功能化的纳米间隙电极及其在低浓度乙烯快速检测中的应用

Ethylene is a natural ripening agent which strongly affects growth, development and shelf-life of fruits, vegetables and ornamental crops..During the logistics process, the farm produce also can gradually release ethylene gas to promote the maturation. Due to the lack of.effective detect method of low concentration ethylene, it is very hard to monitor the maturity of the farm produce,which may cause.huge loss. This project focus on the detect problems of the low concentration ethylene, put forward a feasible approach of construct .the noble modified nanogap devices achieving the fast selective detection of the low concentration ethylene. The noble metal.nanoparticles were modified in the microgap to reduce length of the interdigitated microelectrode and forming the nanogap device.Butadiene was modified on the surface of the noble metal nanoparticles. Because of the Diels-Alder reaction principle, the ethylene.molecular can react with butadiene and forming cyclohexene. Utilizing the difference of conductivity between butadiene and cyclohexene,.ethylene can be easily and selectively detected. The noticeable method of in situ seeding growth of AuNPs is performed to further reduce.the gap length, which would largely enhance the sensitivity and detection limits. Furthermore, the noble metal nanoparticles also can use as the catalyst to accelerate the reaction rate and lowering the reaction temperature. The development of the project would provide a.theoretical basis and experimental evidence for the fast and selective detection of ethylene during the logistics process.

乙烯是一种重要的植物生长激素，它可以调节农产品的成熟进程，在农业物联网中的仓储和运输环节是一个十分重要的监测指标。常规检测方法很难实现对低浓度乙烯气体的快速检测，因此发展快速检测低浓度乙烯的新原理与新方法对完善农业物联网具有重要意义。本项目针对低浓度乙烯难以快速检测的问题，提出纳米间隙电极检测低浓度乙烯的框架方案。采用贵金属纳米颗粒原位生长法构筑间纳米间隙电极，通过功能化修饰在贵金属纳米颗粒表面修饰上丁二烯基，在贵金属纳米颗粒催化作用下利用丁二烯与乙烯进行“狄尔斯-阿尔德反应”实现对乙烯分子的快速捕捉，利用丁二烯与反应生成的环己烯导电性的差异实现对乙烯的快速选择性检测。本项目的顺利开展将为农产品仓储、物流中乙烯监测提供新的设计思路和检测方法。

乙烯是一种重要的植物生长激素，它可以调节农产品的成熟进程，在农业物联网中的仓储和运输环节是一个十分重要的监测指标。本项目针对低浓度乙烯难以快速检测的问题，构筑纳米间隙电极，通过表面功能化修饰在贵金属纳米颗粒表面修饰上丁二烯基，在贵金属纳米颗粒催化作用下利用丁二烯与乙烯的狄氏反应，利用丁二烯与反应生成的环己烯导电性的差异实现对乙烯的快速选择性检测实现对乙烯分子的快速捕捉以及快速检测。此外，针对乙烯气体的快速高灵敏检测，本课题还对电导式乙烯传感器开展了一定研究，探索了多孔纳米材料在乙烯气敏检测中的应用，达到了对乙烯气体经过三年不懈的努力，课题组按时完成了研究计划，取得了预期的研究成果，实现了ppb级的乙烯快速检测。在课题执行过程中，已接受和发表SCI收录学术论文8篇，申请发明专利2项，协助培养研究生5名，其中博士生1名，硕士生4名，完成了课题任务书的计划任务，实现了预期的目标。