Song C Y, Yang B Y, Chen W Q, Dou Y X, Yang Y J, Zhou N, Wang L H
Key Lab for Organic Electronics & Information Displays (KLOEID), Institute of Advanced Materials (IAM), Synergetic Innovation Center for Organic Electronics and Information Displays, Nanjing University of Posts & Telecommunications, Nanjing 210023, China.
J Mater Chem B. 2016 Nov 28;4(44):7112-7118. doi: 10.1039/c6tb01046f. Epub 2016 Oct 18.
So far only a few approaches have been reported for the successful synthesis of 3D flower-like hierarchical gold nanostructures. In this paper, a facile, seedless and one-pot approach to synthesize a new class of flower-shaped gold nanoparticles with sheet-like petals has been proposed by reduction of HAuCl with ascorbic acid in (1-hexadecyl)trimethylammonium chloride solution, in the presence of silver nitrate (AgNO). The growth of petals can be controlled and tuned by adjusting the amount of silver nitrate in the growth solution, and the reaction progress and evolution of the petals were monitored by time-course measurements via UV-vis-NIR spectroscopy and SEM to observe the growth mechanisms of nanoparticles. Besides, their optical properties, especially SERS performances, were also studied. These SERS-active gold nanoparticles were further utilized in the design of bright SERS tags for selectively in vitro imaging cancer cells. The results indicate that these Au NFs can be used as good SERS substrates or to design sensitive SERS sensors.
到目前为止，仅有少数几种方法被报道用于成功合成三维花状分级金纳米结构。本文提出了一种简便、无籽且一锅法的方法，即在（十六烷基）三甲基氯化铵溶液中，在硝酸银（AgNO）存在的情况下，通过抗坏血酸还原氯金酸来合成一类具有片状花瓣的新型花状金纳米颗粒。通过调节生长溶液中硝酸银的量，可以控制和调整花瓣的生长，并且通过紫外-可见-近红外光谱和扫描电子显微镜的时间进程测量来监测花瓣的反应进程和演变，以观察纳米颗粒的生长机制。此外，还研究了它们的光学性质，特别是表面增强拉曼散射（SERS）性能。这些具有SERS活性的金纳米颗粒进一步用于设计用于选择性体外成像癌细胞的明亮SERS标签。结果表明，这些金纳米花可以用作良好的SERS基底或设计灵敏的SERS传感器。
