普鲁士蓝
结晶度
结晶
纳米颗粒
成核
无定形固体
材料科学
纳米技术
化学工程
化学物理
结晶学
化学
有机化学
复合材料
电极
物理化学
电化学
工程类
作者
Kaizheng Feng,Jing Zhang,Haijiao Dong,Zhuoxuan Li,Ning Gu,Ming Ma,Yu Zhang
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2021-04-21
卷期号:4 (5): 5176-5186
被引量:26
标识
DOI:10.1021/acsanm.1c00617
摘要
Controllable synthesis of Prussian blue nanoparticles (PBNPs) is significant for their various applications. Further, exploration on the growth process of PBNPs (a kind of nanoparticle which usually undergoes an extremely complicated formation process) is instructive for controllable synthesis and will be an important supplement for crystallization theory. Herein, we developed a facile method to precisely and widely control the size and crystallinity of PBNPs. By simply tuning the prior addition volume of ferric chloride and citric acid mixture combining a double injection reaction, particles with a hydrodynamic size ranging from 120 to 40 nm were synthesized. Meanwhile, the crystallinity of the particles reduced as their size decreased. Unlike the common cognition that generation of PBNPs undergoes a nonclassical aggregation process, our results demonstrated that reaction rate dominated classical nucleation and nuclei enlargement, and the subsequent crystallization contributed to the formation of PBNPs. By carefully studying the crystallography state and transformation relationship of the as-prepared particles, PBNPs were generally divided into three categories: highly crystalline, partly crystalline, and highly amorphous PBNPs. Spectroscopy, enzymology, and magnetic measurements confirmed the size- and crystallinity-dependent physicochemical properties of the PBNPs. Smaller and amorphous PBNPs exhibited remarkably stronger peroxidase-like activity, catalase-like activity, and T1-weighted magnetic resonance imaging (MRI) ability, suggesting their great potential in the application of multienzyme catalysis and MRI.
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