The monthly seminar talk, for the month of May of the MNS department, will be presented by Dr. Zulfiqar H Khan, an assistant professor of physics, of the University of Dhaka on Thursday the 24th May at 1:30 p.m. in room number UB 21511. Dr Khan will talk on ‘Investigation of Mechanical Properties of Graphene on Silicon Wafers’.
Everyone is most cordially invited to attend the seminar talk.
ABSTRACT: Graphene is an atomically thin two-dimensional crystalline material with very low mass, high Young’s modulus, high elastic strength, high-electron mobility, high thermal conductivity and high biocompatibility. Due to these extraordinary properties, graphene may enable many promising applications. However, an insufficient adhesion between graphene and its substrate due to its 2D nature is a crucial limiting factor for wafer-level fabrication and operation of reliable devices. This talk focuses on the ultrahigh adhesion energy of large-area monolayer graphene as-grown on silicon carbide on silicon where the graphene has been synthesized using a Ni/Cu catalytic alloy. The adhesion energy between graphene and the underlying SiC has been measured as 5.7 J/m2 by double cantilever beam testing, suggesting a fivefold stronger adhesion compared to graphene transferred on silicon dioxide.
As the obtained adhesion energy is a good starting point for achieving reliable resonant sensors, this talk also discusses the fabrication of graphene coated SiC membranes and investigates the influence of graphene coating on the quality factor. Significant reduction of damping has been observed when a graphene over layer is present on SiC membranes as opposed to the use of a conventional metal layer.
Short biography of the speaker:
Zulfiqar Hasan Khan is an assistant professor in Physics department at University of Dhaka and a former lecturer in MNS department at BRAC University. He studied physics at University of Dhaka and secured 1st class 3rd position in BS honours exam and 1st class 1stposition in MS exam. He did MS thesis on Laser Induced Breakdown Spectroscopy (LIBS) and received prestigious NSICT fellowship from Bangladesh government. He received Ph.D. in nanotechnology from University of Technology Sydney (UTS), working on mechanical properties of graphene on silicon carbide and on silicon wafers. During PhD, Dr. Zulfiqar has been the recipient of the best three-minute presentation award from school of Electrical and Data Engineering, UTS and also obtained a competitive financial grant for visiting Stanford University, USA to perform collaborative research.