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As depicted in Fig. 3a, the PXRD patterns of the ground powders were similar to the simulated XRD from single crystals, except for a diffuse,broad halo ranging from 17°to 25°. After vapour treatment, the broad peak disappeared. The results showed that the partially amorphous phase and crystalline phase co-existed in the ground powder. Thus, the stimuli-responsive behaviour may be attributed to the transformation of the crystalline phase to the partial amorphous phase. For the drop-casting film and Melted-m with high ΦPL, the signals of PXRD were rather weak, suggesting disordered molecular packing (Fig. 3b). Obvious reflection peaks were observed upon heating (Film-h and Melted-h). The samples became crystalline with rather low FPL. Clearly, the metastable amorphous state was crucial to the fluorescence intensity of the luminogens. |
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团子小姐: 金币+7, 翻译EPI+1, ★★★★★最佳答案, 谢谢 2014-10-15 19:45:25
团子小姐: 金币+7, 翻译EPI+1, ★★★★★最佳答案, 谢谢 2014-10-15 19:45:25
| 如图3a所示，研磨粉末的PXRD图谱与单结晶的模拟X射线衍射是相似的，除了其弥漫、宽晕的范围（从17°到25°）。经过蒸汽处理，宽峰消失了。该结果表明，在研磨粉末中，部分非晶相和结晶相是共同存在的。因此，刺激响应性能可以归因于由结晶相向部分非晶相的转变。对于下拉式浇铸薄膜和具有高ΦPL的Melted-m，PXRD的信号是相当弱的，表明其无序的分子堆积（图3b）。在加热时（Film-h和Melted-h）出现明显的反射峰。样品具有很低FPL的结晶。显然，亚稳态的非晶状态对荧光原的荧光强度是至关重要的。 |
2楼2014-10-15 02:45:13