Department of Chemistry and Protein Research Center for Bio-Industry, Hankuk University of Foreign Studies, Yongin 449-791, Korea.
ACS Appl Mater Interfaces. 2013 Feb;5(4):1429-35. doi: 10.1021/am302865b. Epub 2013 Feb 5.
Rosette-like nanoscale Au materials were simply prepared through one-pot reduction of the AuCl₄⁻ precursor by 2-thiopheneacetic acid (2-TAA) without extra surface capping ligands at room temperature. 2-TAA underwent polymerization into polythiophene derivatives while the AuCl₄⁻ precursor was simultaneously reduced into various Au nanostructures. In situ generated polythiophene derivatives played a significant role of surface passivation in guiding the shape of Au nanostructures. The morphology of Au nanostructures was strongly dependent on the molar ratio of 2-TAA to AuCl₄⁻. At lower [2-TAA]/[AuCl₄⁻] ratios, uniform rosette-like Au microparticles consisting of 30-nm-thick Au nanoplates were observed. The Au nanoplates had either triangular prismatic or hexagonal geometry with many defects. Uniform Au nanorosettes could be easily deposited on the Si substrate by drop-casting and were subsequently used as highly active SERS substrates for the detection of methylene blue and crystal violet by Raman spectroscopy. Upon increasing the ratio of [2-TAA]/[AuCl₄⁻], Au nanoparticles or nanorods heavily surrounded with polythiophene polymers were obtained.
通过将金氯（AuCl4-）前体在室温下由 2-噻吩乙酸（2-TAA）一锅还原，简单制备了类玫瑰花纳米级 Au 材料，无需额外的表面封端配体。2-TAA 聚合形成聚噻吩衍生物，同时 AuCl4-前体被还原成各种 Au 纳米结构。原位生成的聚噻吩衍生物在引导 Au 纳米结构的形状方面起着重要的表面钝化作用。Au 纳米结构的形态强烈依赖于 2-TAA 与 AuCl4-的摩尔比。在较低的[2-TAA]/[AuCl4-]比例下，观察到由 30nm 厚的 Au 纳米板组成的均匀类玫瑰花 Au 微米粒子。Au 纳米板具有三角形棱柱或六边形几何形状，具有许多缺陷。通过滴铸法可以在 Si 衬底上轻松沉积均匀的 Au 纳米玫瑰花，并随后用作拉曼光谱检测亚甲基蓝和结晶紫的高活性 SERS 基底。随着[2-TAA]/[AuCl4-]比例的增加，获得了大量被聚噻吩聚合物严重包围的 Au 纳米颗粒或纳米棒。
