Morphology, dimension, size, and surface chemistry of gold nanoparticles are critically important in determining their optical, catalytic, and photothermal properties. Although many techniques have been developed to synthesize various gold nanostructures, complicated and multistep procedures are required to generate three-dimensional, dendritic gold nanostructures. Here, we present a simple method to synthesize highly branched gold nanodendrites through the well-controlled reduction of gold ions complexed with a catechol-grafted polymer. Dextran grafted with catechols guides the morphological evolution as a polymeric ligand to generate dendritic gold structures through the interconnection of the spherical gold nanoparticles. The reduction kinetics, which is critical for morphological changes, is controllable using dimethylacetamide, which can decrease the metal–ligand dissociation and gold ion diffusivity. This study suggests that mussel-inspired polymer chemistry provides a simple one-pot synthetic route to colloidal gold nanodendrites that are potentially applicable to biosensing and catalysis.

中文翻译：

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使用邻苯二酚接枝的聚合物模板将金纳米颗粒形态演变为纳米树枝状晶体

金纳米颗粒的形态，尺寸，大小和表面化学性质对于确定其光学，催化和光热性能至关重要。尽管已经开发了许多技术来合成各种金纳米结构，但是需要复杂且多步骤的程序来生成三维树枝状金纳米结构。在这里，我们提出了一种简单的方法，可以通过对与邻苯二酚接枝的聚合物络合的金离子进行可控的还原来合成高度支化的金纳米树枝状晶体。用儿茶酚接枝的右旋糖酐作为聚合配体引导形态演变，以通过球形金纳米粒子的相互连接生成树突状金结构。还原动力学（对于形态变化至关重要）可以使用二甲基乙酰胺控制，这可以降低金属-配体的离解和金离子的扩散率。这项研究表明，贻贝启发的聚合物化学为胶体金纳米树突提供了一种简单的一锅合成路线，该路线可能适用于生物传感和催化。