表面嵌套型结构多孔氧化铝薄膜的制备及表征

Preparation and characterization of porous alumina film with special nested structure on surface

多孔氧化铝微结构的调控对其光学性能有着重要的影响。通过改进传统两步氧化法制备出表面具有嵌套型结构的多孔氧化铝薄膜。实验结果表明,当第1次氧化条件不同于第2次氧化条件时,其表面呈现两种不同孔洞,孔间距分别为100和270nm,微观形态会以嵌套型结构的形式出现;而当两次氧化的条件相同时,表面形态为单一孔。对两种多孔氧化铝薄膜分别建立了孔洞生长模型,并进行了理论分析。UV-Vis反射光谱图测试结果表明多孔氧化铝薄膜表面孔隙率大的样品会出现蓝移现象。此研究提出了一种新的思路来制备具有特殊表面形态的多孔氧化铝薄膜,且因其结构的特殊性和明亮纯净的颜色,其在压印工艺,装饰和防伪技术上都有着很大的应用价值。

The microstructure of porous anodic alumina has an important effect on its optical properties.The porous anodic alumina thin films with special nested structure on the surface were prepared by improving the traditional two-step anodization method.The experimental results show that when the first anodization condition is different from the second one,the surface presents two different holes.The interpore distances are 100 and 270 nm respectively,and the microstructure appears in the form of a special nested structure.When the anodization conditions are the same,the surface morphology is a single hole.The pore growth model was established for two kinds of porous anodic alumina thin films,and the theoretical analysis was carried out.UV-Vis reflectance spectroscopy shows that there is blue-shifted in the porous anodic alumina thin films with large porosity on the surface.This study presents a new idea to prepare porous anodic alumina thin films with special surface morphology.The special porous anodic alumina thin films can be used in many areas,including coining process decoration and anti-counterfeiting applications,because of the particularity of their structure and the bright and pure color.