尖端对尖端配置超晶格中等离子体八面体纳米颗粒三维超晶体中的系综热点

IF 15.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Jeongwon Kim, Qiang Zhao, Inyoung Choi, Myeong Jin Oh, Sunwoo Kwon, Sungho Park
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引用次数: 0

摘要

纳米粒子组装为利用粒子间的物理化学相互作用提供了前景广阔的策略。尽管纳米粒子组装具有促进光-物质相互作用的潜力,但以尖端到尖端的方式实现纳米粒子组装仍是一项重大挑战。在这里,我们展示了一种将金八面体纳米粒子组织成独特的三维直立上层结构的合成过程,其中尖尖的尖端朝向邻近的纳米粒子,以促进在这些顶点增强近场聚焦。这种排列方式被称为 "避雷针耦合效应",有利于以 "超级粉末 "的形式生产,它像粉末一样表现出广泛的组装顺序。这种顶端到顶端的排列--直立八面体超晶格--偏离了自然堆积原理,在优化顶点近场聚焦的同时,保持了持续的高孔隙率,使吸附剂能够深入渗透。这种构造有利于实现气态分子的表面增强拉曼散射,同时减少背景荧光信号,特别是在高强度激光激发下,这是传统表面增强拉曼散射技术所面临的挑战。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ensemble hot-spots in 3D supercrystals of plasmonic octahedral nanoparticles in tip-to-tip configured superlattices

Ensemble hot-spots in 3D supercrystals of plasmonic octahedral nanoparticles in tip-to-tip configured superlattices

Nanoparticle assembly offers promising strategy for harnessing the physicochemical interparticle interactions. Despite its potential for boosting light-matter interaction, achieving nanoparticle assembly with tip-to-tip manner remains a significant challenge. Here we show a synthetic procedure for organizing gold octahedral nanoparticles into a distinct three-dimensional upright superstructure, where the pointed tips are oriented toward neighboring nanoparticles to promote enhanced near-field focusing at these apexes. This arrangement, referred to as the “coupling of the lightning rod effect”, facilitates production in the form of “superpowder”, which exhibits an extensive assembly order like a powder. Deviating from natural packing principles, this tip-to-tip alignment—the upright octahedral superlattice—optimizes near-field focusing on its vertices while maintaining consistently high porosity, allowing for deep penetration of adsorbates. This configuration is advantageous for enabling surface-enhanced Raman scattering of gaseous molecules with reduced background fluorescence signals, particularly under high-intensity laser excitation, a challenging feat with conventional surface-enhanced Raman scattering techniques.

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来源期刊
Nature Communications
Nature Communications Biological Science Disciplines-
CiteScore
24.90
自引率
2.40%
发文量
6928
审稿时长
3.7 months
期刊介绍: Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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