Biotemplate-assisted manufacturing of silica nanowire assemblies

本研究项目结合了分子自底向上的一维陶瓷纳米线定向成核技术和自上而下的介观材料软光刻图案化策略。利用溶胶-凝胶途径和溶液扩散控制成核，二氧化硅纳米线将在分子溶解多糖生物模板上形成陶瓷前体的各向异性成核。生物聚合物的化学功能和分子形状用于指导结构的形成。化学基团可以从阳离子、极性或疏水性到阴离子变化。多糖将根据聚合程度进行调整，聚合程度决定了所得纳米线的长度。分子形状可以根据糖单元之间键的化学构型来设计。在一个联合程序中，二氧化硅纳米线将使用软光刻技术（即毛细力光刻）组装成纳米级光子器件。先进的技术将用于表征材料（HR-TEM， EDS， AFM， XPS）和光学（椭偏，干涉仪，傅里叶红外显微镜）性质。定向二氧化硅纳米线的潜在应用是相干红外束作为波导，用于4微米（4微米）以上的低损耗红外传输。

This research project combines the molecular bottom-up technique for oriented nucleation of one dimensional ceramic nanowires together with the top-down strategy of patterning mesoscopic materials using soft lithographic methods. Silica nanowires will be anisotropi-cally nucleated form ceramic precursors on the molecular dissolved polysaccharide biotem-plates applying sol-gel routes and diffusion controlled nucleation from solution. The chemical functions as well as the molecular shape of the biopolymers are used for directing structure formation. The chemical groups can be varied from cationic, via polar or hydrophobic to ani-onic. The polysaccharides will be adjusted in respect to the degree of polymerisation which defines the length of the resulting nanowires. The molecular shape can be designed according to the chemical configuration of the bonds between the saccharide units. In a combined pro-cedure, the silica nanowires will be assembled into a nanoscale photonic device using soft lithographic techniques, i.e. capillary force lithography. Advanced techniques will be used to characterise the material (HR-TEM, EDS, AFM, XPS) and optical (ellipsometry, interferome-try, FTIR-microscopy) properties. Potential application of aligned silica nanowires are coher-ent IR-bundles as waveguides for low-loss IR transmission beyond four microns (4 µm).