双子型两亲分子诱导金纳米花的囊泡组装及其间隔基对形貌和光学性质的调控

Vesicle-directed generation of gold nanoflowers by gemini amphiphiles and the spacer-controlled morphology and optical property.

机构信息

Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, PR China.

出版信息

Langmuir. 2010 Apr 20;26(8):5876-81. doi: 10.1021/la903809k.

DOI:10.1021/la903809k

PMID:20000437

Abstract

In this article, we developed an effective approach to generate gold nanoflowers (AuNFs) by vesicles made from a series of gemini amphiphiles (G2-G10) with different spacer lengths. The gemini amphiphiles were found to form vesicles in aqueous solution. Upon mixing with vesicles in the presence of AgNO(3), HAuCl(4) could be reduced into gold nanoflowers by ascorbic acid. The vesicles directed the growth of the AuNFs, and the spacer length of the gemini amphiphiles showed obvious control of the morphology and optical properties of the formed AuNFs. At a lower HAuCl(4) concentration, the minimum-sized AuNFs were formed when vesicles from the amphiphile with a spacer length of 4 were applied. Upon increasing the spacer length, branched nanoflowers are predominantly produced. A seed-growth mechanism together with the conformational change of the spacer of the gemini amphiphiles was proposed according to the studies on reaction processes. In addition, the formed gold nanoflowers showed obvious surface-enhanced Raman scattering activity for R6G. The present method provided an efficient, controllable way to synthesize branched gold nanostructures.

摘要

在本文中，我们开发了一种有效的方法，通过一系列具有不同间隔长度的双子型两亲物（G2-G10）制成的囊泡来生成金纳米花（AuNFs）。发现双子型两亲物在水溶液中形成囊泡。在存在 AgNO3 的情况下与囊泡混合时，抗坏血酸可将 HAuCl4 还原为金纳米花。囊泡指导 AuNFs 的生长，并且双子型两亲物的间隔长度对形成的 AuNFs 的形态和光学性质表现出明显的控制作用。在较低的 HAuCl4 浓度下，当使用间隔长度为 4 的两亲物的囊泡时，形成最小尺寸的 AuNFs。随着间隔长度的增加，主要生成支化纳米花。根据反应过程的研究，提出了一种种子生长机制以及双子型两亲物间隔的构象变化。此外，形成的金纳米花对 R6G 表现出明显的表面增强拉曼散射活性。本方法为合成支化金纳米结构提供了一种高效、可控的方法。