Formation and photopatterning of nanoporous titania thin films

Photopatternable nanoporous titania thin films were generated from mixtures of an organic diblock copolymer, poly(styrene- b -ethylene oxide) ( PS - b - PEO ) , and an oligomeric titanate (OT) prepared from a chelated titanium isopropoxide. The PS - b - PEO templates well-defined microdomains in thi...

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Bibliographic Details
Published in:Applied physics letters 2007-06, Vol.90 (23), p.233102-233102-3
Main Authors: Park, Oun-Ho, Cheng, Joy Y., Kim, Hyun Suk, Rice, Philip M., Topuria, Teya, Miller, Robert D., Kim, Ho-Cheol
Format: Article
Language:English
Subjects:
CHELATING AGENTS
CHEMICAL BONDS
COPOLYMERS
CROSS-LINKING
ETHYLENE
HEAT TREATMENTS
MATERIALS SCIENCE
MIXTURES
MOLECULAR WEIGHT
NANOSTRUCTURES
POROUS MATERIALS
STYRENE
THIN FILMS
TITANATES
TITANIUM OXIDES
ULTRAVIOLET RADIATION
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Summary:Photopatternable nanoporous titania thin films were generated from mixtures of an organic diblock copolymer, poly(styrene- b -ethylene oxide) ( PS - b - PEO ) , and an oligomeric titanate (OT) prepared from a chelated titanium isopropoxide. The PS - b - PEO templates well-defined microdomains in thin films of the mixtures, which upon thermal treatment at 450 ° C , become nanopores in titania. Average pore size and porosity are controlled by the molecular weight and loading level of the PS - b - PEO , respectively. Patterns of nanoporous titania were created by selectively exposing UV light on the mixture films. The UV irradiation destroys the chelating bond and induces the cross-linking reaction of the OT. Subsequent wet development followed by thermal treatment gives patterned nanoporous films of anatase phase titania.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2746081