中文摘要：

采用一种再沉淀-封装法制备了掺杂香豆素6(C6)的杂化荧光纳米颗粒,并通过SEM和DLS对其进行了形貌和粒径大小表征。在450 nm光激发下,制备的C6掺杂纳米颗粒表现出绿色荧光。通过比较光致发光光谱随掺杂浓度的变化,得出C6掺杂纳米颗粒的浓度猝灭是因为分子间能量转移而非C6分子聚集所致。另外,由于所选聚合物基质材料PS和PMMA分子结构的区别,导致PS-基质和PMMA-基质的纳米颗粒的光谱形状不同。C 6分子在PS-基质的纳米颗粒中处于两种不同的微环境,所以发射峰较宽;PMMA是线性分子,PMMA-基质的纳米颗粒中只存在一种局域环境,所以发射峰较窄。高的掺杂浓度会超过纳米颗粒对C6分子的负载能力,从而导致C6分子在水溶液中聚集。

英文摘要：

Coumarin 6( C6) doped fluorescent hybrid nanoparticles( NPs) were prepared by a reprecipitation-encapsulation method. The as-prepared NPs were characterized by SEM and DLS. The C6-doped NPs gave strong green fluorescence under the excitation of 450 nm. The concentration-dependent fluorescence of C6-doped NPs was then studied. The results indicated that the fluorescence of C6 was quenched by intermolecular energy transfer rather than by aggregation. In addition,the difference in spectral shape of PS-based and PMMA-based NPs was interpreted from the view of polymer structure. The broad emission band in PS-based NPs was attributed to two different microenvironments surrounding C6,while the narrower emission band in PMMA-based NPs to one local environment. Finally,the loading capacity of the hybrid NPs for C6 is studied,and higher doping concentration will result in aggregates in water.