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.

中文翻译：

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实时可视化检测亚硝酸盐的多形变互穿网络热敏水凝胶荧光装置


功能化热敏水凝胶材料由于其良好的可塑性和强大的负载能力，在制造传感装置方面表现出优异的性能，可实现食品安全的实时视觉检测。在此，设计了一种基于互穿网络（IPN）热敏水凝胶的比率荧光装置，将功能化金纳米团簇（Au NC）和蓝碳点（BCD）复合材料嵌入多网络结构中，以构建敏感的有害物质亚硝酸盐（NO ）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，产生互补和协同作用，从而强化其多孔网络结构。荧光纳米探针与多孔网络结构的结合有可能增强稳定的荧光信号并提高传感灵敏度。此外，水凝胶的热敏液-固转变特性有利于其在室温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，可将图像信息转换为数据信息，从而能够在2秒内准确定量NO，检测限为9.38 nM。所设计的多功能水凝胶装置能够用肉眼实时区分NO剂量，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。这项研究有助于扩大水凝胶材料的应用以及食品安全中有害物质的检测。