Size and surface effects of Prussian blue nanoparticles protected by organic polymers
Size and surface effects of Prussian blue nanoparticles protected by organic polymers
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DOI：
10.1021/ic0488435
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发表时间：
2004-11-15
影响因子：
4.6
通讯作者：
Kitagawa, S
中科院分区：
文献类型：
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作者：
Uemura, T;Ohba, M;Kitagawa, S
以聚乙烯吡咯烷酮（PVP）和聚二甲基二烯丙基氯化铵（PDDA）为有机高分子，制备了普鲁士蓝（PB）纳米粒子。不同的实验条件（Fe离子的浓度和Fe的进料比的聚合物）进行了研究，以控制PB纳米粒子的大小。例如，通过在不同条件下使用PVP，PB纳米颗粒的平均尺寸从12 nm调谐到27 nm。PDDA的加入通过有效的静电相互作用产生具有非常小的尺寸（5-8 nm）的PB纳米颗粒。我们发现PB纳米粒子的表面环境影响PB的固有性质。PB纳米粒子中的电荷转移（CT）吸收峰由Fe 2+向Fe 3+移动是由表面保护聚合物引起的。特别是，具有PVP保护的PB纳米粒子在各种有机溶剂中显示出高溶解度和溶剂依赖性CT吸收。PB纳米粒子的磁性测量显示出前所未有的尺寸依赖性，表面效应和超顺磁性。
Prussian blue (PB) nanoparticles protected by organic polymers such as poly(vinylpyrrolidone) (PVP) and poly(diallyldimethylammonium chloride) (PDDA) were prepared. Different experimental conditions (concentrations of Fe ions and feed ratios of Fe to the polymers) have been investigated to control the size of the PB nanoparticles. For example, the averaged dimensions of the PB nanoparticles were tuned from 12 to 27 nm by use of PVP in the different conditions. Addition of PDDA produced the PB nanoparticles with very small dimensions (5-8 nm) by an effective electrostatic interaction. We found that the surface environments of the PB nanoparticles affect the inherent properties of PB. The shifts of charge transfer (CT) absorptions from Fe2+ to Fe3+ in the PB nanoparticles resulted from the surface-protecting polymers. Especially, the PB nanoparticles with the PVP protection show high solubility in a variety of organic solvents and a solvent-dependent CT absorption. Measurement of the magnetic properties of the PB nanoparticles showed unprecedented size-dependency, surface effect, and superparamagnetic properties.