Self-assembly of gold nanorods into symmetric superlattices directed by OH-terminated hexa(ethylene glycol) alkanethiol.
Self-assembly of gold nanorods into symmetric superlattices directed by OH-terminated hexa(ethylene glycol) alkanethiol.
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DOI：
10.1021/la202320k
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发表时间：
2011-08
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影响因子：
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通讯作者：
Yong Xie;Shengmin Guo;Yinglu Ji;Chuanfei Guo;Xinfeng Liu;Ziyu Chen;Xiaochun Wu;Qian Liu
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文献类型：
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作者：
Yong Xie;Shengmin Guo;Yinglu Ji;Chuanfei Guo;Xinfeng Liu;Ziyu Chen;Xiaochun Wu;Qian Liu
各向异性金纳米棒（GNR）自组装成有序相仍然是一个挑战。在这里，我们展示了通过微调GNR之间的排斥相互作用来制造由多层直立GNR组成的对称圆形或半圆形自组装超晶格。通过用OH-封端的六（乙二醇）烷基乙氧基化物（此处称为EG（6）OH，电势为-10 mV）替换十六烷基三甲基溴化铵（CTAB）（电势为20-50 mV）的表面涂层，将排斥力从静电相互作用调整为空间力。通过对主要相互作用的理论分析，讨论了自组装的机理，认为空间排斥和吸引耗尽相互作用之间的有效平衡是自组装的主要驱动力。溶液组装的实时观察（UV-vis-NIR吸收光谱）支持我们提出的机制。这些超晶格不仅丰富了自组装结构的种类，更重要的是加深了对自组装过程的理解，为各种潜在的应用铺平了道路。
The self-assembly of anisotropic gold nanorods (GNRs) into ordered phases remains a challenge. Herein, we demonstrated the fabrication of symmetric circular- or semicircular-like self-assembled superlattices composed of multilayers of standing GNRs by fine-tuning the repulsive interactions among GNRs. The repulsive force is tailored from electrostatic interaction to steric force by replacing the surface coating of cetyltrimethylammonium bromide (CTAB) (ζ potential of 20-50 mV) with an OH-terminated hexa(ethylene glycol) alkanethiol (here termed as EG(6)OH, ζ potential of -10 mV). The assembly mechanism is discussed via theoretical analyses of the major interactions, and an effective balance between the repulsive steric and attractive depletion interactions is the main driving force for the self-assembly. The real-time observations of solution assembly (UV-vis-NIR absorption spectroscopy) supports the mechanism that we suggested. The superlattices obtained here not only enrich the categories of the self-assembled structures but more importantly deepen the insight of the self-assembly process and pave the way for various potential applications.