ring shape Fujian Boron silicon_carbide Sapphire Battery PvdfBead Display CrystalGrowing Silicon neodymium_magnets Fendb NiFe membrane self-assembled_monolayer Flake MagneticArray MBE ThinFilm SolarCell TempControl Led ItoGlass Polystyrene Magnetostrictive VinylAlcohol hetero_structure thermal_conductivity flakes AAO Oxidation exfoliate hard_disk KAIST PDMS