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Boosting and Activating NIR-IIb Luminescence of Ag2Te Quantum Dots with a Molecular Trigger
Analytical Chemistry ( IF 6.7 ) Pub Date : 2021-12-08 , DOI: 10.1021/acs.analchem.1c04164
Dan Song 1 , Mengting Zhu 1 , Chenchen Li 1 , Yan Zhou 1 , Yudan Xie 1 , Zhen Li 1 , Zhihong Liu 1
Affiliation  

Near-infrared (NIR) excited and NIR-IIb emissive Ag2Te quantum dots (QDs) display significant advantages in luminescence bioimaging and biosensing due to their unique photophysical properties. However, the poor luminescence intensity and limited strategy for constructing activatable probes severely restrict the wide bioapplications of Ag2Te QDs. Herein, we proposed a NIR dye-sensitization strategy to solve these two problems. First, we used IR-780 as the antenna for Ag2Te QDs to improve the ability of harvesting excitation light, obtaining 21-fold luminescence enhancement at 1620 nm under an 808 nm laser irradiation. Subsequently, by further functionalizing the heptamethine cyanine with a recognition unit of glutathione (GSH), Cy-GSH with target-triggered emission was yielded, which served as the potential sensitizer for Ag2Te QDs to fabricate an activatable ratiometric NIR-IIb nanoprobe for visualizing GSH in vivo with high contrast. This new strategy is expected as a powerful tool to promote the bioapplication of NIR-IIb QDs in the future.

中文翻译:

用分子触发器增强和激活 Ag2Te 量子点的 NIR-IIb 发光

近红外 (NIR) 激发和 NIR-IIb 发射的 Ag 2 Te 量子点 (QD) 由于其独特的光物理特性在发光生物成像和生物传感中显示出显着优势。然而,用于构建可激活探针的较差的发光强度和有限的策略严重限制了 Ag 2 Te QD的广泛生物应用。在此,我们提出了一种 NIR 染料敏化策略来解决这两个问题。首先,我们使用 IR-780 作为 Ag 2的天线Te QD 提高了收集激发光的能力,在 808 nm 激光照射下在 1620 nm 处获得 21 倍的发光增强。随后,通过用谷胱甘肽(GSH)识别单元进一步功能化七甲炔花青,产生了具有目标触发发射的 Cy-GSH,其作为 Ag 2 Te QDs的潜在敏化剂,用于制造可激活的比率 NIR-IIb 纳米探针,用于以高对比度在体内可视化 GSH 。这一新策略有望成为未来促进 NIR-IIb QD 生物应用的有力工具。
更新日期:2021-12-21
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