用于SERS传感和多相催化的通过模板化电流位移反应获得的3D金纳米枝晶层的评价
Evaluation of 3D gold nanodendrite layers obtained by templated galvanic displacement reactions for SERS sensing and heterogeneous catalysis
摘要：
重叠的三维（3D）金纳米枝晶的致密层的特征在于高比表面积以及丰富的尖锐边缘和顶点，从而产生高密度的SERS热点，是用于基于SERS的传感和催化的有前途的基底。我们已经评估了3D金纳米枝晶层的结构特征可以在多大程度上通过在合理定位在硅晶片上的金颗粒处开始3D金纳米枝晶生长来优化。为了这个目的，产生3D金纳米枝晶的电流位移反应由具有1.5微米的晶格常数的母体金颗粒的六边形阵列引导，所述母体金颗粒通过在形貌图案化的硅晶片上的金的固态去湿获得。在金颗粒的边缘处的树枝状特征的生长的起始导致3D金纳米枝晶的形成，同时防止树枝状生长到衬底平面的限制。母金颗粒的规则排列支持重叠的3D金纳米枝晶的致密层的形成，所述3D金纳米枝晶在拉曼显微镜的分辨率极限内足够均匀。因此，SERS映射实验揭示了合理程度的均匀性。所提出的制备算法仅包括自下而上的工艺步骤，其可以在不使用昂贵的仪器的情况下进行。
英文摘要：
Dense layers of overlapping three-dimensional (3D) gold nanodendrites characterized by high specific surfaces as well as by abundance of sharp edges and vertices creating high densities of SERS hotspots are promising substrates for SERS-based sensing and catalysis. We have evaluated to what extent structural features of 3D gold nanodendrite layers can be optimized by the initiation of 3D gold nanodendrite growth at gold particles rationally positioned on silicon wafers. For this purpose, galvanic displacement reactions yielding 3D gold nanodendrites were guided by hexagonal arrays of parent gold particles with a lattice constant of 1.5 micrometers obtained by solid-state dewetting of gold on topographically patterned silicon wafers. Initiation of the growth of dendritic features at edges of the gold particles resulted in the formation of 3D gold nanodendrites while limitation of dendritic growth to the substrate plane was prevented. The regular arrangement of the parent gold particles supported the formation of dense layers of overlapping 3D gold nanodendrites that were sufficiently homogeneous within the resolution limits of Raman microscopes. Consequently, SERS mapping experiments revealed a reasonable degree of uniformity. The proposed preparation algorithm comprises only bottom-up process steps that can be carried out without use of costly instrumentation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
