Cobalt OrganicSemiconductor PVA suspended_graphene Microchannel HiVacuum piezoelectric force microscopy Vac Hafnium_dioxide Bmp Tin disulfide VerticalPFM Zhi CompactDisk LDPE MechanicalProperty polyvinyl acetate ScratchMode blended polymers SurfaceOxidation Conductive AFM Pyroelectric Plug Electronics Sadowski SurfaceChange Subhajjit Barium_titanate Heating Water PDMS P3HT FrictionalForceMicroscopy Defect GlassTemperature