College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, People's Republic of China.
Nanotechnology. 2017 Aug 25;28(34):345601. doi: 10.1088/1361-6528/aa7b9c. Epub 2017 Jun 26.
Herein, we report an efficient and universal strategy for synthesizing a unique triple-shell structured FeO@SiO@C-Ni hybrid composite. Firstly, the FeO cores were synthesized by hydrothermal reaction, and sequentially coated with SiO and a thin layer of nickel-ion-doped resin-formaldehyde (RF-Ni) using an extended Stöber method. This was followed by carbonization to produce the FeO@SiO@C-Ni nanocomposites with metallic nickel nanoparticles embedded in an RF-derived thin graphic carbon layer. Interestingly, the thin SiO spacer layer between RF-Ni and FeO plays a critical role on adjusting the size and density of the nickel nanoparticles on the surface of FeO@SiO nanospheres. The detailed tailoring mechanism is explicitly discussed, and it is shown that the iron oxide core can react with the nickel nanoparticles without the SiO spacer layer, and the size and density of the nickel nanoparticles can be effectively controlled when the SiO layer exits. The multifunctional composites exhibit a significantly enhanced catalytic performance in the reduction of 4-nitrophenol (4-NP).
在此，我们报告了一种高效通用的策略，用于合成独特的三层结构 FeO@SiO@C-Ni 杂化复合材料。首先，通过水热反应合成了 FeO 核，然后使用扩展的 Stöber 法依次涂覆有 SiO 和薄层的镍离子掺杂的树脂-甲醛（RF-Ni）。接着进行碳化，在 RF 衍生的薄图形碳层中嵌入了金属镍纳米粒子，从而生成了 FeO@SiO@C-Ni 纳米复合材料。有趣的是，RF-Ni 和 FeO 之间的薄 SiO 间隔层在调节 FeO@SiO 纳米球表面上镍纳米粒子的尺寸和密度方面起着关键作用。明确讨论了详细的调整机制，并表明当存在 SiO 层时，氧化铁芯可以与镍纳米粒子反应，而无需 SiO 间隔层，并且可以有效控制镍纳米粒子的尺寸和密度。多功能复合材料在还原 4-硝基苯酚（4-NP）方面表现出显著增强的催化性能。
