Reversible and hierarchical composite gels with CdSe nanocrystals.
Reversible and hierarchical composite gels with CdSe nanocrystals.
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DOI：
10.1166/jnn.2008.001
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发表时间：
2008
影响因子：
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通讯作者：
Pengchong Xue;H. Nomoto;Naokazu Ueki;M. Takafuji;H. Ihara
中科院分区：
文献类型：
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作者：
Pengchong Xue;H. Nomoto;Naokazu Ueki;M. Takafuji;H. Ihara
描述了通过一种简单的一步法合成金属盐和CdSe纳米晶的复合固体材料。这些固体可以在一些有机溶剂中形成稳定的凝胶，例如苯、环己烷和1-丁醇，特别是在正癸烷中，甚至低于0.1wt/vol.%。此外，这些凝胶呈现出强烈的荧光，可以通过凝胶浓度轻松调节。复合凝胶的温度依赖性荧光光谱表明，CdSe NCs 在凝胶状态下聚集在一起，这会引起纳米晶体之间的能量转移，并且当凝胶加热形成溶胶时，这些聚集体可以可逆地分解。 TEM观察提供了能量转移的进一步证据，并表明CdSe NCs不仅规则地镶嵌在金属盐自组装体的表面上，而且还嵌入具有小尺寸纳米晶体的复合凝胶的自组装体内部。相比之下，在具有大纳米晶体的复合有机凝胶中，它们仅镶嵌在自组装的边缘。
To synthesize composite solid materials of metal salt and CdSe nanocrystals by a simple one-step method has been described. These solids can form stable gel in some organic solvent, such as benzene, cyclohexane and 1-butanol, especial in n-decane even below 0.1 wt/vol.%. Furthermore, these gels appear strong fluorescence which can be easily adjusted by the gel concentration. Temperature-dependent fluorescence spectra of composite gels suggested that the CdSe NCs aggregate together in gel state which would induce the energy transfer between nanocrystals and these aggregates could be reversibly disintegrated when gel was heated to form sol. TEM observations provided the further evidence of the energy transfer and suggested that the CdSe NCs were enchased regularly not only on the surface of self assembly of metal salt, but also embedded inside of self assembly in composite gel with small size nanocrystals. In contrast, in composite organogel with large nanocrystals they were only enchased on the edge of self assembly.