Chen Shihao, Duan Xiaoyi, Liu Cong, Liu Suqi, Li Pei, Su Dianbin, Sun Xia, Guo Yemin, Chen Wei, Wang Zhenhe
School of Agricultural Engineering and Food Science, Shandong University of Technology, No. 266 Xincun Xilu, Zibo, Shandong 255049, China.
School of Chemical and Chemical Engineering, Shandong University of Technology, No. 266 Xincun Xilu, Zibo, Shandong 255049, China.
J Hazard Mater. 2024 Apr 5;467:133672. doi: 10.1016/j.jhazmat.2024.133672. Epub 2024 Feb 1.
Trimethylamine (TMA), Dimethylamine (DMA), Ammonia (NH) and formaldehyde (HCHO) are typical volatile gases and able to cause great damage to the environment and the human body, and they may appear along in some particular cases such as marine meat spoilage. However, gas sensors can detect all the 4 hazardous gases simultaneously have rarely been reported. In this study, a quartz crystal microbalance (QCM) gas sensor modified with La-Ce-MOF was employed for the detection of 4 target gases (TMA, DMA, NH and HCHO). The sensor exhibited excellent stability (63 days), selectivity (3.51 Hz/(μmoL/L) for TMA, 4.19 Hz/(μmoL/L) for DMA, 3.14·Hz/(μmoL/L) for NH and 3.08·Hz/(μmoL/L) for HCHO), robustness and sensitivity towards target gases detection. Vienna Ab-initio Simulation Package calculations showed that this superior sensing performance was attributed to the preferential adsorption of target gas molecules onto the nanomicrospheres via hydrogen bond. The adsorption energy was - 0.4329 eV for TMA, - 0.5204 eV for DMA, - 0.6823 eV for NH and - 0.7576 eV for HCHO, all of which are physically adsorbed. In the detection of hazardous gases, sensor surface active sites were often susceptible to environmental factors and interfering substances, leading to a decrease in the sensitivity of the gas sensor, which in turn affects the signal accuracy in practical applications. This issue has been effectively addressed and the sensor has been implemented for the assessment of the salmon meat freshness, which may contribute to further advancements in the development of QCM gas sensors for monitoring food quality, human beings health and environment safety.
三甲胺（TMA）、二甲胺（DMA）、氨（NH₃）和甲醛（HCHO）是典型的挥发性气体，会对环境和人体造成极大危害，它们可能在某些特定情况下出现，比如海产肉类变质时。然而，能同时检测这四种有害气体的气体传感器鲜有报道。在本研究中，采用了一种用镧 - 铈金属有机框架（La - Ce - MOF）修饰的石英晶体微天平（QCM）气体传感器来检测四种目标气体（TMA、DMA、NH₃和HCHO）。该传感器在检测目标气体时表现出优异的稳定性（63天）、选择性（对TMA为3.51 Hz/(μmoL/L)，对DMA为4.19 Hz/(μmoL/L)，对NH₃为3.14 Hz/(μmoL/L)，对HCHO为3.08 Hz/(μmoL/L)）、稳健性和灵敏度。维也纳从头算模拟包计算表明，这种卓越的传感性能归因于目标气体分子通过氢键优先吸附在纳米微球上。TMA的吸附能为 - 0.4329 eV，DMA为 - 0.5204 eV，NH₃为 - 0.6823 eV，HCHO为 - 0.7576 eV，均为物理吸附。在有害气体检测中，传感器表面活性位点常常易受环境因素和干扰物质影响，导致气体传感器灵敏度下降，进而影响实际应用中的信号准确性。这个问题已得到有效解决，并且该传感器已用于评估三文鱼的肉质新鲜度，这可能有助于推动用于监测食品质量、人类健康和环境安全的QCM气体传感器的进一步发展。
