Size- and shape-controlled synthesis of Prussian Blue nanoparticles by a polyvinylpyrrolidone-assisted crystallization process
Size- and shape-controlled synthesis of Prussian Blue nanoparticles by a polyvinylpyrrolidone-assisted crystallization process
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DOI：
10.1039/c2ce25040c
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发表时间：
2012-01-01
期刊：
影响因子：
3.1
通讯作者：
Yamauchi, Yusuke
中科院分区：
文献类型：
--
作者：
Ming, Hu;Torad, Nagy L. K.;Yamauchi, Yusuke
配位聚合物纳米粒子的制备因其具有增大比表面积的优点而成为目前研究的热点。本文报道了一种制备不同粒径普鲁士蓝（PB）纳米粒子的简便方法。它们的颗粒大小从几十纳米到亚微米不等，取决于合成条件。所得颗粒可分为三类：小（约20 nm）、中等尺寸（约100 nm）和大（超过200 nm）。中等尺寸和大颗粒通过精细纳米颗粒的定向聚集形成，显示出介晶构象（即，伪单晶性质）。研究结果表明，该体系的结晶过程主要为非经典结晶，这将有助于进一步控制和理解其他配位聚合物的结晶过程。通过N2气体吸附-脱附测量，表征了三种不同粒径的典型样品的纳米孔隙率和比表面积。在这些样品中，中等尺寸的PB颗粒显示出最高的表面积260 m（2）g（-1），而大的PB颗粒显示出非常差的孔隙率。结果表明，配位聚合物的吸气量可以通过粒径和形状进行调节。
The preparation of coordination polymer nanoparticles is currently the focus of research attention because of the advantage of increasing the specific surface area. In this paper, we report a facile method to prepare Prussian Blue (PB) nanoparticles with different particle sizes. Their particle sizes have a wide range from a few dozen nanometres to a submicrometre, depending on the synthetic conditions. The obtained particles can be divided into three categories: small (around 20 nm), medium-sized (around 100 nm), and large (in excess of 200 nm). The medium-sized and large particles are formed by oriented aggregation of fine nanoparticles, showing a mesocrystal conformation (i.e., pseudo-single crystal nature). Our results strongly suggested that non-classical crystallization dominates the present system, which can help to further control and understand the crystallization process of other coordination polymers. By means of N-2 gas adsorption-desorption measurements, the nanoporosity and specific surface areas for typical samples with three different particle sizes are characterized. Among these samples, medium-sized PB particles show the highest surface area of 260 m(2) g(-1), while large PB particles exhibit very poor porosity. The results show that the gas uptakes of coordination polymers can be adjusted by the particle size and shape.