Okamoto Takuya, Nakamura Takahiro, Kihara Ryo, Asahi Tsuyoshi, Sakota Kenji, Yatsuhashi Tomoyuki
Graduate School of Science, Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University 2-1-1 Katahira, Aoba-ku, Sendai, 980-857, Japan.
Chemphyschem. 2018 Oct 5;19(19):2480-2485. doi: 10.1002/cphc.201800436. Epub 2018 Jul 18.
Iron-based nanoparticles (FeNPs) have unique and attractive properties such as superparamagnetism, biocompatibility, and catalytic activity. Although the synthesis of precious metal NPs from a metal in liquid and/or metal salt solution by a pulsed laser has been investigated, comparably little effort has been devoted to examine the production of FeNPs. Here we report the synthesis of carbon-shell free spherical NPs of iron oxide (magnetite) from ferrocene hexane solution by femtosecond near infrared laser pulses. Nanosecond UV laser pulses are used to compare the evolution of the particle size distribution as a function of laser irradiation time. The size of NPs remains constant even for extended exposure to femtosecond laser pulses, whereas it grows with exposure to nanosecond laser pulses. The primary particles are generated by photochemical reactions regardless of pulse duration; however, the fragmentation of NPs by successive femtosecond laser pulses regulates the particle size.
铁基纳米颗粒（FeNPs）具有超顺磁性、生物相容性和催化活性等独特且吸引人的特性。尽管已经研究了通过脉冲激光从液体和/或金属盐溶液中的金属合成贵金属纳米颗粒，但用于研究FeNPs制备的工作相对较少。在此，我们报告了通过飞秒近红外激光脉冲从二茂铁己烷溶液中合成无碳壳的球形氧化铁（磁铁矿）纳米颗粒。使用纳秒紫外激光脉冲来比较粒径分布随激光照射时间的变化情况。即使长时间暴露于飞秒激光脉冲下，纳米颗粒的尺寸仍保持不变，而在纳秒激光脉冲照射下其尺寸会增大。无论脉冲持续时间如何，初级颗粒都是通过光化学反应产生的；然而，连续飞秒激光脉冲对纳米颗粒的碎片化作用调节了颗粒尺寸。
