期刊
NANOTECHNOLOGY
卷 26, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0957-4484/26/6/065601
关键词
laser ablation in liquids; bare Au nanoparticles; femtosecond laser fragmentation
资金
- French National Research Agency (ANR) [ANR-10-BLAN-919]
- A*MIDEX project [ANR-11-IDEX-0001-02]
- 'Plan Cancer' of the French Institute of Health and Medical Research (INSERM)
We report a size-controllable synthesis of stable aqueous solutions of ultrapure low-size-dispersed Au nanoparticles by methods of femtosecond laser fragmentation from preliminary formed colloids. Such approach makes possible the tuning of mean nanoparticle size between a few nm and several tens of nm under the size dispersion lower than 70% by varying the fluence of pumping radiation during the fragmentation procedure. The efficient size control is explained by 3D geometry of laser fragmentation by femtosecond laser-induced white light super-continuum and plasma-related phenomena. Despite the absence of any protective ligands, the nanoparticle solutions demonstrate exceptional stability due to electric repulsion effect associated with strong negative charging of formed nanoparticles. Stable aqueous solutions of bare gold nanoparticles present a unique object with a variety of potential applications in catalysis, surface-enhanced Raman spectroscopy, photovoltaics, biosensing and biomedicine.
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