NUSNNI Chromium China Oxidation FuelCell 3-hexylthiophene thermal_property Kevlar temperature_control MolecularSelfAssembly StainlessSteel membrane Plug bias_mode HACrystal Butterfly ContactMode Phosphide Array Pinpoint PFM Heating PVAC Gong Bmp Resistance plastics VinylAlcohol semifluorinated_alkane 2d_materials Fujian ForceDistanceSpectroscopy mfm_amplitude MagneticForceMicroscopy biocompatible medical