Metal-organic frameworks encapsulating gold nanoclusters and carbon dots for ratiometric fluorescent detection of formaldehyde in real food samples, construction materials and indoor environments

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL Microchimica Acta Pub Date : 2025-01-20 DOI:10.1007/s00604-025-06959-8

Man Du, Meimei Song, Shuang Hou, Yue Zhang, Haijun Lv, Shuchun Zhao, Hongxia Du, Hongyong Guo

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Abstract

A novel fluorescence sensing nanoplatform (CDs/AuNCs@ZIF-8) encapsulating carbon dots (CDs) and gold nanoclusters (AuNCs) within a zeolitic imidazolate framework-8 (ZIF-8) was developed for ratiometric detection of formaldehyde (FA) in the medium of hydroxylamine hydrochloride (NH₂OH·HCl). The nanoplatform exhibited pink fluorescence due to the aggregation-induced emission (AIE) effect of AuNCs and the internal filtration effect (IFE) between AuNCs and CDs. Upon reaction between NH₂OH·HCl and FA, a Schiff base formed via aldehyde-diamine condensation, releasing hydrochloric acid. The acid triggered the degradation of ZIF-8, releasing CDs and AuNCs, and thereby shifting the fluorescence to blue as the CDs disperse. The nanoplatform demonstrated high sensitivity (LOD of 0.26-2.19 μM), exceptional selectivity, and rapid response time (<1 min) toward FA. Additionally, test strips and hydrogel films integrated with smartphones were prepared for on-site and visual detection of FA. The portable and smartphone-assisted test strips effectively detected indoor FA gas, while wearable and intelligent hydrogel films provided reliable surface measurements of FA on fruits and vegetables. Real sample analyses achieved satisfactory FA recoveries (99.06-115.30%) with relative standard deviations (RSD) from 1.86% to 3.81%. The innovative sensing nanoplatform served as a promising approach for FA detection in food, construction materials, and indoor air quality, offering both analytical accuracy and convenient visualization.

Graphical Abstract

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包裹金纳米团簇和碳点的金属有机框架用于比例荧光检测真实食品样品、建筑材料和室内环境中的甲醛

建立了一种新型荧光传感纳米平台（CDs/AuNCs@ZIF-8），该平台将碳点（CDs）和金纳米团簇（AuNCs）包裹在沸石咪唑酸骨架-8 （ZIF-8）中，用于比例检测盐酸羟胺（NH2OH·HCl）介质中的甲醛（FA）。由于AuNCs的聚集诱导发射（AIE）效应和AuNCs与CDs之间的内部过滤效应（IFE），纳米平台呈现出粉红色荧光。NH2OH·HCl与FA反应后，醛-二胺缩合形成席夫碱，释放出盐酸。酸触发ZIF-8的降解，释放CDs和aunc，从而使CDs分散时荧光变为蓝色。该纳米平台对FA具有高灵敏度（LOD为0.26-2.19 μM）、高选择性和快速响应时间（1 min）。此外，制备了与智能手机集成的试纸和水凝胶膜，用于FA的现场和视觉检测。便携式和智能手机辅助测试条有效检测室内FA气体，而可穿戴和智能水凝胶膜提供可靠的水果和蔬菜FA表面测量。实样分析FA回收率为99.06 ~ 115.30%，相对标准偏差（RSD）为1.86% ~ 3.81%。创新的传感纳米平台为食品、建筑材料和室内空气质量中的FA检测提供了一种有前途的方法，提供了分析准确性和方便的可视化。图形抽象

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.