School of Food and Biological Engineering , Hefei University of Technology , Hefei , Anhui 230009 , China.
Department of Chemistry, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) , University of Science and Technology of China , Hefei 230009 , China.
ACS Appl Mater Interfaces. 2020 Feb 5;12(5):6268-6275. doi: 10.1021/acsami.9b19434. Epub 2020 Jan 23.
Mercury ion (Hg), a bioaccumulating and toxic heavy metal, can cause severe damages to the environment and human health. Therefore, development of high-performance Hg sensors is highly desirable. Herein, we construct a uniform dodecahedral shaped N-doped carbon decorated by single Fe site enzyme (Fe-N-C SAE), which exhibits good performance for Hg detection. The N atom on Fe-N-C SAE can specifically recognize Hg through chelation between Hg and N atom, while the catalytic site on the single-atom enzyme acts as a signal amplifier. The Fe-N-C SAE-functionalized solution-gated graphene transistor exhibits a dramatic improvement in the selectivity and sensitivity of the devices. The sensor can rapidly detect Hg down to 1 nM within 2 s. Besides, a relatively good repeatability and reproducibility for the detection of Hg have also been found in our sensor platform. Our findings expand the application of single-atom catalysts in the field of food safety and environmental monitoring.
汞离子（Hg）是一种具有生物累积性和毒性的重金属，会对环境和人类健康造成严重损害。因此，开发高性能的汞传感器是非常有必要的。在此，我们构建了一种均匀的十二面体形状的氮掺杂碳，由单原子酶（Fe-N-C SAE）进行修饰，该结构对汞检测具有很好的性能。Fe-N-C SAE 上的氮原子可以通过汞与氮原子之间的螯合作用来特异性地识别汞，而单原子酶上的催化位点则作为信号放大器。Fe-N-C SAE 功能化的溶液门控石墨烯晶体管显著提高了器件的选择性和灵敏度。该传感器可以在 2 秒内快速检测低至 1 nM 的汞。此外，我们的传感器平台还表现出了较好的检测汞的重复性和再现性。我们的研究结果扩展了单原子催化剂在食品安全和环境监测领域的应用。
