Alternating copolymers consisting of phenyl-capped bithiophene (Red units)

and oligo(ethylene glycol) hierarchically self-assemble into nanosheets

via polymer folding in some organic solvents. Due to folded conformation,

thickness of nanosheets is only 3.5 nm. Lateral size of nanosheet is controllable

by temperature and concentration of solution. Chemical modification of nanosheet surface

is possible via Cu-catalyzed Huisgen cycloaddition without disrupting nanosheet structure.