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CsPbBr3 NCs Confined and In Situ Grown in ZIF-8: A Stable, Sensitive, Reliable Fluorescent Sensor for Evaluating the Acid Value of Edible Oils
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-07-31 , DOI: 10.1021/acsami.4c10280
Yuanchao Lu 1 , Ruixin Xiong 1 , Xingyu Lin 2 , Liangxiao Zhang 3 , Xianghe Meng 1 , Zisheng Luo 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-07-31 , DOI: 10.1021/acsami.4c10280
Yuanchao Lu 1 , Ruixin Xiong 1 , Xingyu Lin 2 , Liangxiao Zhang 3 , Xianghe Meng 1 , Zisheng Luo 2
Affiliation
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Rapidly and sensitively evaluating the acid value (AV) of edible oils is significant to ensuring food quality and safety. Cesium lead bromide perovskite nanocrystals (CsPbBr3 NCs) are an effective candidate for AV detection; however, their instability restricts wide applications. Herein, CsPbBr3@ZIF-8 was prepared by confining and growing CsPbBr3 NCs in situ into zeolitic imidazolate framework-8 (ZIF-8) to improve the stability, and a fluorescence sensor was established to evaluate the AV of edible oils. The results present that CsPbBr3 NCs (below 5 nm) with excellent optical properties were confined and grown in situ in micropores and mesopores of ZIF-8. Meanwhile, CsPbBr3@ZIF-8 had better long-term storage, ultraviolet-irradiation, and water-exposure stabilities, compared with CsPbBr3 NCs. Given the fact that free fatty acids (the major contributor of AV) decrease the fluorescence of CsPbBr3 NCs, the fluorescence intensities of CsPbBr3@ZIF-8 were negative-linearly related to oil AV (R2 = 0.9902) in 0.04–6.00 mg of KOH/g with a 0.06 mg of KOH/g limit of detection. Besides, the practical AV recovery was 92–101% with an average relative standard deviation of 2%. Furthermore, the detection time was 20 min. The response mechanism revealed that free fatty acids could remove surface ligands and increase surface defects to prompt the aggregation of CsPbBr3 NCs and the formation of lattice fringe dislocations, inducing a decrease in the fluorescence. Thus, a stable, sensitive, reliable sensor was established to evaluate the AV of edible oils.
中文翻译：
ZIF-8 中限制原位生长的 CsPbBr3 NC：一种稳定、灵敏、可靠的荧光传感器，用于评估食用油的酸值
快速、灵敏地评价食用油的酸价（AV）对于确保食品质量和安全具有重要意义。溴化铯铅钙钛矿纳米晶体（CsPbBr 3 NC）是 AV 检测的有效候选者；然而，它们的不稳定性限制了广泛的应用。在此，通过将CsPbBr 3 NCs原位限制和生长到沸石咪唑酯骨架-8（ZIF-8）中来制备CsPbBr 3 @ZIF-8以提高稳定性，并建立了荧光传感器来评估食用油的AV。结果表明，具有优异光学性能的CsPbBr 3 NCs（5 nm以下）被限制并原位生长在ZIF-8的微孔和介孔中。同时，与CsPbBr 3 NCs相比，CsPbBr 3 @ZIF-8具有更好的长期储存、紫外线照射和水暴露稳定性。鉴于游离脂肪酸（AV 的主要贡献者）会降低 CsPbBr 3 NC 的荧光，CsPbBr 3 @ZIF-8 的荧光强度与油 AV 呈负线性相关（ R 2 = 0.9902），范围为 0.04–6.00 mg KOH/g，检测限为 0.06 mg KOH/g。此外，实际 AV 回收率为 92-101%，平均相对标准偏差为 2%。此外，检测时间为20分钟。响应机制表明，游离脂肪酸可以去除表面配体并增加表面缺陷，促使CsPbBr 3 NCs聚集并形成晶格条纹位错，从而导致荧光减弱。因此，建立了一种稳定、灵敏、可靠的传感器来评估食用油的AV。
更新日期：2024-07-31
中文翻译：
ZIF-8 中限制原位生长的 CsPbBr3 NC：一种稳定、灵敏、可靠的荧光传感器，用于评估食用油的酸值
快速、灵敏地评价食用油的酸价（AV）对于确保食品质量和安全具有重要意义。溴化铯铅钙钛矿纳米晶体（CsPbBr 3 NC）是 AV 检测的有效候选者；然而，它们的不稳定性限制了广泛的应用。在此，通过将CsPbBr 3 NCs原位限制和生长到沸石咪唑酯骨架-8（ZIF-8）中来制备CsPbBr 3 @ZIF-8以提高稳定性，并建立了荧光传感器来评估食用油的AV。结果表明，具有优异光学性能的CsPbBr 3 NCs（5 nm以下）被限制并原位生长在ZIF-8的微孔和介孔中。同时，与CsPbBr 3 NCs相比，CsPbBr 3 @ZIF-8具有更好的长期储存、紫外线照射和水暴露稳定性。鉴于游离脂肪酸（AV 的主要贡献者）会降低 CsPbBr 3 NC 的荧光，CsPbBr 3 @ZIF-8 的荧光强度与油 AV 呈负线性相关（ R 2 = 0.9902），范围为 0.04–6.00 mg KOH/g，检测限为 0.06 mg KOH/g。此外，实际 AV 回收率为 92-101%，平均相对标准偏差为 2%。此外，检测时间为20分钟。响应机制表明，游离脂肪酸可以去除表面配体并增加表面缺陷，促使CsPbBr 3 NCs聚集并形成晶格条纹位错，从而导致荧光减弱。因此，建立了一种稳定、灵敏、可靠的传感器来评估食用油的AV。
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