In Situ Redox Microfluidic Synthesis of Core鈥揝hell Nanoparticles and Their Long-Term Stability

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• 作者：Yujun Song ; Shaoxia Ji ; Yuan-Jun Song ; Runsheng Li ; Jie Ding ; Xiaomiao Shen ; Rongming Wang ; Riwei Xu ; Xiaoyu Gu
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：August 22, 2013
• 年：2013
• 卷：117
• 期：33
• 页码：17274-17284
• 全文大小：753K
• 年卷期：v.117,no.33(August 22, 2013)
• ISSN：1932-7455

文摘

An in situ redox process in microfluidic reactors was developed to synthesize hybrid nanoparticles with amorphous metallic cores and uniform metal oxide shells embedded with nanocrystallites at large scale. For example, the fabricated Fe(B)@iron oxides nanoparticles (NPs) exhibit permanent ferromagnetic properties at room temperature due to the strong magnetic coupling between different parts and the nanocrystalline pinning effect, providing an alternative design of nanostructures to break out the superparamagnetic limit in ultratiny particles. The NPs with amorphous metallic cores and uniform metal oxide shells can be well maintained over 4鈥? months. The dictated novel microfluidic process provides a large-scale synthetic strategy for metal@metal oxide core鈥搒hell NPs with uniform shells and long-term stability and can be extended to a variety of material systems.