主讲人：Robert J. Young教授
邀请人：付绍云教授
讲座时间：2024年10月22日15:00
讲座地点：A区理科楼205教室
讲座内容：
The deformation and fracture of mechanically-exfoliated monolayer graphene has been studied in detail. Through in-situ Raman mapping at different strain levels, the distributions of strain over the graphene flakes were determined from the shift of the graphene Raman 2D band. The evolution and propagation of cracks in exfoliated monolayer graphene single crystals and their associated stress fields have also been studied using Raman spectroscopy. The current understanding of the mechanical properties of nanocomposites reinforced with graphene will be discussed and the parameters that affect the mechanical properties of the materials identified. It will also show how Raman spectroscopy can be utilized for monitoring stress transfer from the matrix to the reinforcement. Finally the use of Raman spectroscopy to characterize the mechanics of the deformation of van der Waals heterostructures consisting of stacked monolayers of graphene and MoS2 will be demonstrated where it will be shown that failure occurs through competition between interfacial slippage and fracture of the MoS2.
主讲人简介：
Robert Young教授是英国皇家科学院院士、英国皇家工程院院士、欧洲科学院院士。他的学术研究涵盖高分子和复合材料的结构与力学性能之间的各个方面，他在该领域出版了多本书籍和超过450篇论文，H指数100。他与英国、欧洲大陆和中国的学术界和工业界合作开展了许多研究项目。他应用拉曼光谱技术监测高性能纤维和复合材料的变形过程已经得到了广泛的发展，并扩展到其他材料，如碳纳米管和蜘蛛丝。2009年，他与曼彻斯特大学物理和天文学院的Novoselov教授合作，利用拉曼光谱技术研究石墨烯复合材料，研究了石墨烯和包括其他二维材料在内的纳米复合材料的结构和变形的各个方面。
