

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Bibliographic Details
Published inRēzā kenkyū Vol. 33; no. 1; pp. 41 - 46
Main Authors ASAHI, Tsuyoshi, YUYAMA, Kenichi, SUGIYAMA, Teruki, MASUHARA, Hiroshi
Format Journal Article
LanguageEnglish
Published Suita The Laser Society of Japan 01.01.2005
Laser Society of Japan
Subjects
Colloidal solution
Dye molecule
Nanosecond laser ablation
Organic nanoparticle
Pigment
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Summary:Microcrystalline powder of several dye compounds suspended in a poor solvent was converted into their nanoparticle dispersion by irradiating with the third harmonics of nanosecond Nd3+: YAG laser (355 nm, 7 ns, 10 Hz). The colored colloidal solutions were stable during more than 1 week without any surfactants. Dye nanoparticles with the mean size of about 50 nm were confirmed by SEM observation, and the mean size was almost the same for all compounds. The nanoparticle formation was analyzed by visible absorption measurement. The laser fluence dependence demonstrates that laser ablation of microcrystals is considered to be responsible to nanoaparticle formation. The mechanism is discussed in terms of the urtrafast photo-thermal conversion process and the subsequent fragmentation of microcrystal.
ISSN:0387-0200
1349-6603
DOI:10.2184/lsj.33.41