Ultra-stable nanoparticles of CdSe revealed from mass spectrometry
Ultra-stable nanoparticles of CdSe revealed from mass spectrometry
复制标题
DOI：
10.1038/nmat1056
复制
发表时间：
2004-02-01
期刊：
影响因子：
41.2
通讯作者：
Kawazoe, Y
中科院分区：
文献类型：
--
作者：
Kasuya, A;Sivamohan, R;Kawazoe, Y
几纳米大小的纳米颗粒由于其独特的几何形状和强量子约束，其结构和材料功能与体块不同。这些品质可能会导致独特的设备应用。我们对CdSe纳米粒子的质谱分析表明，（CdSe）（33）和（CdSe）（34）非常稳定：用简单的溶液方法，它们比任何其他化学成分都更容易生长，从而产生宏观数量。第一性原理计算预测，这些是皱巴巴的（CdSe）（28）笼，具有基于富勒烯高度对称的八面体类似物的四元和六元环，可容纳（CdSe）(5)或（CdSe）(6)在内部形成一个本质上具有异极性sp(3)键的三维网络。这与我们的x光和光学分析一致。我们已经在CdS、CdTe、ZnS和ZnSe中发现了类似的质谱和原子结构，这表明质量指定和宏观生产的纳米颗粒，迄今为止实际上仅限于元素碳(1)，现在可以扩展到各种各样的化合物体系。
Nanoparticles under a few nanometres in size have structures and material functions that differ from the bulk because of their distinct geometrical shapes and strong quantum confinement. These qualities could lead to unique device applications. Our mass spectral analysis of CdSe nanoparticles reveals that (CdSe)(33) and (CdSe)(34) are extremely stable: with a simple solution method, they grow in preference to any other chemical compositions to produce macroscopic quantities. First-principles calculations predict that these are puckered (CdSe)(28)-cages, with four- and six-membered rings based on the highly symmetric octahedral analogues of fullerenes, accommodating either (CdSe)(5) or (CdSe)(6) inside to form a three-dimensional network with essentially heteropolar sp(3)-bonding. This is in accordance with our X-ray and optical analyses. We have found similar mass spectra and atomic structures in CdS, CdTe, ZnS and ZnSe, demonstrating that mass-specified and macroscopically produced nanoparticles, which have been practically limited so far to elemental carbon(1), can now be extended to a vast variety of compound systems.