Cancer Polyvinylidene frequency_modulation Ecoli PS_LDPE PolyvinylideneFluoride exfoliate Polyethylene Fiber IIT-chennai Laser SiliconCrystal #Materials PUR Alkane Switching Sadowski GaP KevlarFiber Vacuum kelvin probe force microscopy Mechinical Plug MBE UTEM ULCA UnivCollegeLondon PatternedSapphireSubstrat ConductingPolymer contact Lattice PinPointMode Implant ElectroChemical Conducting