2D Nanodot and Nanowires Arrays of Titania and Silica with Tunable Morphologies via Self-Assembled Block Copolymers and Sol-gel Chemistry

摘要

Hybrid thin films composed of poly(styrene-b-ethylene oxide)(PS-b-PEO)and TiO(or SiO)with controlled morphology were fabricated using cooperative sol-gel chemistry and block copolymer(BCP)self-assembly.The inorganic precursors were selectively incorporated into PEO,and the volume fraction of PEO domain is increased with increasing sol-gel precursor/BCP ratio.The generated films exhibit various surface morphologies ranging from 0D nanodot to 1D nanowire arrays.If the composition of hybrid sol-gel/BCP is symmetric,the resulting film has nanowire morphology,whereas nanodot pattern was obtained from asymmetric composition.Given the same sol-gel precursor/BCP ratio,more uniform arrays of inorganic nanodots were induced when BCP template with asymmetric composition was employed.