Excimer Laser Production, Assembly, Sintering, and Fragmentation of Novel Fullerene-like Permalloy Particles in Liquid

• Published in: Journal of physical chemistry. C Vol. 114; no. 9; pp. 3869 - 3873
• Main Authors: Yan, Zijie, Bao, Ruqiang, Huang, Yong, Caruso, A. N, Qadri, Syed B, Dinu, Cerasela Zoica, Chrisey, Douglas B
• Format: Journal Article
• Language: English
• Published: American Chemical Society 11.03.2010
• Subjects: C: Nanops and Nanostructures
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp911566a

We report the fabrication of permalloy nanoparticles by pulsed excimer laser ablation of a permalloy (Fe19Ni81) target in sodium dodecyl sulfate aqueous solution and the subsequent laser-induced assembly, sintering, and fragmentation of the nanoparticles. Specifically, permalloy nanoparticles with diameters of 400−600 nm were observed to assemble into fullerene-like hollow microparticles. Laser irradiation caused sintering of the assembled particles, which showed Wulff construction and ledge growth behavior and finally resulted in smooth shells. Laser−particle interactions also caused fragmentation of the micro/nanoparticles. When the particle concentration is high, laser fragmentation rather than laser ablation dominates due to enhanced light absorption and scattering. The experiments reveal the dynamic process of the nano- and microparticle formation, demonstrating the rich processing environment of laser ablation in liquid.