Ananth semifluorinated alkane SingleCrystal SiliconeOxide LFM frequency_modulation Conductance PVAP3HT Granada Treatment Hexacontane Photovoltaics Platinum CBD rubber FM-KPFM STO BoronNitride ContactModeDots MembraneFilter Reading IISCBangalore FFM Fujian temp NUS_Physics EPFL BismuthVanadate SKKU HOPG Ecoli FrictionForce Polarization PS_PVAC FM_KPFM