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首页> 外文会议>Plasmonics in biology and medicine XII >Monolithic nanoporous gold disks with large surface area and high-density plasmonic hot-spots
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Monolithic nanoporous gold disks with large surface area and high-density plasmonic hot-spots

机译：具有大表面积和高密度等离子体热点的整体式纳米多孔金盘

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Plasmonic metal nanostructures have shown great potential in sensing, photovoltaics, imaging and biomedicine, principally due to enhancement of the local electric field by light-excited surface plasmons, the collective oscillation of conduction band electrons. Thin films of nanoporous gold have received a great deal of interest due to the unique 3-dimensional bicontinuous nanostructures with high specific surface area. However, in the form of semi-infinite thin films, nanoporous gold exhibits weak plasmonic extinction and little tunability in the plasmon resonance, because the pore size is much smaller than the wavelength of light. Here we show that by making nanoporous gold in the form of disks of sub-wavelength diameter and sub.1-00 nm thickness, these limitations can be overcome. Nanoporous gold disks (NPGDs) not only possess large specific surface area but also high-density, internal plasmonic "hot-spots" with impressive electric field enhancement, which greatly promotes plasmon-matter interaction as evidenced by spectral shifts in the surface plasmon resonance. In addition, the plasmonic resonance of NPGD can be easily tuned from 900 to 1850 nm by changing the disk diameter from 300 to 700 nm. The coupling between external and internal nano-architecture provides a potential design dimension for plasmonic engineering. The synergy of large specific surface area, high-density hot spots, and tunable plasmonics would profoundly impact applications where plasmonic nanoparticles and non-plasmonic mesoporous nanoparticles are currently employed, e.g., in in-vitro and in-vivo biosensing, molecular imaging, photothermal contrast agents, and molecular cargos.
机译：等离子体金属纳米结构在传感，光伏，成像和生物医学领域已显示出巨大的潜力，这主要归因于光激发的表面等离子体激元增强了局部电场，导带电子的集体振荡。纳米多孔金薄膜由于具有高比表面积的独特的3维双连续纳米结构而受到了广泛的关注。然而，以半无限薄膜的形式，纳米孔金表现出弱的等离子体消光性，并且在等离子体激元共振中几乎没有可调性，这是因为孔的尺寸远小于光的波长。在这里，我们表明，通过以亚波长直径和小于1.00 nm厚度的圆盘形式制备纳米多孔金，可以克服这些限制。纳米多孔金盘（NPGDs）不仅具有较大的比表面积，而且具有高密度的内部等离激元“热点”，并具有令人印象深刻的电场增强作用，这极大地促进了等离激元与物质之间的相互作用，如表面等离激元共振的光谱移动所证明的那样。此外，通过将圆盘直径从300 nm更改为700 nm，可以轻松地将NPGD的等离子体共振从900调整为1850 nm。外部和内部纳米体系结构之间的耦合为等离子体工程提供了潜在的设计维度。大比表面积，高密度热点和可调等离子体的协同作用将深刻影响目前使用等离子体纳米颗粒和非等离子体介孔纳米颗粒的应用，例如，在体外和体内生物传感，分子成像，光热学中造影剂和分子货物。

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