Product Code: PIC2008_M1102

Fabrication of Nanomaterials by Laser Irradiation in Liquid Phase (Invited Paper)
Naoto Koshizaki, National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Japan
Takeshi Sasaki, National Institute of Advanced Industrial Science and Technology (Aist); Tsukuba Japan
Presented at PICALO 2008

We have been working on a nanoparticle fabrication technique by irradiating laser light onto a plate placed or powder dispersed in liquid media. This technique has several advantages over conventional nanoparticle preparation in liquid phase; highly pure nanoparticles with less use of surfactant molecules mostly toxic in biological systems, and crystallized nanoparticle formation due to the transient high-temperature process induced by pulsed laser irradiation. Thus, these features are expected to be suitable for fabricating nanoparticles for biomedical use. Here we report on B4C submicron particles preparation by pulsed laser irradiation of B particles dispersed in ethyl acetate at room temperature under atmospheric pressure and room temperature, aiming for a new type of medicine for boron neutron capture therapy. This is the first report on carbide particle preparation by pulsed laser irradiation in liquid phase, although many reports have discussed noble metal and metal oxide particle preparation by this technique. Other unique examples of nanomaterials such as patterned apatite, surfactant-free stable gold nanoparticles, etc. fabricated by laser irradiation in liquid phase are also demonstrated.

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