College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China.
Small. 2020 Oct;16(42):e2003429. doi: 10.1002/smll.202003429. Epub 2020 Sep 29.
Antimonene quantum dots (AMQDs) are attracting considerable attention due to their fascinating physicochemical properties. However, research on their semiconductor characteristics, especially the photoluminescence performance, is still in a preliminary stage and the experimental verification is scarcely reported, significantly restricting their further applications. Herein, the photoluminescence property of AMQDs is experimentally verified. The AMQDs are prepared by probe sonication-assisted liquid-phase exfoliation and show robust blue fluorescence, and the photoluminescence is hardly affected by pH. In view of the derivatization reaction of tetracyclines (TET) at different pHs, AMQDs are developed as a pH-mediated dual-channel ratiometric fluorescent probe for TET detection. Under acidic conditions, the AMQDs' probe exhibits unique recognition behavior due to the inherent fluorescence of TET and the solvent-enhancing effect, that is, the fluorescence changes from blue to red. Under alkaline conditions, this fluorescent probe realizes the transition from blue to yellow-green because of the decomposition of TET. The limits of detection are 27 × 10 and 74 × 10 m, respectively. The high sensitivity and remarkable fluorescence changes make AMQDs ideal probes for TET sensing. Additionally, this is the first report on the photoluminescence property of AMQDs. It is believed that this work will open a new avenue for AMQDs in optical sensing fields.
锑烯量子点（AMQDs）由于其迷人的物理化学性质而引起了相当大的关注。然而，关于它们的半导体特性，特别是光致发光性能的研究仍处于初级阶段，实验验证很少有报道，这极大地限制了它们的进一步应用。在此，我们对 AMQDs 的光致发光特性进行了实验验证。通过探针超声辅助液相剥离法制备了 AMQDs，其具有强的蓝色荧光，且光致发光几乎不受 pH 值的影响。鉴于四环素（TET）在不同 pH 值下的衍生化反应，我们将 AMQDs 开发为一种 pH 介导的双通道比率荧光探针，用于 TET 的检测。在酸性条件下，由于 TET 的固有荧光和溶剂增强效应，AMQDs 探针表现出独特的识别行为，即荧光从蓝色变为红色。在碱性条件下，由于 TET 的分解，该荧光探针实现了从蓝色到黄绿色的转变。检测限分别为 27×10 和 74×10 m。高灵敏度和显著的荧光变化使 AMQDs 成为 TET 传感的理想探针。此外，这是关于 AMQDs 光致发光特性的第一篇报道。相信这项工作将为 AMQDs 在光学传感领域开辟新的途径。
