Self-assembled structures of polyhedral gold nanocrystals: shape-directive arrangement and structure-dependent plasmonic enhanced characteristics
Self-assembled structures of polyhedral gold nanocrystals: shape-directive arrangement and structure-dependent plasmonic enhanced characteristics
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多面体金纳米晶体的自组装结构：形状定向排列和结构依赖的等离子体增强特性
DOI：
10.1039/c6ra12868h
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发表时间：
2016-06
期刊：
影响因子：
3.9
通讯作者：
Mormile, Pasquale
中科院分区：
文献类型：
--
作者：
Yue-Bun Pun, Edwin;Jiang, Tao;Petti, Lucia;Mormile, Pasquale
采用水热法合成了具有准球形、八面体和三角形形貌的多面体金纳米晶（Au NCs），并通过水滴蒸发诱导沉积形成有序堆积结构。多面体Au纳米粒子的自组装结构在积木块取向过程中呈现形状定向排列，并利用有限元法（FEM）数值分析了自组装纳米粒子的结构依赖等离子体特性.以4-巯基苯甲酸为拉曼报告分子，在785 nm激发波长下，测量了自组装结构的表面增强拉曼散射（Sers）光谱。理论和实验结果均表明，多面体Au纳米粒子的自组装结构具有较高的电场增强和优异的Sers性能，特别是八面体自组装结构比其他密排结构产生更高的等离子体增强效率。这种上级的表面增强Sers行为可以通过间隙热点的电磁增强机制和等离子体天线效应来解释，证实了多面体Au纳米粒子的自组装结构为等离子体增强基底的设计提供了一种新的途径，在生物传感和医学检测方面具有潜在的应用前景。
Polyhedral gold nanocrystals (Au NCs) with quasi-spherical, octahedral and triangle-like morphologies were synthesized using a hydrothermal method, and ordered packing structures were formed by water droplet evaporation-induced deposition. The self-assembled structures of the polyhedral Au NCs exhibit shape-directive arrangement during the building block orientation process, and the structure-dependent plasmonic characteristics of the self-assembled NCs were analysed numerically using the finite element method (FEM). The surface-enhanced Raman scattering (SERS) spectra of the self-assembled structures were measured by choosing 4-mercaptobenzoic acid as the Raman reporter, using an excitation wavelength of 785 nm. Both the theoretical and experimental results show that the self-assembled structures of polyhedral Au NCs have high electric field enhancements and excellent SERS performances, in particular, the octahedron self-assembled structures generate higher plasmonic enhancemence efficiency compared to other close-packed configurations. The superior SERS behaviours can be explained based on the electromagnetic enhancement mechanism and the plasmonic antenna effect of the interstitial hot spots, confirming that the self-assembly structures of polyhedral Au NCs offer an alternate way in the design of plasmonic enhancement substrates, with potential applications in bio-sensing and medical detection.
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影响因子：
15
作者：
Nakagawa, Yoshitaka;Kageyama, Hiroyuki;Imai, Hiroaki
通讯作者：
Imai, Hiroaki
影响因子：
7
作者：
Hamon C;Novikov SM;Scarabelli L;Solís DM;Altantzis T;Bals S;Taboada JM;Obelleiro F;Liz-Marzán LM
通讯作者：
Liz-Marzán LM
DOI：
10.1073/pnas.1016530108
发表时间：
2011-05-17
影响因子：
11.1
作者：
Alvarez-Puebla, Ramon A.;Agarwal, Ashish;Liz-Marzan, Luis M.
通讯作者：
Liz-Marzan, Luis M.
影响因子：
9
作者：
S. Gómez‐Graña;J. Pérez‐Juste;R. Álvarez-Puebla;A. Guerrero‐Martínez;L. Liz‐Marzán
通讯作者：
S. Gómez‐Graña;J. Pérez‐Juste;R. Álvarez-Puebla;A. Guerrero‐Martínez;L. Liz‐Marzán
影响因子：
13.3
作者：
Weikun Li;Ke Wang;Peng Zhang;Jie He;Shaoyi Xu;Yonggui Liao;Jintao Zhu;Xiaolin Xie;Z. Nie
通讯作者：
Weikun Li;Ke Wang;Peng Zhang;Jie He;Shaoyi Xu;Yonggui Liao;Jintao Zhu;Xiaolin Xie;Z. Nie