Fabrication of oxidation-resistant Ge colloidal nanoparticles by pulsed laser ablation in aqueous HCl
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Spherical Ge nanoparticles with diameters of 20–80 nm were fabricated by laser ablation of a Ge single crystal in water and in aqueous HCl using sub-picosecond laser pulses (1040 nm, 700 fs, 100 kHz, and a pulse energy of 10 µJ). We found that the as-synthesized nanoparticles suffered rapid oxidization followed by dissolution when laser ablation was conducted in pure water. In contrast, oxidation of Ge nanoparticles produced in dilute HCl and stored intact was minimal, and colloidal dispersions of the Ge nanoparticles remained stable up to 7 days. It was elucidated that dangling bonds on the surfaces of the Ge nanoparticles were terminated by Cl, which inhibited oxidation, and that such hydrophilic surfaces might improve the dispersibility of nanoparticles in aqueous solvent.
KeywordsLaser Ablation GeO2 Colloidal Suspension Pulse Laser Ablation Repulsion Potential
The authors would like to thank Dr. Satoshi Fujita, Aisin Seiki Co. Ltd., and IMRA America, Inc. for allowing the use of the femtosecond laser and helpful technical support.
Compliance with ethical standards
This study received no funding.
Conflict of interest
The authors declare that they have no conflict of interest.
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