Glucose and pH responsive fluorescence detection system based on simple synthesis of silicon-coated perovskite quantum dots

量子点 钙钛矿(结构) 过氧化氢 葡萄糖氧化酶 检出限 荧光 材料科学 水溶液 氧气 催化作用 化学 纳米技术 生物传感器 色谱法 光学 有机化学 物理 生物化学
作者
Mingcong Gao,Jiawei Li,Lei Qiu,Xinyi Xia,Xia Cheng,Feifei Xu,Guanhong Xu,Fangdi Wei,Jing Yang,Qin Hu,Yao Cen
出处
期刊:Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy [Elsevier BV]
卷期号:289: 122212-122212 被引量:12
标识
DOI:10.1016/j.saa.2022.122212
摘要

Perovskite quantum dots (PQDs) are extremely unstable in ambient air due to their inherent structural instability, which limits the wide application of PQDs. In this work, silicon-coated CsPbBr3 PQDs (CsPbBr3@SiO2) was synthesized via a simple method. The SiO2 coating effectively isolated PQDs from water and oxygen in the environment, which were the main elements that destroyed the structure stability of PQDs. The synthesized CsPbBr3@SiO2 can be stored in water for more than 2 months and posessed wonderful dispersibility in aqueous solution. The fluorescence intensity remained unchanged within 7 days and only decreased by 11.9 % within 2 months. We found that CsPbBr3@SiO2 was extremely sensitive to environmental pH, and the fluorescence intensity decreased with the reduction of pH. In addition, an excellent linear relationship with pH value in the range of 1.0 ∼ 5.0 was achieved. As we all known that glucose can be catalyzed by glucose oxidase to produce gluconic acid and hydrogen peroxide, in which a good deal of protons were produced and the pH was gradually lowered. Since CsPbBr3@SiO2 was stable to water and oxygen, and sensitive to ambient pH, we applied CsPbBr3@SiO2 to the detection of glucose. CsPbBr3@SiO2 showed fantastic selectivity and sensitivity to glucose, and the detection limit can even reach 18.5 μM. Furthermore, CsPbBr3@SiO2 was successfully applied to the detection of glucose in the human serum with satisfactory performance.
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