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Oxazine-Functionalized CdSe/ZnS Quantum Dots for Photochemical pH Sensing
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-16 , DOI: 10.1021/acsanm.0c02219 Hongxia Zhang 1, 2 , Qingwen Jin 1, 2 , Xiaomin Song 1, 2 , Hongdi Li 1, 2 , Dagong Jia 1, 2 , Tiegen Liu 1, 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-16 , DOI: 10.1021/acsanm.0c02219 Hongxia Zhang 1, 2 , Qingwen Jin 1, 2 , Xiaomin Song 1, 2 , Hongdi Li 1, 2 , Dagong Jia 1, 2 , Tiegen Liu 1, 2
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pH is the most important chemical parameter of an aqueous solution, and it is widely used in biochemistry, environmental science, and other fields. In this article, we have successfully prepared an application-type ratiometric photochemical pH sensor combining semiconductor nanomaterial CdSe/ZnS quantum dots (QDs) and oxazine 170 perchlorate (O170). This sensor facilitated fluorescence resonance energy transfer (FRET) between CdSe/ZnS QDs (donor) and O170 (acceptor) due to the dipole–dipole interaction. Molar absorption coefficient, Foster radius, and FRET efficiency were determined, and the experimental FRET efficiency was found to be very close to the theoretical value. Thus, we utilized the interaction of QD nanomaterials and the O170 dye to promote oxazine-functionalized CdSe/ZnS QDs and revealed the principle of the FRET-based sensor. We mixed these two substances to form a sensitive film that covered the end face of an optical fiber. The experimental results showed that the FRET-based fiber-optic pH sensor exhibited a large detection range and good performance in terms of linearity, sensitivity, and repeatability. The pH sensor studied by the photochemical method has great application potential in the fields of marine monitoring and environmental protection.
中文翻译：
用于光化学pH传感的恶嗪功能化CdSe / ZnS量子点
pH是水溶液最重要的化学参数，广泛用于生物化学，环境科学和其他领域。在本文中，我们已经成功地制备了将半导体纳米材料CdSe / ZnS量子点（QDs）和高恶嗪170（O170）结合在一起的应用型比例光化学pH传感器。由于偶极-偶极相互作用，该传感器促进了CdSe / ZnS QD（供体）和O170（受体）之间的荧光共振能量转移（FRET）。测定了摩尔吸收系数，Foster半径和FRET效率，发现实验FRET效率非常接近理论值。因此，我们利用QD纳米材料和O170染料的相互作用来促进恶嗪官能化的CdSe / ZnS QD，并揭示了基于FRET的传感器的原理。我们将这两种物质混合在一起，形成覆盖光纤端面的敏感膜。实验结果表明，基于FRET的光纤pH传感器在线性，灵敏度和可重复性方面表现出较大的检测范围和良好的性能。用光化学方法研究的pH传感器在海洋监测和环境保护领域具有巨大的应用潜力。
更新日期：2020-11-25
中文翻译：
用于光化学pH传感的恶嗪功能化CdSe / ZnS量子点
pH是水溶液最重要的化学参数，广泛用于生物化学，环境科学和其他领域。在本文中，我们已经成功地制备了将半导体纳米材料CdSe / ZnS量子点（QDs）和高恶嗪170（O170）结合在一起的应用型比例光化学pH传感器。由于偶极-偶极相互作用，该传感器促进了CdSe / ZnS QD（供体）和O170（受体）之间的荧光共振能量转移（FRET）。测定了摩尔吸收系数，Foster半径和FRET效率，发现实验FRET效率非常接近理论值。因此，我们利用QD纳米材料和O170染料的相互作用来促进恶嗪官能化的CdSe / ZnS QD，并揭示了基于FRET的传感器的原理。我们将这两种物质混合在一起，形成覆盖光纤端面的敏感膜。实验结果表明，基于FRET的光纤pH传感器在线性，灵敏度和可重复性方面表现出较大的检测范围和良好的性能。用光化学方法研究的pH传感器在海洋监测和环境保护领域具有巨大的应用潜力。
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