Li Xian, Xu Chengcheng, Du Xiaosong, Wang Zhen, Huang Wenjun, Sun Jie, Wang Yang, Li Zhemin
Agricultural Information Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.
Foods. 2022 Jun 24;11(13):1879. doi: 10.3390/foods11131879.
The monitoring of ethylene is of great importance to fruit and vegetable quality, yet routine techniques rely on manual and complex operation. Herein, a chemiresistive ethylene sensor based on reduced graphene oxide (rGO)/tungsten diselenide (WSe)/Pd heterojunctions was designed for room-temperature (RT) ethylene detection. The sensor exhibited high sensitivity and quick p-type response/recovery (33/13 s) to 10-100 ppm ethylene at RT, and full reversibility and excellent selectivity to ethylene were also achieved. Such excellent ethylene sensing behaviors could be attributed to the synergistic effects of ethylene adsorption abilities derived from the negative adsorption energy and the promoted electron transfer across the WSe/Pd and rGO/WSe interfaces through band energy alignment. Furthermore, its application feasibility to banana ripeness detection was verified by comparison with routine technique through simulation experiments. This work provides a feasible methodology toward designing and fabricating RT ethylene sensors, and may greatly push forward the development of modernized intelligent agriculture.
乙烯监测对水果和蔬菜品质至关重要，但常规技术依赖人工且操作复杂。在此，设计了一种基于还原氧化石墨烯（rGO）/二硒化钨（WSe）/钯（Pd）异质结的化学电阻式乙烯传感器用于室温（RT）乙烯检测。该传感器在室温下对10 - 100 ppm乙烯表现出高灵敏度和快速的p型响应/恢复（33/13秒），并且对乙烯实现了完全可逆性和优异的选择性。这种优异的乙烯传感行为可归因于源自负吸附能的乙烯吸附能力的协同效应以及通过能带能量对齐促进电子在WSe/Pd和rGO/WSe界面间转移。此外，通过模拟实验与常规技术比较，验证了其在香蕉成熟度检测中的应用可行性。这项工作为设计和制造室温乙烯传感器提供了一种可行的方法，并可能极大地推动现代化智能农业的发展。
