This paper reviews recent developments in the preparation, surface functionalization, and applications of Fe3O4 magnetic nanoparticles. Especially, it includes preparation methods (such as electrodeposition, polyol methods, etc.), organic materials (such as polymers, small molecules, surfactants, biomolecules, etc.) or inorganic materials (such as silica, metals, and metal oxidation/sulfide, functionalized coating of carbon surface, graphene, etc.) and its applications (such as magnetic separation, protein fixation, magnetic catalyst, environmental treatment, medical research, etc.). In the end, some existing challenges and possible future trends in the field were discussed.

中文翻译：

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Fe3O4磁性纳米粒子的制备，表面功能化及应用。

本文概述了Fe3O4磁性纳米粒子的制备，表面功能化和应用方面的最新进展。特别是，它包括制备方法（例如电沉积，多元醇方法等），有机材料（例如聚合物，小分子，表面活性剂，生物分子等）或无机材料（例如二氧化硅，金属和金属氧化/硫化物） ，碳表面，石墨烯等的功能化涂层及其应用（例如磁分离，蛋白质固定，磁催化剂，环境处理，医学研究等）。最后，讨论了该领域中一些现有的挑战和可能的未来趋势。