Carbon-coated mesoporous silica with hydrophobicity and electrical conductivity

摘要

The pore surface of mesoporous silica SBA-15 was coated with 2,3-dihydroxynaphthalene(DN)through a dehydration reaction between the surface silanol groups in SBA-15 and the hydroxyl groups of the DN molecules.By the carbonization of DN in the SBA-15 pores,the pore surface was uniformly covered with an extremely thin carbon layer,which comprised only 1-2 graphene sheets.The resulting carbon-coated SBA-15 still possessed the characteristics of the original SBA-15-large surface area and pore volume,long-range ordered structure,and sharp mesopore size distribution.In addition,the carbon-coated SBA-15 showed marked hydrophobicity and high electrical conductivity,both of which are not intrinsic properties of SBA-15.The appearance of these features can be explained from the almost perfect carbon coating on the pore surface.Newly developed graphene coating technique can donate characteristic carbon properties to mesoporous silica.