Fabrication of Near-Field Plasmonic Tip by Photoreduction for Strong Enhancement in Tip-Enhanced Raman Spectroscopy
Fabrication of Near-Field Plasmonic Tip by Photoreduction for Strong Enhancement in Tip-Enhanced Raman Spectroscopy
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DOI：
10.1143/apex.5.052001
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发表时间：
2012-04
影响因子：
2.3
通讯作者：
T. Umakoshi;T. Yano;Y. Saito;P. Verma
中科院分区：
文献类型：
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作者：
T. Umakoshi;T. Yano;Y. Saito;P. Verma
针尖增强拉曼光谱（TERS）是纳米尺度样品光学分析和成像的最佳技术之一。TERS实验中最重要的一点是通过金属纳米尖端获得高信号增强。与完全金属化的尖端相比，在尖端处仅具有一个金属纳米颗粒的尖端显示出更好的增强。在这里，我们展示了一种新的和简单的方法来制造金属纳米粒子选择性地在尖端顶点通过光还原。通过控制纳米颗粒的尺寸，可以调谐尖端的等离子体共振。最后，我们证明，这样的提示，更好地增强TERS。
Tip-enhanced Raman spectroscopy (TERS) offers one of the best techniques for optical analysis and imaging of samples at nanoscale. The most important point in TERS experiments is to obtain a high signal enhancement through a metallic nanotip. Compared with fully metallized tips, the tips that have only one metallic nanoparticle at the apex show better enhancement. Here, we demonstrate a new and simple way to fabricate metallic nanoparticles selectively at the tip apex through photoreduction. By controlling the nanoparticle size, the plasmon resonance of the tip can be tuned. Finally, we demonstrate that such tips give better enhancement in TERS.