▎ 摘　　要

Superuniform nanosized gates (nanogates; 0.41 +/- 0.02 nm in size) were donated on graphene sheets of single wall carbon nanohorn (SWCNH) particles by controlled oxidation. Superuniform nanogate donation confers high molecular selectivity and large adsorption capacity upon SWCNH. The molecular selectivity of CO2 over CH4 attains 17 below 0.01 MPa by the nanogate separation.