Xia Jie, Huang Wentao, Majer-Baranyi Krisztina, Zhang Mengjie, Zhang Xiaoshuan
College of Engineering, China Agricultural University, Beijing 100083, China.
Food Science Research Group, Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences, Herman Ottó út 15, H-1022 Budapest, Hungary.
ACS Appl Mater Interfaces. 2023 Sep 27;15(38):45095-45105. doi: 10.1021/acsami.3c08621. Epub 2023 Sep 14.
Rapid nondestructive detection of fish freshness is essential to ensure food safety and nutrition. In this study, we demonstrate a conformal temperature/impedance sensing patch for temperature monitoring, as well as freshness classification during fish storage. The optimization of the flexible laser-induced graphene electrodes is studied based on both simulation and experimental validation, and dimensional accuracy of 5‰ and high impedance reproducibility are obtained. A laser-assisted thermal reduction technology is innovatively introduced to directly form a reduced graphene oxide-based temperature-sensitive layer on the surface of a flexible substrate. The comprehensive performance is superior to that of most reported temperature-sensitive devices based on graphene materials. As an application demonstration, the fabricated flexible dual-parameter sensing patch is conformed to the surface of a refrigerated fish. The patch demonstrates the ability to accurately sense low temperatures in a continuous 120 min monitoring, accompanied by no interference from high humidity. Meanwhile, the collected impedance data are imported into the support vector machine model to obtain a freshness classification accuracy of 93.07%. The conformal patch integrated with crosstalk-free dual functions costs less than $1 and supports free customization, providing a feasible methodology for rapid nondestructive detection or monitoring of food quality.
快速无损检测鱼类新鲜度对于确保食品安全和营养至关重要。在本研究中，我们展示了一种用于温度监测以及鱼类储存期间新鲜度分类的保形温度/阻抗传感贴片。基于模拟和实验验证研究了柔性激光诱导石墨烯电极的优化，获得了5‰的尺寸精度和高阻抗重现性。创新性地引入激光辅助热还原技术，在柔性基板表面直接形成基于还原氧化石墨烯的温度敏感层。其综合性能优于大多数已报道的基于石墨烯材料的温度敏感器件。作为应用示范，所制备的柔性双参数传感贴片贴合在冷藏鱼的表面。该贴片在连续120分钟的监测中展示了准确感测低温的能力，且不受高湿度干扰。同时，将采集到的阻抗数据导入支持向量机模型，获得了93.07%的新鲜度分类准确率。集成了无串扰双功能的保形贴片成本低于1美元，并支持免费定制，为食品质量的快速无损检测或监测提供了一种可行的方法。
