Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences
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DOI:
10.7502/j.issn.1674-3962.2016.01.03
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Abstract:
As light-emitting nanocrystals, quantum dots (QDs) have been a major focus of research during the past two decades. The impetus can be attributed to their unique optical properties, with high fluorescence intensity, high photostability, multiple fluorescence colors, and size-tunable light emission. In recent years, the second near-infrared window QDs have emerged as a fluorescent probe for in vitro and in vivo imaging for maximal penetration depth and minimize autofluorescence. As a new type of second near-infrared window QDs, Ag2S has attracted increasing attention for ultralow toxicity, high stability, low cost, and good biocompatibility in the past five years. This review summarized the history, synthetic method, heterostructure, biological applications, and toxicology research of Ag2S QDs from domestic and international research results, and emphatically outlines its synthetic method. Furthermore, the existing problems of Ag2S QDs are discussed, and the prospects of the related research are presente.