化学
螺吡喃
荧光
光化学
激发态
汞菁
分析化学(期刊)
光致变色
费斯特共振能量转移
光学
原子物理学
色谱法
物理
作者
Xiaoyu Fang,Ding Duan,Jianping Ye,Kang Li
标识
DOI:10.1016/j.aca.2021.338938
摘要
The spiropyran (SP) compound is a typical photochromic compound. Its merocyanine configuration (MC) can accept energy and be excited by visible light, while the closed-loop configuration cannot. In this work, the SP was wrapped in β-cyclodextrin (β-CD-SP) firstly. When it was competitively replaced by thiamethoxam and dissociated out of β-CD, it would be converted to MC, which could be excited by visible light around 550 nm to produce red fluorescence. Here, CsPbBr3 was selected as the energy donor based on the principle of fluorescence resonance energy transfer (FRET). In order to connect with β-CD-SP and improve its stability, CsPbBr3 was wrapped in mesoporous silica, and then the second wrapping was performed to block those mesopores and the amination reaction was carried out (NH2–SiO2@CsPbBr3). Subsequently, NH2–SiO2@CsPbBr3 with green fluorescence (506 nm) was used as the internal standard and excitation light source for MC, and the red fluorescence of MC was used as the response signal to construct a ratiometric fluorescence sensor. When thiamethoxam was added and excited by 365 nm ultraviolet light, the energy would be transferred from NH2–SiO2@CsPbBr3 (506 nm) that emitted green fluorescence to MC, which emitted red fluorescence. So, the fluorescence color changed from green to yellow to red with the addition of the thiamethoxam. This sensor was employed to detect thiamethoxam in soil and yam.
科研通智能强力驱动
Strongly Powered by AbleSci AI