3D Rutile Titania-Based Structures with Morpho Butterfly Wing Scale Morphologies

摘要

The attractive optical,chemical,biochemical,and mechanical properties of the rutile polymorph of titanium dioxide(titania)have led to its use in powder or film form in paints,plastics,cosmetics,sunscreens,interference coatings,separation membranes,gas sensors,and as a food additive.Three-dimensional(3D)porous networks of rutile titania are also of considerable interest for separation/sorption,optical,and biomedical applications.The assembly of 3D porous networks of rutile with well-controlled solid and pore morphologies is an active area of research.A number of groups have synthesized titania structures that have well-organized 3D arrays of macropores/voids by applying coatings of the anatase polymorph of titania on organic templates and then removing the templates.However,attempts to completely convert organized 3D anatase/pore structures into rutile titania replicas,by heat treatment at>800°C,have resulted in appreciable grain growth and distortion of the solid/pore structures.