Molybdenum Phosphide Pores conductive Thermoplastic_polyurethane Microchannel CuParticle NUS_NNI_Nanocore Polytetrafluoroethylene Force-distance non_contact Edwin aluminum_nitride Roughness IMT_Bucharest fe_nd_b optoelectronics KevlarFiber Scratch ConductingPolymer FrictionalForceMicroscopy Photovoltaics Pyroelectric NUS C36H74 MESA structure ScanningTunnelingMicroscopy ForceVolumeImage Etch Mapping BTO OpticalWaveguide LFM Christmas PS_LDPE