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首页> 外文期刊>Chinese science bulletin >Study of formation of supercluster (CdS)_4 in zeolite hosts by in situ IR spectra
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Study of formation of supercluster (CdS)_4 in zeolite hosts by in situ IR spectra

机译：原位红外光谱研究沸石基质中CdS_4超团簇的形成

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摘要

Nanometer-sized semiconductor clusters demonstrate novel non-linear optical property and capability of storing light energy. The cluster will display quantum-confined effect if its size is less than 5 nm, i.e. the atoms sitting on the interface of clusters are different from those of intra molecule and bulk crystal. The semiconductor clusters show corresponding change in optical absorption. For example, the optical absorption of nanometer-sized CdS blue-shifts compared to the bulk CdS. Because zeolite is composed of nanometer-size pores which keep in 3-dimensional periodic arrangement, the diameter of CdS cluster formed inside zeolite cage must not be larger than the super cage (1,3 nm) or beta-cage (0.9 nm) in HY zeolite. Generally the X-iay diffraction method can no longer be used for crystal size less than 2.5 nm. EXAFS experiment can determine the bond distance among atoms, but the occupying positions of clusters of CdS in HY zeolite depend on simulated calculation. In this note, the authors suggest using the means of in situ IR to localize the cluster in cages of zeolite and observe its formation by following its synthesis procedure with both the structural hydroxy of zeolite as a probe and the knowledge of the distribution site of cation inzeolite pores.
机译：纳米级半导体簇显示出新颖的非线性光学性质和存储光能的能力。如果团簇的尺寸小于5 nm，则团簇将显示量子受限效应，即位于团簇界面上的原子与分子内和块状晶体的原子不同。半导体簇显示出相应的光吸收变化。例如，与整体CdS相比，纳米级CdS的光吸收发生蓝移。由于沸石是由纳米尺寸的孔组成，这些孔以3维周期排列，因此在沸石笼内形成的CdS团簇的直径不得大于超级笼（1.3 nm）或β笼（0.9 nm）。 HY沸石。通常，对于小于2.5 nm的晶体，不再可以使用X-iay衍射法。 EXAFS实验可以确定原子之间的键距，但是CYS簇在HY沸石中的占据位置取决于模拟计算。在本文中，作者建议使用原位红外方法将分子簇定位在沸石的笼中，并按照分子筛的结构羟基作为探针并了解阳离子分布位点，按照其合成步骤观察其形成。沸石孔隙。

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