▎ 摘　　要

NOVELTY - Silicon-based nanosheet having an energy band gap of 2.35-2.95 eV and a specific resistance of 104Ω x cm to 106Ω x cm. USE - The silicon-based nanosheet is useful in silicon-based material and composite sheet (all claimed) for electronic devices, and supercapacitors. ADVANTAGE - The silicon-based nanosheet has excellent electrical, mechanical and electrochemical properties and broadens the application area of silicon-based devices that are applied to various fields e.g. cathode materials for secondary batteries. DETAILED DESCRIPTION - INDEPENDENT CLAIM is also included for: producing the silicon-based nanosheet, comprising (i) preparing a metal-layered silicon-based compound in which metal particles are positioned between layers of the layered silicon-based compound by reacting the layered silicon-based compound with a metal salt, (ii) acid-treating the metal-layered silicon-based compound to prepare a proton-layered silicon-based compound in which protons are located between layers, and (iii) exfoliating the layered silicon compound by reacting the proton-layered silicon compound with an alkylammonium salt or an alkylamine; ilicon-based material prepared from the silicon-based nanosheet; and composite sheet comprising silicon-based nanosheets and graphene-based nanosheets,