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首页> 外文期刊>Advanced Functional Materials >Dna-Directed Self-Assembly of Core-Satellite Plasmonic Nanostructures: A Highly Sensitive and Reproducible Near-IR SERS Sensor
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Dna-Directed Self-Assembly of Core-Satellite Plasmonic Nanostructures: A Highly Sensitive and Reproducible Near-IR SERS Sensor

机译：Dna定向的核等离子等离子体纳米结构的自组装：一种高灵敏度和可重现的近红外SERS传感器。

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摘要

The excitation of surface plasmons in metallic nanostructures provides an opportunity to localize light at the nanoscale, well below the scale of the wave­length of the light. The high local electromagnetic field intensities generated in the vicinity of the nanostructures through this nanofocusing effect are exploited in surface enhanced Raman spectroscopy (SERS). At narrow interparticle gaps, so-called hot-spots, the nanofocusing effect is particularly pronounced. Hence, the engineering of substrates with a consistently high density of hot-spots is a major challenge in the field of SERS. Here, a simple bottom-up approach is described for the fabrication of highly SERS-active gold core-satellite nanostruc­tures, using electrostatic and DNA-directed self-assembly. It is demonstrated that well-defined core-satellite gold nanostructures can be fabricated without the need for expensive direct-write nanolithography tools such as electron-beam lithography (EBL). Self-assembly also provides excellent control over particle distances on the nanoscale. The as-fabricated core-satellite nanostructures exhibit SERS activities that are superior to commercial SERS substrates in signal intensity and reproducibility. This also highlights the potential of bottom-up self-assembly strategies for the fabrication of complex, well-defined functional nanostructures with future applications well beyond the field of sensing.
机译：金属纳米结构中表面等离子体激元的激发提供了将光定位在纳米尺度上的机会，该尺度远低于光的波长尺度。在表面增强拉曼光谱（SERS）中利用了通过这种纳米聚焦效应在纳米结构附近产生的高局部电磁场强度。在窄的颗粒间间隙，即所谓的热点处，纳米聚焦效应特别明显。因此，具有恒定高热点密度的基板的工程设计是SERS领域的主要挑战。在这里，描述了一种简单的自下而上的方法，该方法使用静电和DNA定向自组装技术来制造具有高度SERS活性的金核-卫星纳米结构。事实证明，无需昂贵的直接写入纳米光刻工具（如电子束光刻（EBL）），即可制造出轮廓分明的核心卫星金纳米结构。自组装还提供了对纳米级粒子距离的出色控制。制成的核心卫星纳米结构显示出SERS活性，其信号强度和可再现性优于商业SERS基质。这也凸显了自底向上自组装策略在制造复杂的，定义明确的功能纳米结构方面的潜力，其未来的应用远远超出了传感领域。

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  • 来源
    《Advanced Functional Materials》 |2013年第12期|1519-1526|共8页
  • 作者

    Yuanhui Zheng; Thibaut Thai; Philipp Reineck; Ling Qiu; Yueming Quo; Udo Bach;

  • 作者单位

    Department of Materials Engineering Monash University Wellington Road, Clayton, Victoria 3800, Australia,The Melbourne Centre for Nanofabrication 151 Wellington Road, Clayton, Victoria 3168, Australia;

    Department of Materials Engineering Monash University Wellington Road, Clayton, Victoria 3800, Australia,The Melbourne Centre for Nanofabrication 151 Wellington Road, Clayton, Victoria 3168, Australia;

    Department of Materials Engineering Monash University Wellington Road, Clayton, Victoria 3800, Australia;

    Department of Materials Engineering Monash University Wellington Road, Clayton, Victoria 3800, Australia;

    Department of Materials Engineering Monash University Wellington Road, Clayton, Victoria 3800, Australia;

    Department of Materials Engineering Monash University Wellington Road, Clayton, Victoria 3800, Australia,The Melbourne Centre for Nanofabrication 151 Wellington Road, Clayton, Victoria 3168, Australia,Commonwealth Scientific and Industrial Research Organization Materials Science and Engineering Clayton South, Victoria 3169, Australia;

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