Grafting of derivatives of naphthalic anhydride onto amine-modified surfaces of dense nanosilica and their fractal features for luminescent performance
Grafting of derivatives of naphthalic anhydride onto amine-modified surfaces of dense nanosilica and their fractal features for luminescent performance
复制标题
萘二甲酸酐衍生物接枝到胺改性致密纳米二氧化硅表面及其发光性能的分形特征
DOI：
10.1016/j.jlumin.2018.10.094
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发表时间：
2019
影响因子：
3.6
通讯作者：
Xia Wu
中科院分区：
文献类型：
--
作者：
Junfang Li;Jinpeng Wang;Jihong Sun;Shiyang Bai;Xia Wu
采用胺基对高密度纳米二氧化硅微球（DNSS）进行表面修饰，并通过后接枝不同容量的苝-3.4.9.10-四甲酸二酐（PTD）和4-氨基-1，8-萘二甲酸酐（ANA），成功合成了新型DNSS基发光材料。利用XRD、SAXS、TEM、N2吸附、FT-IR、TG-DTG、光致发光、元素分析和时间分辨衰减等手段对材料的结构和性能进行了表征。结果表明，ANA或PTD在胺修饰的DNSS的外表面存在下均匀分布。结果表明，随着表面接枝量的增加，ANA的荧光发射峰从520 nm蓝移到504 nm，说明ANA的分散行为从聚集态向单层分散态转变。同时，荧光衰减寿命ANA-DNSS-10为4.49ns，PTD-DNSS-10为9.85ns，比我们以前报道的NA-DNSS-10的3.99ns长。SAXS图谱显示，随着PTD或ANA用量的增加，杂化材料的表面分形维数有增加的趋势，表明杂化材料表面接枝前后的结构不规则。这些观察结果表明APTES-DNSS基质中的表面效应对荧光行为起着重要作用。
The surfaces of density nano-silica spheres (DNSS) was modified using amine groups, and then novel luminescent DNSS-based materials were successfully synthesized via post-grafting various capacities of perylene-3.4.9.10-tetracarboxylic-dianhydride (PTD) and 4-amino-1,8-naphthalic anhydride (ANA). Meanwhile, their structures and properties were characterized by XRD, SAXS, TEM, N2sorption, FT-IR, TG-DTG, Photoluminescence and elemental analysis, as well as time-resolved decays. The results demonstrate that the ANA or PTD is uniformly distributed in the presence of outer surface of amine-modified DNSS. Two characteristic peaks centered at 525 nm and 560 nm with various amounts of surface-grafted PTD belong to aggregate states, comparably, the emission peak for ANA-DNSS samples presents the blue-shift from 520 nm to 504 nm with increasing amount of surface-grafted ANA, indicating the dispersion behaviors of ANA from aggregating to monolayer state. Meanwhile, the fluorescence decay lifetime is around 4.49ns for ANA-DNSS-10, 9.85ns for PTD-DNSS-10, longer than 3.99ns for NA-DNSS-10 in our previous report. Specially, the SAXS patterns show the increase tendencies for surface fractal value with increasing amount PTD or ANA, suggesting the structural irregularities of obtained hybrid materials for before and after surface grafting. These observations demonstrate that the surface effect in the APTES-DNSS matrix play an important role on the fluorescent behaviors.