Array LFM WS2 Singapore molecular_beam LateralForceMicroscopy Etch PinPointMode Conducting DeoxyribonucleicAcid Sapphire BismuthVanadate Device Al2O3 HumanHair pulsed_laser_deposition PVAC Sidewall Spain suspended_graphene Calcium Piezoresponse Lanthanum_aluminate KevlarFiber LiquidCell Wang rubber Resistance Neodymium StrontiuTitanate PS_PVAC Topography BTO TemperatureControllerStage SSRM