Carbon nanotube papers with p–n junctions along the thickness direction

Abstract

Conductive papers made from carbon nanotubes and wood fibers exhibit a p-type character. N₂ plasma treatment converts paper into n-type and conversion is verified by elemental analyses, work function and Hall-effect measurements. By screening one face of p-type paper in plasma, the p–n junctions are successfully created along the thickness direction and electrical rectification is evident by current–voltage measurement.