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用湿化学法在水溶液中合成了单分散的、大小尺寸可控的、巯基包裹的胶体CdTe纳米晶体,并利用CdTe纳米晶体和双功能分子poly(diallyldimethylammonium chloride)(PDDA)在Si衬底表面自组织生长了有序的层状纳米晶薄膜,荧光光谱研究了层状纳米晶体之间的共振能量迁移过程.结果表明:层状自组织生长的样品中纳米晶粒的间隔几乎一样,表明它们是有序排列的;而用直接干燥形成的样品中,小尺寸和大尺寸的纳米晶体之间间隔较短,发生荧光共振能量迁移,较小尺寸的纳米晶粒荧光峰(即波长较短处的晶粒荧光峰)部分淬灭,较大尺寸的荧光峰(即波长较长处的晶粒荧光峰)加强,使得PL谱出现明显的红移现象.
The monodispersed, size-controlled, mercapto-coated colloidal CdTe nanocrystals were synthesized by wet chemical method in aqueous solution. CdTe nanocrystals and diallyldimethylammonium chloride (PDDA) The orderly layered nanocrystalline films were grown and the fluorescence energy spectra were used to study the resonant energy transfer between the layered nanocrystals. The results show that the nanocrystal spacing in the layered self-organized samples is almost the same, indicating that they are In the sample formed by direct drying, the small-sized and large-sized nanocrystals have a short interval between them and undergo fluorescence resonance energy transfer. The smaller-sized nanocrystal fluorescence peak (that is, the crystal with the shorter wavelength Particle fluorescence peak) partially quenched, the larger size of the fluorescence peak (ie, the longer wavelength of the grain fluorescence peak) to strengthen, making the PL spectrum apparent red shift phenomenon.