A method of fabricating a nanoshell is disclosed. The method comprises coating a nanometric core made of a first material by a second material, to form a core-shell nanostructure and applying non-chemical treatment to the core-shell nanostructure so as to at least partially remove the nanometric core, thereby fabricating a nanoshell. The disclosed nanoshell can be used in the fabrication of transistors, optical devices (such as CCD and CMOS sensors), memory devices and energy storage devices.