One-step preparation of pyrene-doped silica particles with tunable emmision and their application for ethanol detection
One-step preparation of pyrene-doped silica particles with tunable emmision and their application for ethanol detection
复制标题
一步法制备可调谐发射的芘掺杂二氧化硅颗粒及其在乙醇检测中的应用
DOI：
10.1016/j.colsurfa.2016.06.053
复制
发表时间：
2016
影响因子：
5.2
通讯作者：
Wensheng Yang
中科院分区：
文献类型：
--
作者：
Zilong Guo;Yanan Guan;Weishi Zheng;Zhenzhen Huang;Wensheng Yang
本工作以十六烷基三甲基溴化铵(CTAB)胶束为辅助，采用改进的Stöber法制备了Py掺杂二氧化硅粒子。在这种一步法中，通过优化反应溶液中乙醇/水的体积比，从而优化染料在溶剂和十六烷基三甲基溴化铵胶束中的分布，可以在很大的浓度范围内(20⿿200μM)将染料掺入二氧化硅颗粒中，效率高达90%。通过改变反应液中Py的浓度，可以很容易地调节粒子的发射颜色。在低浓度时，二氧化硅粒子的发光主要以芘单体的紫光发射为主。当浓度较高时，二氧化硅颗粒的发光主要由芘准分子的绿色所控制。将绿色的二氧化硅粒子重新分散到乙醇/水混合物中后，粒子的发射颜色对乙醇的含量很敏感。随着乙醇含量的增加，二氧化硅颗粒的发光颜色由绿色到蓝色再到紫色，这归因于掺杂染料的促进释放，从而抑制了准分子的发射。
In this work, pyrene-doped silica particles were prepared by a modified Stöber method with the assistance of cetyltrimethylammonium bromide (CTAB) micelles. In this one-step approach, incorporation efficiency of the dye into the silica particles could be improved to be as high as 90% in a wide range of pyrene concentration (20⿿200 μM) by optimizing the volume ratio of ethanol/water in the reaction solution and thus the distribution of the dye in the solvent and CTAB micelles. Emission color of the particles was tunable readily by changing the concentration of pyrene in the reaction solution. At low pyrene concentration, emission of the silica particles was dominated by the violet emission of pyrene momomer. At high pyrene concentration, emission of the silica particles was dominated by the green color of pyrene excimer. After redispersing the silica particles with green color into the ethanol/water mixture, emission color of the particles was sensitive to the content of ethanol. Emission color of the silica particles evolved from green to blue and then violet with the increased content of ethanol attributed to the promoted release of the doped dye and thus suppressed emission of the excimer.