期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 126, 期 -, 页码 115-120出版社
ELSEVIER
DOI: 10.1016/j.colsurfb.2014.11.030
关键词
Quantum dots; Ambient synthesis; Multivalent polymers; Near-infrared emission; Cell imaging
资金
- National Natural Science Foundation of China [21475071, 21405086, 21275082, 21203228, 81102411]
- National Key Basic Research Development Program of China (973 special preliminary study plan) [2012CB722705]
- Taishan Scholar Program of Shandong Province
- Natural Science Foundation of Qingdao [13-1-4-128-jch, 13-1-4-202-jch]
- Postdoctoral Science Foundation of China and Shanghai [2013M531164, 13R21413800]
In this study, we described a facile ambient one-pot aqueous synthesis of fluorescent Ag2Te quantum dots (QDs) adopting multivalent polymers (poly(maleic anhydride) homopolymers) as stabilizers. In experiments, Ag2Te QDs were synthesized via a stepwise addition of the stabilizers, precursors (AgNO3/Na2TeO3) and promoters (NaBH4/N2H4 center dot H2O) in ambient one-pot aqueous solution. By regulating the compositions of raw materials, water-dispersed Ag2Te QDs (3.8-4.7 nm) were achieved and exhibited tunable photoluminescence (PL) emission (995-1068 nm) in the second near-infrared (NIR-II) region, accompanying with the minimized surface coating thickness (1.5-1.9 nm). Such compact coating of multivalent polymers promoted PL emission of Ag2Te QDs, so showing high PL quantum yields (PLQYs: 13.1-15.2%). In addition to compact sizes and high PLQYs, experimental results testified that the Ag2Te QDs demonstrated high photo-/colloidal stability and ultralow cytotoxicity, which implied their promising applications, especially serving as an effective nanoprobe for bioimaging in the NIR-II biological window. (C) 2014 Elsevier B.V. All rights reserved.
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