ring shape Annealed Pyroelectric HardDisk Boundary MESA structure SmallScan Ram hetero_structure Polydimethylsiloxane vertical_PFM CBD EPFL PhaseImaging HighAspect Temasek_Lab optoelectronics Graphene SiWafer Layer ForceDistanceSpectroscopy nanobar LiBattery SurfaceChange Polyimide flakes LDPE SPMLabs FrictionForce Magnetic Force Microscopy Piezoresponse Conducting FrictionalForceMicroscopy Dr.JurekSadowski Device