Non-toxic Cs3Bi2Br9 quantum dots molecular imprinted nanocomposite with boronate affinity and imprinting selectivity for selective detection of oxytetracycline

• Published in: Journal of alloys and compounds 2024-10, Vol.1002, p.175329, Article 175329
• Main Authors: Wei, Xiao, Gao, Yue, Zhang, Shen, Chen, Aixia, Liu, Jiali, Wang, Fei, Kerboua, Ilhem, Yan, Mengwei, Wang, Jiaqi, Zhang, Yuhui
• Format: Article
• Language: English
• Subjects: Bismuth-based perovskite quantum dots; Boronate affinity; Fluorescence detection; Molecular imprinting; Oxytetracycline
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2024.175329

In this work, a non-toxic bismuth-based perovskite quantum dot fluorescent nanocomposite (Cs3Bi2Br9@SiO2-MIPs) was constructed for the detection of trace oxytetracycline (OTC) in the ethanol phase, which solves the toxicity problem of perovskite quantum dots and realises the application of non-toxic perovskite quantum dots in analysis and detection, the combination boronate affinity effect and molecularly imprinted technology enables highly selective detection of the Cs3Bi2Br9@SiO2-MIPs. The basic structure and optical properties of Cs3Bi2Br9@SiO2-MIPs were characterized by various characterization methods, and the optimal detection conditions and fluorescence detection ability of Cs3Bi2Br9@SiO2-MIPs for OTC were determined. Under the optimal conditions, the Cs3Bi2Br9@SiO2-MIPs had a good linear relationship with OTC in the concentration range of 0.8 ∼ 130 μM, and the detection limit was 0.32 μM. Furthermore, the fluorescence detection mechanism of the Cs3Bi2Br9@SiO2-MIPs was investigated in detail, which ultimately revealed that the detection mechanism was a synergistic effect of inner filter effect and fluorescence resonance energy transfer. The Cs3Bi2Br9@SiO2-MIPs was successfully applied to the detection of trace OTC in real samples. This work provides a new idea for the construction of environmentally friendly and highly selective perovskite quantum dot fluorescent nanocomposite. •A novel non-toxic Cs3Bi2Br9@SiO2-MIPs fluorescent sensor was constructed for OTC detection.•The toxicity of PQDs was solved by using bismuth instead of lead.•The combination of boronate affinity and molecular imprinting achieves high selective detection of OTC.•The fluorescence quenching mechanism was fully explored.