Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Nanotechnology. 2010 Apr 9;21(14):145609. doi: 10.1088/0957-4484/21/14/145609. Epub 2010 Mar 16.
Micro/nanoparticles were fabricated by pulsed-excimer-laser ablation of a Pt target in water. Three kinds of hollow Pt particles (coalesced by micrograins, assembled by nanocrystals or with smooth shells) were observed together with solid particles using different laser fluences (2.3-6.8 J cm(-2)) and after 6000 laser shots. We propose that the hollow particles were formed on laser-produced bubbles which provided thermodynamically preferred nucleation sites and diffusion sinks for the laser-fabricated Pt clusters or particles. Although the hollow particles are a small proportion, the results have extended the scope of particles that pulsed-laser ablation in liquid can fabricate, and have enriched the mechanistic scenario of laser ablation and nanostructure formation in liquid.
采用脉冲准分子激光烧蚀 Pt 靶的方法在水中制备了纳米/微米颗粒。使用不同的激光能量密度（2.3-6.8 J/cm²）和 6000 次激光辐照后，观察到了三种不同的 Pt 空心颗粒（由微晶粒聚结、由纳米晶体组装或具有光滑外壳）以及实心颗粒。我们提出，空心颗粒是在激光产生的气泡上形成的，这些气泡为激光制备的 Pt 团簇或颗粒提供了热力学上有利的成核位置和扩散阱。尽管空心颗粒的比例很小，但这些结果扩展了液体中脉冲激光烧蚀可以制备的颗粒范围，并丰富了液体中激光烧蚀和纳米结构形成的机制情景。
