金纳米颗粒的水相法合成及荧光性能

在水溶液中,以PAMAM树形分子为模板,乙醇为还原剂,制备了树形分子包裹的金纳米颗粒,其水溶性好,可以稳定放置1年以上;通过控制Au3+与PAMAM树形分子的摩尔比,可以得到粒径可控的金纳米颗粒,其粒径范围为1～4nm,分别在385和402nm处出现强的共振瑞利光散射峰和荧光峰.室温下,荧光量子产率达到10%以上,比其它文献报道的金纳米颗粒的荧光量子产率高2个数量级以上,这一特性使其在潜指纹识别、光催化等方面具有很大的应用潜力.

Gold Nanoparticles Prepared by Aqueous Synthesis and Its Fluorescence Properties

Au nanoparticles encapsulated by PAMAM dendrimers were prepared using PAMAM dendrimers as template and ethanol as reducing agent in water medium, respectively, which have good water-solubility and well-stability in water phase for more than 1 year. Au nanoparticles with controlled size in a range of 1—4 nm were obtained by changing the molar ratio of Au3+ to PAMAM dendrimers. The results show that there was a strong resonance Rayleigh scattering peak at 385 nm and a fluorescence peak at 402 nm. The photoluminescence quantum yield of the prepared Au nanoparticles was more than 10% at room temperature, which is about 2 orders of magnitude higher than that of Au nanoparticles prepared by other methods, so it have potential application prospect in fingerprint recognition, photocatalysis and so on.