Thickness dependent morphology of Au and TiO2 and optical study of TiO2 thin films on patterns of self-assembled monolayers
Thickness dependent morphology of Au and TiO2 and optical study of TiO2 thin films on patterns of self-assembled monolayers
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DOI：
10.1016/j.surfcoat.2012.04.073
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发表时间：
2013-09
影响因子：
5.4
通讯作者：
S. Rao;M. Gondal;M. Dastageer
中科院分区：
文献类型：
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作者：
S. Rao;M. Gondal;M. Dastageer
我们报告的形态和光学薄膜（Au和TiO 2）生长在微米级复合自组装单分子膜（SAMs）图案的极性（-COOH，-N）和非极性（-CH 3）分子。广泛的原子力显微镜（AFM）的研究表明，在极性SAM上的沉积膜的顺利生长，而生长的膜最初形成团簇的非极性SAM，但光滑的表面后，实现了几个纳米的膜的生长。光致发光（PL）光谱的二氧化钛的极性和非极性SAM明显依赖于SAM的表面化学和膜的厚度。我们已经观察到的紫外位移以及一个额外的PL峰的厚度的TiO 2膜的减少，这种变化是更加突出的非极性SAM。当在相同条件下在没有SAM的Au表面上生长相同厚度的TiO 2薄膜时，没有观察到这种PL谱的变化。还观察到紫外-红外反射率数据在强度和峰位移方面的变化。这些结果与SAM图案化在微米/纳米尺度上的灵活性可用于创建通用的光学结构。
We report morphology and optical study of thin films (of Au and TiO2) grown on micron scale composite self-assembled monolayers (SAMs) patterns of polar (− COOH, –N) and non-polar (− CH3) molecules. Extensive atomic force microscopy (AFM) study reveals the smooth growth of deposited films on polar SAMs, whereas the grown films initially formed clusters on non-polar SAM but smooth surface is achieved after few nanometer growth of the film. Photoluminescence (PL) spectra of TiO2on polar and non-polar SAMs clearly depend on the surface chemistry of SAM and thickness of the film. We have observed an ultraviolet shift as well as an additional PL peak as the thickness of the TiO2film was decreased and this variation was more prominent on non-polar SAM. Such variation in the PL spectra was not observed when TiO2films of the same thickness were grown on Au surface without the SAM in identical conditions. Variation in UV-IR reflectance data in terms of intensity and peak shift was also observed. These results with the flexibility of SAM patterning at micro-/nano-scale can be used to create versatile optical structures.