模板沉积-去合金化法制备块体泡沫金

Preparation of Monolithic Foamed Gold by a Template Deposit-Dealloying Method

摘要:

在聚苯乙烯微球表面直接镀覆具有自支撑金层的基础上，结合去合金化工艺成功制备出双模式孔径分布的块体泡沫金样品，建立模板沉积-去合金化法制备超低密度泡沫金的工艺方法，并对其制备工艺进行研究。研究表明：化学镀金后PS微球表面的金沉积层厚度为70～90 nm；在Au/PS表面进行化学镀银后镀覆层厚度增至200~400 nm；模板去除后，获得了完全自支撑的Au40Ag60金银合金空心微球结构泡沫；去合金化干燥后，样品由约10 μm的空心球壳和平均系带尺寸47 nm的双连续结构纳米多孔球壳层的双模式孔隙形貌组成，并且由于去合金化形成的纳米多孔球壳层，样品的密度进一步减小至0.8 g/cm3

Abstract:

The monolithic foamed gold was synthesized by a template deposit-dealloying method with polystyrene (PS) template and gold silver electroless depositing and dealloying. The results indicate that the deposited gold has the thickness of 70~90 nm, and the deposited Au/Ag has the thickness of 200~400 nm after silver electroless depositing on the surface of Au/PS. The self-supported hollow spheres Au40Ag60 alloy was obtained after the template removed. The ultra-low-density gold monoliths with multimodal pore structure, hollow spheres of about 10 μm, and density of 0.8 g/cm3 was obtained after dealloying heat treatment