一种自支撑金纳米薄膜的制备、结构和氮吸附特性

以一种新的硅微米/纳米结构复合体系——硅纳米孔柱阵列作为还原性衬底，采用浸渍技术制备出一种自支撑的金纳米薄膜，并对其表面形貌和结构进行了表征.实验表明，金纳米薄膜的制备过程是一个自终止过程.当硅纳米孔柱阵列被耗尽后，浸渍溶液中Au³⁺的还原反应将自行终止；同时，所形成的金纳米薄膜自动与衬底脱离并成为一种自支撑薄膜.薄膜的形成机理被归因于硅纳米孔柱阵列所具有的高的表面活性和还原性.用能量弥散x射线谱对薄膜表面化学成分分析的结果表明，如此制备的金纳米薄膜具有很强的氮吸附和氮储存能力.这一特性有可能在气体传感器、空气分离和氮纯化以及氮化合物的膜合成器等技术领域得到应用.关键词：自支撑金纳米薄膜硅纳米孔柱阵列浸渍技术

Preparation, structural characterization and nitrogen adsorption properties of a self-supported nanostructured gold film

Employing silicon nanoporous pillar array (Si-NPA), a novel silicon micron/nanometer complex systems as reducing substrate, a self-supported, nanostructured gold film was prepared by immersion technique. The microstructure and surface morphology of the film were characterized. Our experiments disclosed that the preparation of the film is a self-stop process. With the exhaustion of Si-NPA, the chemical reducing reaction related with the Au³⁺ ions occurring in the immersing solution would stop automatically, and the deposited nanostructured gold film would disengage from the substrate to form a self-supported thin film. The formation mechanism of the film is due to the high surface reactivity and strong chemical reducibility of Si-NPA. The elemental composition analysis by energy dispersive x-ray spectroscopy showed that the prepared gold film exhibits strong capability in nitrogen adsorption and storage, which may find potential applications in the technical fields of gas sensors, air separation, nitrogen purification and membrane synthesis of various nitrides.