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在水相中合成了巯基丙酸(MPA)包覆的CdTe量子点(QDs),采用透射电子显微镜和原子力显微镜对其进行表征.利用荧光光谱、紫外-可见吸收光谱和红外光谱研究了CdTe QDs与绿原酸(CHA)的相互作用.结果表明,CHA可显著猝灭CdTe QDs的荧光,在一定的浓度范围内,荧光猝灭值与CHA的浓度呈现一定的线性关系.推断其主要猝灭机理为动态猝灭,并实现了荧光光谱法测定CHA.向CdTe QDs-CHA体系中加入血管紧张素Ⅰ(AngⅠ)后,CdTe QDs荧光在一定浓度范围内逐渐恢复,从而实现了CdTe QDs的荧光可逆调控.CdTe QDs荧光的猝灭与恢复过程对于荧光传感的设计以及荧光可逆调控机理的研究具有指导意义.
In aqueous phase, mercaptopropionic acid (MPA) -coated CdTe quantum dots (QDs) were synthesized and characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM). Fluorescence spectra, UV- (CHA) .The results show that CHA can significantly quench the fluorescence of CdTe QDs, and at a certain concentration range, there is a certain linear relationship between the fluorescence quenching value and CHA concentration.It is inferred that the main quenching The mechanism was dynamic quenching, and fluorescence spectrometry was used to determine CHA.After adding angiotensin Ⅰ (AngⅠ) into CdTe QDs-CHA system, the fluorescence of CdTe QDs gradually recovered within a certain range of concentration, thus the fluorescence of CdTe QDs was achieved Reversible regulation.CdTe QDs fluorescence quenching and recovery process for fluorescence sensing design and fluorescence reversible regulation mechanism of guidance.