金纳米颗粒自组装膜的制备及其性能

采用一种简单的两步两相法合成了单分散性十二硫醇包裹金纳米颗粒（DDT AuNPs，直径约为10 nm），以硅片、玻璃片等为基底，利用浸渍提拉法制备了金纳米颗粒(AuNPs)自组装膜.通过扫描电子显微镜（SEM）、紫外 可见光（UV-vis）光谱等表征手段研究了自组装膜的表面形貌以及表面等离子体共振特征，以一氧化碳（CO）低温氧化做为模型反应研究了其催化性能.研究表明，利用该方法制备的AuNPs自组装薄膜具有表面等离子体共振性能，有望被用于化学和生物传感方面.同时，这种薄膜在催化领域具有潜在的应用前景.

Preparation of Self-assembled Au Nanoparticles and Its Properties

Dodecanethiol(DDT) passivated monodispersed Au nanoparticles (AuNPs) have been synthesized by using a combination of citrate reduction method and the Brust and schiffrin method（Two step-Two phase method）. The DDT-AuNPs can be easily adsorbed onto some substrates (silicon or glass) to form a thin film by using the dip coating method. The chemical composition and surface morphology of modified substrates were investigated by means of SEM. The optical properties were studied using UV-vis spectrum. The result indicated that the AuNPs can form a close-packed arrangement with a number of controlled plasma resonance effect and catalytic activity for CO oxidation at room temperature. It suggests that the film prepared by this method can be used extensively in chemistry biosensing and catalysis area.