2016/07/14 by Milan Bouša, Milan Bousa, George Anagnostopoulos +12
Engineering · Materials Science · Physics and Astronomy · #Chemical vapor deposition #Composite material #Diamond and Carbon-based Materials Research #Doping #Graphene #Graphene nanoribbons #Graphene research and applications #Materials science #Nanopore and Nanochannel Transport Studies #Nanotechnology #Optics #Optoelectronics #Polymer #Raman spectroscopy #Stress (linguistics) #cond-mat.mtrl-sci
paper · pdf · doi:10.1002/pssb.201600233
published as Phys. Status Solidi B 253, No. 12, 2355-2361 2016
openalex publication_date 2016/07/14 · arxiv created 2018/01/17 · arxiv updated 2018/01/18 · openalex created_date 2021/02/01 · openalex updated_date 2026/08/05
Mechanical properties of graphene prepared by chemical vapour deposition (CVD) are not easily comparable to the properties of nearly perfect graphene prepared by mechanical cleavage. In this work, we attempt to investigate the mechanical performance of CVD graphene (simply supported or embedded in polymer matrix), transferred by two different techniques, under uniaxial loading with simultaneous in situ monitoring by Raman microspectroscopy. The level of charge transfer doping and strain is assessed using the vector analysis modified for uniaxial strain. The strain distribution across the samples varies significantly, owing to the growth and transfer process, which induces wrinkles and faults in the CVD graphene. In simply supported specimens, the stress transfer efficiency is generally very low and the changes in Raman spectra are dominated by variations in the charge transfer originating from the realignment of the domains on the substrate upon the application of strain. In contrast, samples covered with an additional polymer layer exhibit an improved stress transfer efficiency, and the alterations of charge doping levels are negligible. In fully embedded specimens, the variations in stress transfer efficiencies are caused by the size of the effective graphene domains defined by cracks, folds and/or wrinkles.