Varistor Crystal Hair block_copolymer ring shape temperature_control NUS_NNI_Nanocore Lattice ScanningThermalMicroscopy Ito thermal_conductivity NUSNNI Polytetrafluoroethylene BlockCopolymer Growing AtomicSteps Ptfe HighAspect CHRYSALIS_INC Sio2 F14H20 Organic CuFoil Anneal MESA structure NanoLithography Device multi_layer Stiffness silicon_oxide ElectrostaticForceMicroscopy Polymer Chemical_Vapor_Deposition Display FAFailureAnlaysis