Protein-Mediated Layer-by-Layer Syntheses of Freestanding Microscale Titania Structures with Biologically Assembled 3-D Morphologies

被引：64

作者：

Fang, Yunnan ^{[1
]}

Wu, Qingzhong ^{[1
]}

Dickerson, Matthew B. ^{[1
,2
]}

Cai, Ye ^{[1
]}

Shian, Samuel ^{[1
,3
]}

Berrigan, John D. ^{[1
]}

Poulsen, Nicole ^{[3
]}

Kroeger, Nils ^{[1
,3
]}

Sandhage, Kenneth H. ^{[1
,3
]}

机构：

[1] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

[2] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

[3] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 24期

关键词：

PRESERVING REACTIVE CONVERSION; BIOSILICA TEMPLATES; TIO2; FILMS; THIN-FILMS; TEMPERATURE; BIOMINERALIZATION; DIATOMS; SILICA; 3D; NANOCRYSTALS;

D O I：

10.1021/cm9011525

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A simple protein-mediated approach for preparing freestanding (silica free) microscale titania structures with morphologies inherited from complex-shaped, three-dimensional (3-D) biosilica templates (diatom frustules) is demonstrated. The silica diatom frustules were exposed in a repetitive alternating fashion to a silica-binding, titania-forming protein (protamine) and then to an aqueous titania precursor to build up a conformal titania-bearing coating. After organic pyrolysis at 500 degrees C, the conformal, continuous nature of the resulting crystalline anatase titania coating was confirmed by (i) demonstrating that a titania-coated frustule acted as a sensitive electrochemical hydrogen detector and (ii) selectively removing the silica templates to yield freestanding titania structures that retained the 3-D diatom frustule shape.

引用

页码：5704 / 5710

页数：7

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