Phosphor-free silica-coating of monodisperse cores for dual functionalization with luminescent and mesoporous shell
Phosphor-free silica-coating of monodisperse cores for dual functionalization with luminescent and mesoporous shell
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DOI：
10.1016/j.micromeso.2016.12.014
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发表时间：
2017-03-15
影响因子：
5.2
通讯作者：
Konno, Mikio
中科院分区：
文献类型：
--
作者：
Ishii, Haruyuki;Kawai, Shunsuke;Konno, Mikio
为了实现单分散核芯的发光和介孔双功能化，采用双链阳离子表面活性剂二十二烷基二甲基溴化铵（DDAB）对平均粒径小于100 nm的单分散核芯进行了正硅酸四乙酯的水解和缩合。通过在芯上均匀涂覆二氧化硅壳，获得了高度单分散的芯壳颗粒。在500℃下煅烧二氧化硅壳，去除掺入的DDAB表面活性剂，使其具有介孔和发光性能，而不使用任何荧光粉。烷基链比DDAB长的二十六基二甲基溴化铵（DHAB）可以扩大介孔的尺寸。将硅壳形成与煅烧相结合的方法应用于单分散聚合物芯中，得到了单分散、发光的中空介孔硅颗粒（hms），其内部有一个小于100 nm的空腔。激发波长为365 nm时，随着硅芯上形成的介孔壳体积的增加，介孔壳的发射强度急剧增加，表明有机残留物产生的发光中心均匀分布在介孔壳中。(C) 2016 Elsevier Inc.版权所有。
To dually functionalize monodisperse cores with luminescence and mesopores, hydrolysis and condensation of tetraethyl orthosilicate in the presence of a double chain cationic surfactant of didodecyldimethylammonium bromide (DDAB) were applied to monodisperse silica cores with an average size smaller than 100 nm. Highly monodisperse core-shell particles were obtained by uniform coating of the cores with silica shell. Calcination of the silica shell at 500 degrees C to remove the incorporated DDAB surfactant provided the shells with mesoporous and luminescent properties without using any phosphors. The size of mesopores could be expanded by using dihexadecyldimethylammonium bromide (DHAB) with alkyl chains longer than DDAB. The combination of silica shell formation and calcination was also applied to monodisperse polymer cores, which created monodisperse, luminescent, hollow mesoporous silica particles (HMSs) with a sub-100 nm cavity inside. The emission intensity of mesoporous shell measured with an excitation wavelength of 365 nm could be sharply increased by an increase in the volume of mesoporous shell formed on the silica cores, implying that the luminescent centers derived from organic residue homogeneously distributed in the mesoporous shell. (C) 2016 Elsevier Inc. All rights reserved.