Macchione M A, Samaniego J E, Moiraghi R, Passarelli N, Macagno V A, Coronado E A, Yacaman M J, Pérez M A
Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Fisicoquímica Av. Haya de la Torre s/n (X5000HUA) Córdoba Argentina
Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC), CONICET Av. Haya de la Torre s/n (X5000HUA) Córdoba Argentina.
RSC Adv. 2018 May 30;8(36):19979-19989. doi: 10.1039/c8ra01032c.
The decomposition of gold hydroxide to give metallic gold is known to take place around 300 °C in dry environments. However, little information about the gold hydroxide stability in wet environments has been recorded. Here, we present experimental evidence which shows that aqueous/water-enriched gold(iii) hydroxide colloids decompose spontaneously to form gold nanoparticles at temperature values above the freezing point of water. Based on this reaction, we developed a method to decorate silica spheres with gold nanoparticles by precipitation and decomposition of gold(iii) hydroxide onto the silica surface in wet media by a simple one-pot/one-step protocol. The silica|gold nanostructures are prepared in high yield and with a low level of by-products.
已知在干燥环境中，氢氧化金分解生成金属金的反应大约在300℃发生。然而，关于氢氧化金在潮湿环境中的稳定性，记录的信息很少。在此，我们提供了实验证据，表明在高于水的冰点的温度下，富含水的氢氧化金（III）水胶体自发分解形成金纳米颗粒。基于此反应，我们开发了一种通过简单的一锅法/一步法协议，在湿介质中将氢氧化金（III）沉淀并分解到二氧化硅表面上，从而用金纳米颗粒装饰二氧化硅球的方法。制备的二氧化硅|金纳米结构产率高且副产物含量低。
