BSc Edgars Butanovs (ISSP UL Laboratory of Semiconductor Optoelectronics)
Graphene, a single monolayer of covalently bonded carbon atoms, is intriguing material due to its electronic, mechanical and thermal properties. There are many graphene synthesis methods such as mechanical exfoliation of highly-oriented pyrolytic graphite, epitaxial growth on silicon carbide, chemical vapour deposition on Cu or Ni substrates, etc. Mechanical cleavage from HOPG using transfer stamp printing is becoming a popular method for obtaining graphene sheets of desirable shape. The main advantages of prepatterned graphene sheet stamp printing method is its flexibility, scalability and low cost.
Direct laser scribing and nanoindentation was used to produce desired patterns on the HOPG. Silicone glue and PDMS epoxy was used to prepare stamps for graphene transfer stamp printing onto the substrate. Transferred few-layer graphene sheets were imaged with optical and scanning electron microscopes, atomic force microscope was used for the thickness measurements.
Different methods of obtaining graphene, its properties and potential applications will be discussed in the talk, and detailed study of HOPG micropatterning methods for graphene stamp printing on silicon wafer will be presented.