Liu B, Xie J, Lee J Y, Ting Y P, Chen J Paul
Singapore-MIT Alliance, and Department of Chemical & Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore.
J Phys Chem B. 2005 Aug 18;109(32):15256-63. doi: 10.1021/jp051449n.
In this work, single-crystalline gold nanoplates were obtained by reducing aqueous chloroauric acid solution with the extract of Sargassum sp. (brown seaweed) at room temperature. The gold nanoplates so obtained were characterized by UV-vis spectroscopy, X-ray diffraction, atomic force microscopy, and transmission electron microscopy. The formation of gold nanoplates was found to depend on a number of environmental factors, such as the time taken to age the seaweed extract, pH of the reaction medium, reaction temperature, reaction time, and initial reactant concentrations. The size of the gold nanoplates could be controlled to between 200 and 800 nm by manipulating the initial reactant concentrations. The yield of the flat gold nanocrystals relative to the total number of nanoparticles formed was as high as approximately 80-90%.
在这项工作中，通过在室温下用马尾藻属（褐藻）提取物还原氯金酸水溶液获得了单晶金纳米片。对如此获得的金纳米片进行了紫外可见光谱、X射线衍射、原子力显微镜和透射电子显微镜表征。发现金纳米片的形成取决于许多环境因素，如海藻提取物老化所需时间、反应介质的pH值、反应温度、反应时间和初始反应物浓度。通过控制初始反应物浓度，可将金纳米片的尺寸控制在200至800纳米之间。相对于形成的纳米颗粒总数，扁平金纳米晶体的产率高达约80 - 90%。
