Lasing and magnetic microbeads loaded with colloidal quantum dots and iron oxide nanocrystals

被引：5

作者：

Li, Minxu ^{[1
,2
]}

You, Guanjun ^{[2
,4
]}

Wang, Andrew Y. ^{[3
]}

Hu, Wenjia ^{[1
]}

Wang, Jingkang ^{[1
]}

Sun, Fengqing ^{[2
]}

Zhu, Yiming ^{[4
]}

Henderson, Ron ^{[5
]}

Xu, Jian ^{[2
]}

机构：

[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[2] Penn State Univ, Dept Engn Sci & Mech, State Coll, PA 16802 USA

[3] Ocean NanoTech LLC, Fayetteville, AR 72701 USA

[4] Shanghai Univ Sci & Technol, Engn Res Ctr Opt Instrument & Syst, Minist Educ, Shanghai 200093, Peoples R China

[5] Middle Tennessee State Univ, Murfreesboro, TN 37132 USA

来源：

NANOSCALE | 2013年 / 5卷 / 20期

基金：

美国国家科学基金会;

关键词：

MESOPOROUS SILICA; OPTICAL GAIN; CORE/SHELL NANOCRYSTALS; HIGH-PERFORMANCE; BEADS; ADSORPTION; RESONANCE; EMISSION; SHELL; CORE;

D O I：

10.1039/c3nr02896h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This study investigates the feasibility of loading nanostructured lasing medium and magnetic nanocrystals in the same microbead for potential applications in bio- and chemical sensing. A sequential infiltration process is proposed and tested for the preparation of magnetic and lasing microbeads by incorporating, respectively, iron oxide nanocrystals in the inner cores and colloidal quantum dots (CQDs) in the periphery regions of mesoporous silica microbeads. The co-doped bead structure was confirmed by electron microscopy and energy dispersive spectroscopy. The lasing action of the CQD gain medium in the mesoporous beads was characterized with micro-photoluminescence, revealing sharp whispering gallery mode lasing signatures, whereas the distinguishing superparamagnetic property was measured from the co-doped microbeads with vibrating sample magnetometry.

引用

页码：9598 / 9603

页数：6

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