Dislocations in Graphene Texas AM University石墨烯中的位错德克萨斯一家科技大学.pptxVIP

Dislocations in Graphene Alison Richardson Michael Kennedy Christopher Dismuke Abdulrahman Alabdulmohsin Overview Introduction Why Graphene? Why study dislocations in Graphene? Basic Principles Work performed Experiments Conducted Stone Wales Defect Results Introduction The movement of dislocation in crystals can determine: the strength of a material under a load the way it accommodate strain 3D analysis, High-resolution transmission electron microscopy (TEM), tracks the movement of dislocations Image Source: /products/electron-microscopes-and-focused-ion-beam/transmission-electron-microscopes/h-9500-300kv-te Transmission Electron Microscopy is used to study dislocation in graphene TEM produces images like the above depicting molecular structure Why Graphene Was Chosen Graphene is a two dimensional material Studying Graphene could simplify studying the movement of dislocations Using sophisticated TEM technique we can: see dislocations in graphene create dislocations in graphene move dislocations in graphene The results can improve our theoretical understanding on the effects of defects on mechanical properties Image Source: .sg/content/graphene Graphene Graphite Nanotube Fullerene Why Study Dislocations in Graphene? Understanding how dislocations deform helps describe Elasticity Plasticity in graphene Defects and strain can lead to spin and magnetism Extends graphene’s electronic applications into spin-based technology Example For the logic operations electrons move through the graphene use its spin state to compare the information held in the individual magnetic electrodes Image Source: /spin-based-magnetologic-gate-to-replace-silicon-chips Spin caused by dislocation Example: Graphene Biosensors Graphenes large surface area and strong bonding enables electrical detection of pathogenic species Source: /~chen658/research.htm Basic Principles In graphene, electronic properties can have noticeable effect on the mechanical properties