Institute for Materials Science, University of Stuttgart, Germany.
Langmuir. 2010 May 4;26(9):6494-502. doi: 10.1021/la9039557.
The deposition of ceramic thin films from aqueous solutions at low temperature using biopolymers as templates has attracted much attention due to economic and environmental benefits. Titanium dioxide is one of the most attractive functional materials and shows a wide range of applications across vastly different areas because of its unique chemical, optical, and electrical properties. In the present work, we deposited smooth, nanocrystalline titania thin films by an aqueous deposition method on surface active and amphipathic proteins of fungal origin called hydrophobins. Initially, the hydrophobin molecules were self-assembled on a silicon substrate and characterized by angle-resolved X-ray photoelectron spectroscopy (AR-XPS), atomic force microscopy (AFM) and surface potential measurements. Thin films of titanium dioxide were deposited on the surface of hydrophobin self-assembled monolayers from aqueous titanium(IV) bis(ammonium lactate) dihydroxide solution at near-ambient conditions. The microstructure of the as-deposited films was analyzed by AFM, scanning and transmission electron microscopy, which revealed the presence of nanocrystals. The titania films were also characterized using AR-XPS and Fourier transform infrared spectroscopic (FTIR) techniques. Appropriate mechanisms involved in film deposition are suggested. Additionally, nanoindentation tests on as deposited titania films showed their high resistance against mechanical stress.
由于具有经济和环境效益，利用生物聚合物作为模板，在低温下从水溶液中沉积陶瓷薄膜引起了广泛关注。二氧化钛是最具吸引力的功能材料之一，由于其独特的化学、光学和电学性质，在广泛不同的领域有着广泛的应用。在本工作中，我们通过水相沉积法在真菌来源的表面活性剂和两亲性蛋白质（称为疏水性蛋白）上沉积了光滑的纳米晶二氧化钛薄膜。最初，疏水性蛋白分子在硅衬底上自组装，并通过角分辨 X 射线光电子能谱（AR-XPS）、原子力显微镜（AFM）和表面电势测量进行了表征。在近环境条件下，将钛（IV）双（乳酸铵）二羟氧化物的水溶液涂覆在疏水性蛋白自组装单层的表面上，沉积了二氧化钛薄膜。采用原子力显微镜、扫描和透射电子显微镜对沉积后的薄膜进行了微观结构分析，结果表明存在纳米晶体。还采用 AR-XPS 和傅里叶变换红外光谱（FTIR）技术对二氧化钛薄膜进行了表征。提出了适当的成膜机制。此外，对沉积后的二氧化钛薄膜进行的纳米压痕测试表明，它们具有很高的抗机械应力能力。
