Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China.
Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China; State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China.
J Hazard Mater. 2024 Oct 5;478:135471. doi: 10.1016/j.jhazmat.2024.135471. Epub 2024 Aug 13.
Functionalized thermosensitive hydrogel materials exhibit excellent properties for the fabrication of sensing devices that enable real-time visual detection of food safety duo to their good plasticity and powerful loading capacity. Here, a ratiometric fluorescent device based on an interpenetrating network (IPN) thermosensitive hydrogel was designed to embed functionalized Au nanoclusters (Au NCs) and Blue Carbon dots (BCDs) composites in a multi-network structure to build a sensitive hazardous material nitrite (NO) chemsensor. The hydrogel was utilized poloxamer 407 (P407), lignin and cellulose to form stable IPN structure, which resulted in complementation and synergy, thereby strengthening its porous network structure. The combination of fluorescent nanoprobes with the porous network structure has the potential to enhance stable fluorescence signals and improve sensing sensitivity. Moreover, the thermosensitive liquid-solid transition characteristics of the hydrogel facilitate its preparation into diverse sensing devices following curing at room temperature. The hydrogel device, when combined with a smartphone system, converted image information into data information, thereby enabling the accurate quantification of NO with a detection limit of 9.38 nM in 2 s. The designed multi-functional hydrogel device is capable of real-time differentiation of NO dosage with the naked eye, offering a high-contrast, rapid-response sensing methodology for visual assessment of food freshness. This research contributes to the expansion of hydrogel materials applications and the detection of hazardous materials in food safety.
功能化的温敏水凝胶材料具有良好的可塑性和强大的负载能力，非常适合用于制造传感设备，可实现食品安全的实时可视化检测。在这里，设计了一种基于互穿网络（IPN）温敏水凝胶的比率荧光装置，将功能化的金纳米簇（Au NCs）和蓝色碳点（BCDs）复合材料嵌入到多网络结构中，以构建对敏感有害物质亚硝酸根（NO）的化学传感器。该水凝胶利用泊洛沙姆 407（P407）、木质素和纤维素形成稳定的 IPN 结构，从而产生互补和协同作用，从而增强其多孔网络结构。荧光纳米探针与多孔网络结构的结合有望增强稳定的荧光信号并提高传感灵敏度。此外，水凝胶的温敏液-固转变特性使其能够在室温下固化后制备成各种传感装置。该水凝胶装置与智能手机系统结合，将图像信息转换为数据信息，从而能够在 2 秒内以 9.38 nM 的检测限对 NO 进行准确定量。所设计的多功能水凝胶装置能够实现 NO 剂量的实时肉眼区分，为食品新鲜度的视觉评估提供高对比度、快速响应的传感方法。这项研究有助于扩展水凝胶材料的应用和食品安全中有害物质的检测。
