Preparation Of Gold Nanoparticle Arrays And Optical Properties

In this article, we use vacuum deposition and subsequently thermal dewetting, gold nano-particles ordered array were fabricated on the conventional ordered porous alumina template(AAO). Furthermore, we test the morphology characterization and optical absorption spectra of these nanostructures. They exhibit excellent optical performance. Include the following contents.Controllable preparation of AAO template. In order to meet the requirements of the assembly of gold nanoparticles, we achieved the controllable preparation of hole array, aperture and hole depth by changing anodizing technology, choose appropriate time of widen-pore and control of secondary processes.Preparation of AAO template-assembled array of gold nanoparticles composites.(1) By the regulation of AAO template structure, we obtained AAO Surface-Assembly gold nano-particles ordered array nanostructure;(2) we use the AAO template pore structure assembled ordered arrays of gold nanoparticles. We obtained Hole-Assembly gold nanoparticles ordered array nanostructure;(3) we obtained "Nano hexagon crown nanostructure", which contain Surface-Assembly gold nanoparticles ordered array and Hole-Assembly gold nano-particles ordered array at the same time.The plasma absorption properties of gold nanoparticles assembled array composites based on AAO template.For the AAO Surface-Assembly gold nanoparticles ordered array, there are significant absorption peak absorption peaks in the visible range. For the Hole-Assembly gold nanoparticles ordered array, the absorption peak position remains in the500-550nm band. The absorption spectrum simulation of Hole-Assembly gold nanoparticles ordered array based on M-G theory is shown that experimental results is close to simulation. Then we research the influence of that gold particle size, wall thickness gold nanoparticle aspect ratio on the plasmon resonance absorption; The "Nano-Hexagon crown" nanostructure absorption spectrum shown double absorption peaks in visible range. we characterize surface enhanced raman spectrum of Surface-Assembly gold nanoparticles ordered array nanostructure. The nanostructure was used as substrate material. The contrast substrate is silicon coated gold film. After the characterization of Raman spectrum, the result demonstrate that Raman scattering spectra intensity of Surface-Assembly gold nanoparticles ordered array composite is Significantly better than the contrast material.