介孔氧化铝组装金纳米颗粒阵列及其光学性质(英文)

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

采用真空蒸镀的方法在多孔氧化铝模板表面得到薄金膜,随后在真空管式炉中进行热处理,热处理中发生的热去湿过程使得金膜在多孔氧化铝表面形成有序的金纳米颗粒阵列。同时还研究了多孔氧化铝模板制备过程中二次氧化的作用,发现一次氧化对二次氧化进行具有一定指导作用;另外,研究了扩孔时间对模板孔径的影响,一定条件下,扩孔时间与孔径成正比例关系;最后研究了镀膜厚度对金纳米颗粒的影响,结果中可以看到,金膜的厚度直接影响金纳米颗粒阵列的形成。最后在分光光度计上的光学测量吸收光谱的结果中,出现了表面等离子体作用引起的很强的吸收峰。

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.