【摘要】 用再沉淀法制备了纳米晶体,向体系中加入水溶性高分子聚乙烯醇(PVA)可有效地抑制纳晶的生长,从而制得了稳定的具有不同粒径的纳晶.光谱研究表明,随着纳晶粒径增加,由于纳晶中分子间相互作用的变化,其吸收峰和激发峰位置都发生了红移,同时纳晶中激基缔合物的荧光发射峰强度减弱,荧光寿命有所延长.更多还原

【Abstract】 Optical size dependent properties of perylene nanocrystals were studied by the addition of polyvinyl alcohol (PVA) to a water suspension of perylene nanocrystals prepared by reprecipitation method.Because PVA could bind with the nanocrystals,it will inhibit the growth of the nanocrystals,so that we could obtain stable nanocrystals with different sizes.By analyzing the absorption and excitation spectra of the nanocrystals with different sizes,it was found that their absorption and excitation peaks underwent red shift while the size of the nanocrystals increased,which may be due to the change of the interactions between perylene molecules.Also with increasing crystal size,the excimer emission of perylene nanocrystals was weakened and the decay time of the excimer was prolonged.更多还原