用原子力显微镜实时观测了有机晶体CMTD(CdHg(SCN)4(H6C2OS)2)的表面分解过程,这一分解过程是以表面形貌变化来表征的,并且能反映分解过程中的一些固态反应的物理一化学变化机制.X射线能谱分析(EDAX)表明,相对于新鲜的CMTD晶体,在分解物中Hg低而S高;X射线衍射(XRD)表明分解物为非晶态;红外吸收光谱(IR)表明在CMTD晶体结构中的(H6C2OS)结构基元被分解为H2O和酸;量热分析(DSC)表明CMTD晶体在室温空气中确实有化学反应发生.本文用原子力显微镜实时记录了这一分解过程的形貌变化,发现这种非晶态的分解物的产生过程为:成核一核生长一核分散等.这是首次用原子力显微镜实时观测到这种分解过程.
The decomposition processes of CMTD ( CdHg(SCN)4(H6C2OS)2 ) crystal surface were investigated by AFM ( atomic force microscopy). These processes are characterized by the morphological changes of the surface and reflect some physic-chemical mechanism of the solid-state reaction. EDAX ( energy dispersion analyzer of X-ray) shows that Hg is poorer but S is richer in the decomposition products than in fresh CMTD crystals. XRD (X-ray diffraction)data reflect that the decomposition products are non-crystalline. IR ( infrared ray absorbed spectra) analysis shows that during the decomposition processes (H6C2OS)units were decomposed into H2O and acid. DSC (differential scanning calorimeter)analysis shows that CMTD crystals have chemical reactions in air at room temperature. AFM observations show that the formation processes of the non-crystalline decomposition products include nucleation, nuclei growth, nuclei dispersion, etc. It is the first time to directly observe this kind of decomposition processes by AFM.
参考文献
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