A technique to increase nanosecond laser based production of ferric nanoparticles by elevating temperature of the iron target and controlling its surface exposure to oxygen is reported. High power near-infrared laser ablation of the iron target heated up to 600 °C enhances the particle generation efficiency by more than tenfold exceeding 6 μg/J. Temporal and thermal dependencies of the particle generation process indicate correlation of this enhancement with the oxidative processes that take place on the iron surface during the per spot interpulse delay. Nanoparticles, produced using the heat-assisted ablation technique, are examined using scanning electron and transmission electron microscopy confirming the presence of 1–100 nm nanoparticles with an exponential size distribution that contain multiple randomly oriented magnetite nanocrystallites. The described process enables the application of high power lasers and facilitates precise, uniform, and controllable direct deposition of ferric nanoparticle co...

中文翻译：

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热辅助纳秒激光生成三价铁纳米粒子

报道了一种通过提高铁靶的温度并控制其表面暴露于氧气来增加基于纳秒激光的三价铁纳米颗粒生产的技术。加热至 600 °C 的铁靶的高功率近红外激光烧蚀将粒子生成效率提高了十倍以上，超过 6 μg/J。粒子生成过程的时间和热相关性表明这种增强与每点脉冲间延迟期间发生在铁表面的氧化过程的相关性。使用热辅助烧蚀技术生产的纳米颗粒使用扫描电子显微镜和透射电子显微镜进行检查，确认存在具有指数尺寸分布的 1-100 nm 纳米颗粒，其中包含多个随机取向的磁铁矿纳米微晶。