Self-assembled Au nanoparticles arrays by porous anodic alumina oxide and optical properties

Using vacuum deposition and subsequent thermal dewetting, Au nanoparticles ordered array were fabricated on the conventional ordered porous alumina template. Here, a self-assembled two-dimensional Au nanoparticles arrays was demonstrated, which consisted of several gold nanoparticles around every hole on the surface of porous alumina template. Furthermore, second anodized and widen diameter time influence on templates formed were investigated. During the fabrication of template, first anodization played guiding role for second anodization, and the diameter of hole direct was proportion with the widen diameter time. It also found that the form of Au nanoparticles arrays depend on the thickness of Au film. At last, optical properties for the material was test. Strong absorption peaks of the UV-visible absorption spectrum due to the surface plasmon resonance of Au nanoparticles were observed.