期刊
NANO LETTERS
卷 18, 期 2, 页码 1159-1167出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04700
关键词
Organasilica nanodots; metal-free fluorescent nanoprobe; ultrahigh quantum efficiency; lysosomal tracking; organelle-specific imaging
类别
资金
- National Natural Science Foundation of China [21673037]
- Natural Science Foundation of Jiangsu Province [BK20170078]
- Six Talents Peak Project in Jiangsu Province [2015-SWYY-003]
- Graduate Students' Scientific Research Innovation Project of Jiangsu Province Ordinary University [KYCX17_0155]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1777]
- Fundamental Research Funds for the Central Universities
- University of Michigan
- Innovative and Entrepreneurial Talent Recruitment Program of Jiangsu Province
Water-dispersible nanomaterials with superbright photoluminescence (PL) emissions and narrow PL bandwidths are urgently desired for various imaging applications. Herein, for the first time, we prepared ultrasmall organosilica nanodots (OSiNDs) with an average size of similar to 2.0 nm and similar to 100% green-emitting PL quantum efficiency via a one-step :hydrothermal treatment of two commercial reagents (a silane molecule and rose bengal). In particular, the structural reorganization and halide loss. of rose bengal during the hydrothermal treatment contribute to the ultrahigh quantum yield and low phototoxicity of OSiNDs. Owing to their low pH-induced precipitation/aggregation property, the as-prepared OSiNDs can be used as excellent lysosomal trackers with many advantage: (1) They have superior lysosomal targeting ability with a Pearson's coefficient of 0.98; (2) The lysosomal Monitoring time of OSiNDs is up to 48 h, which is much longer than those of commercial lysosomal trackers (<2 h); (3) They do not disturb the, pH environment of lysosomes and can be used to visualize lysosomes in living, fixed) and permeabilized cells; (4) They exhibit intrinsic lysosomal tracking ability without the introduction of lysosome-targeting ligands (such as morpholine) and superior photostability; (5) The easy,,cost-effective, and scalable synthetic method further ensures that these OSiNDs can be readily used as exceptional lysosomal trackers. We expect that the ultrasmall OSiNDs with superior fluorescence properties and easily modifiable surfaces could be applied as fluorescent nanoprobes, light-emitting diode phosphor, and anticounterfeiting material, which should be able to promote the preparation and application of silicon-containing nanomaterials.
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