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Controlled Synthesis of Ag2Te@Ag2S Core–Shell Quantum Dots with Enhanced and Tunable Fluorescence in the Second Near‐Infrared Window
Small ( IF 13.0 ) Pub Date : 2020-03-12 , DOI: 10.1002/smll.202001003
Yejun Zhang 1, 2 , Hongchao Yang 2 , Xinyi An 2 , Zan Wang 1, 2 , Xiaohu Yang 2 , Mengxuan Yu 2 , Rong Zhang 2 , Ziqiang Sun 1, 2 , Qiangbin Wang 1, 2, 3
Affiliation  

Fluorescence in the second near‐infrared window (NIR‐II, 900–1700 nm) has drawn great interest for bioimaging, owing to its high tissue penetration depth and high spatiotemporal resolution. NIR‐II fluorophores with high photoluminescence quantum yield (PLQY) and stability along with high biocompatibility are urgently pursued. In this work, a Ag‐rich Ag2Te quantum dots (QDs) surface with sulfur source is successfully engineered to prepare a larger bandgap of Ag2S shell to passivate the Ag2Te core via a facile colloidal route, which greatly enhances the PLQY of Ag2Te QDs and significantly improves the stability of Ag2Te QDs. This strategy works well with different sized core Ag2Te QDs so that the NIR‐II PL can be tuned in a wide range. In vivo imaging using the as‐prepared Ag2Te@Ag2S QDs presents much higher spatial resolution images of organs and vascular structures as compared with the same dose of Ag2Te nanoprobes administrated, suggesting the success of the core–shell synthetic strategy and the potential biomedical applications of core–shell NIR‐II nanoprobes.

中文翻译:

在第二个近红外窗口中具有增强和可调荧光的Ag2Te @ Ag2S核-壳量子点的受控合成

由于其高的组织穿透深度和高的时空分辨率,第二个近红外窗口(NIR-II,900-1700 nm)中的荧光引起了生物成像的极大兴趣。迫切需要具有高光致发光量子产率(PLQY)和稳定性以及高生物相容性的NIR-II荧光团。在这项工作中,成功设计了带有硫源的富含Ag的Ag 2 Te量子点(QDs)表面,以制备较大的带隙的Ag 2 S壳层,以通过便捷的胶体途径钝化Ag 2 Te核,从而大大提高了Ag 2 Te QD的PLQY可以显着提高Ag 2 Te QD的稳定性。此策略适用于不同尺寸的核心Ag 2Te QD,因此可以在广泛的范围内调节NIR-II PL。与使用相同剂量的Ag 2 Te纳米探针相比,使用制备的Ag 2 Te @ Ag 2 S QD进行的体内成像可显示更高的器官和血管结构空间分辨率图像,表明核-壳合成策略的成功以及核-壳NIR-II纳米探针的潜在生物医学应用。
更新日期:2020-04-14
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