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Nguyen, The Binh Nguyen, Dinh Thanh Nguyen, Quang Dong Nguyen, Thi Trinh Using Nd:YAG laser we studied to produce platinum nanoparticles (PtNPs) in solution of polyvinyl pyrrolidone (C6H9NO)n (PVP) by laser ablation method. The influence of average laser power, laser irradiation time, laser wave length and concentration of PVP solution in water on morphology, size distribution of PtNPs was investigated. The mean diameter of the PtNPs in 0.01M PVP solution was of 9 nm. The results on an optimum laser ablation process for preparation of PtNPs in PVP solution were discussed in this paper. Chi tiết xin mời tham khảo tại http://repository.vnu.edu.vn/handle/VNU_123/56061   Title:  Preparation of Platinum Nanoparticles in Solution of Polyvinyl Pyrrolydone (PVP) by Laser Ablation Method Authors:  Nguyen, The Binh Nguyen, Dinh Thanh Nguyen, Quang Dong Nguyen, Thi Trinh Keywords:  Laser ablation;plasmon resonance;nanoparticle;second harmonic Issue Date: ...

Yoshio Kobayashi Yusuke Yasuda Toshiaki Morita This review introduces our study on the development of Cu-based nanoparticles suitable as fillers in the metal-metal bonding process. Colloid solutions of various nanoparticles such as cuprous iodide, cupric oxide (CuO), CuO mixed with silver oxide (Ag2O/CuO), cuprous-oxide (Cu2O), metallic Cu, plolypyrrole-coated metallic Cu, and metallic Cu containing metallic Ag (Ag/Cu) were prepared by liquid phase processes such as reduction and a salt-base reaction. Metal-metal bonding properties of their powders were evaluated by sandwiching the particle powder between metallic discs, annealing them at a pressure of 1.2 MPa, and measuring the shear strength required for separating the bonded discs. Various particles (above-mentioned), various metallic discs (Cu, Ag, and Ni), various bonding temperatures (250-400 C), and different atmospheres in bonding (H2 and N2) were examined to find nanoparticle filler suitable for metal-metal bond...