Ruina Liu is a master's student enrolled by Professor Qing Dai in 2014. Her research direction is the study of the properties of graphene plasmons in graphene molybdenum disulfide heterostructures. She published an academic paper as the first author on the international journal Nanoscale during the semester, and won the honorary title of "Three Good Students" of the University of Chinese Academy of Sciences in June 2016, and the second prize scholarship of the director of the National Center for Nanoscience and Technology in September 2016. The graduation reply was successfully completed at 10:00 a.m. on May 22, 2017 in the conference room on the third floor of the south building of the National Center for Nanoscience and Technology! Guangjun Nie, Kaihui Liu, Jianing Chen, Fengliang Dong and Peipei Chen were invited as assessment expert. Congratulate Ruina Liu on her successful graduation, and hope her future work and life will be great!