Zhu Yongheng, Wu Jiafa, Zhang Zhaohuan, Wu Weihao, Wang Xingyu, Zhao Yong, Zhao Cheng
College of Food Science and Technology, International Research Center for Food and Health, Shanghai Ocean University, Shanghai 201306, China.
Henan Railway Food Safety Management Engineering Technology Research Center, Zhengzhou Railway Vocational & Technical College, Zhengzhou 451460, China.
ACS Sens. 2025 Jun 27;10(6):4348-4360. doi: 10.1021/acssensors.5c00570. Epub 2025 Jun 3.
The presence of formaldehyde (HCHO) in foods can pose specific health risks, including irritation, allergic reactions, and potential long-term health issues due to its toxic properties. The application of metal oxide semiconductor gas sensors to detect trace levels of HCHO in aquatic products has garnered growing interest. Consequently, a reliable and optimized metal organic framework derivation method combined with a postmodification process is utilized to synthesize different aspect ratio InO hexagonal hollow nanotubes (HHNT) assembled by InO nanocrystals. After that, PtCu nanoparticles (NPs) are loaded on these materials for further sensitization. The sensors constructed by 1.5 wt % PtCu/InO HHNT exhibit significant HCHO sensing properties, including high response, rapid response/recovery time (6 s/9 s), good selectivity, and low limit of detection (50 ppb HCHO) at a low temperature. Moreover, XPS, UV-vis, the time-dependent in situ DRIFTS, and activation energy calculation are applied to analyze the gas-sensing mechanism. The excellent gas-sensing performances of as-prepared materials are attributed to the small aspect ratio, unique hollow morphology, and uniform load of PtCu NPs, which provide a large specific surface area, mesopores that facilitate gas penetration, abundant active sites, oxygen spillover effect, and bimetallic synergistic effect. The outstanding HCHO assessment of seafood ( and scallops) proves that the as-constructed sensors pave the way for in situ and rapid HCHO evaluation in aquatic products and have the potential to be extended to the HCHO detection in the environment and public health.
食品中甲醛（HCHO）的存在会带来特定的健康风险，包括刺激、过敏反应以及因其毒性特性而可能导致的长期健康问题。应用金属氧化物半导体气体传感器检测水产品中痕量甲醛已引起越来越多的关注。因此，采用一种可靠且优化的金属有机框架衍生方法并结合后修饰工艺，合成了由InO纳米晶体组装而成的不同纵横比的InO六方空心纳米管（HHNT）。之后，将PtCu纳米颗粒（NPs）负载在这些材料上以进一步提高灵敏度。由1.5 wt% PtCu/InO HHNT构建的传感器表现出显著的甲醛传感特性，包括高响应、快速的响应/恢复时间（6 s/9 s）、良好的选择性以及在低温下低至50 ppb甲醛的低检测限。此外，运用XPS、紫外可见光谱、时间分辨原位漫反射红外傅里叶变换光谱以及活化能计算来分析气敏机理。所制备材料优异的气敏性能归因于其小纵横比、独特的空心形态以及PtCu NPs的均匀负载，这些特性提供了大的比表面积、有利于气体渗透的中孔、丰富的活性位点、氧溢流效应和双金属协同效应。对海鲜（和扇贝）出色的甲醛评估证明，所构建的传感器为水产品中甲醛的原位快速评估铺平了道路，并且有潜力扩展到环境和公共卫生领域的甲醛检测。
