Document Detail

TiO2 Synthesis Inspired by Biomineralization: Control of Morphology, Crystal Phase and Light-Use efficiency in a Single Process.
MedLine Citation:
PMID:  22578231     Owner:  NLM     Status:  Publisher    
Hydroxyapatite is mineralized along the long axis of collagen fiber during osteogenesis. Mimicking such biominer- alization has great potential to control inorganic structures and is fast becoming an important next-generation inorganic synthesis method. Inorganic matter synthesized by biomineralization can have beautiful and functional structures that cannot be created arti- ficially. In this study, we applied biomineralization to the synthesis of the only photocatalyst in practical use today, titanium dioxide (TiO2). The photocatalytic activity of TiO2 mainly relates to three properties: morphology, crystal phase, and light-use efficiency. To optimize TiO2 morphology, we used a simple sequential peptide as an organic template. TiO2 mineralized by a β-sheet peptide nanofiber template forms fiber-like shapes that are not observed for mineralization by peptides in the shape of random coils. To optimize TiO2 crystal phase, we mineralized TiO2 with the template at 400 oC to transform it into the rutile phase and at 700 oC to transform it into a mixed phase of anatase and rutile. To optimize light-use efficiency, we introduced nitrogen atoms of the peptide into the TiO2 structure as doped elemental material during sintering. Thus, this biomineralization method enables control of inor- ganic morphology, crystal phase, and light-use efficiency in a single process.
Takayuki Nonoyama; Takatoshi Kinoshita; Masahiro Higuchi; Kenji Nagata; Masayoshi Tanaka; Kimiyasu Sato; Katsuya Kato
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-11
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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