Vinylpyridine Dopped Piezoresponse layers Gong FM-KPFM Bacterium MolecularSelfAssembly Composition Pattern Sulfur MechanicalProperty HighAcpectRatio Glass LaAlO3 molecular_beam Copolymer Force-distance Au111 Calcium Switching chemical_compound SiliconCrystal SICM FailureAnlaysis Chungnam_National_University ThinFilm Aggregated_molecules SAM PDMS PolyvinylideneFluoride AM_KPFM GaP Optical Biology