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Time-Resolved Tunneling Electron-Induced Anti-Stokes Raman Spectroscopy of Interface Aggregate

界面聚集体的时间分辨隧道电子诱导反斯托克斯拉曼光谱

基本信息

批准号：
16072203
负责人：
FUKUMURA Hiroshi
金额：
$ 60.67万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

This project has aimed to improve spatial resolution of Raman and luminescence spectroscopy. A variety of samples such as carbon nanotubes, gold-metal nano triangles, molecular aggregates were adsorbed at the surfaces of graphite or indium tin oxide plates. The instruments for these measurements were designed and built up in the laboratory. Tunneling probes were made with the electro-chemical etching of silver/copper metal alloy wires or chemical coating of silver metal on electro-chemically sharpened tungsten wires. We have found that the spatial resolution of Raman spectroscopy was improved to be in the range of several tens of nanometer when nanotubes were measured ; however, the topographical images did not always correspond with the spectral images. This deviation is considered to be due to differences in the spaces where the plasmonic enhancement takes place and the tunneling current flows. Photoluminescence of cadmium serenade quantum dots on indium tin oxide plates showed significant dependence on the distance between the quantum dots and tunneling probes with a nanometer precision. Gold nano triangles adsorbed on indium tin oxide surfaces were found to give good atomic-flat surfaces for scanning tunneling microscopy as well as to give semi-transparent substrates for inverse-type optical microscopy. Moreover, we found that some parts of gold nano triangles emitted luminescence only by approaching tunneling probes. These results are expected to contribute the development of high spatial resolution spectroscopy for the nano world.

本项目旨在提高拉曼和发光光谱的空间分辨率。将碳纳米管、金-金属纳米三角形、分子聚集体等样品吸附在石墨或氧化铟锡表面。这些测量的仪器是在实验室里设计和制造的。采用电化学腐蚀银/铜合金丝或在电化学磨尖钨丝上化学镀银金属的方法制备了钨探针。我们发现，当测量纳米管时，拉曼光谱的空间分辨率提高到几十纳米的范围内，然而，形貌图像并不总是与光谱图像相对应。这种偏差被认为是由于等离子体增强发生的空间和隧穿电流流动的差异。铟锡氧化物板上的镉小夜曲量子点的光致发光显示出量子点和隧道探针之间的距离的纳米精度显着依赖。金纳米三角形吸附在氧化铟锡表面上，被发现给扫描隧道显微镜良好的原子平坦的表面，以及给半透明衬底的反型光学显微镜。此外，我们还发现部分金纳米三角形只有在接近隧道探针时才能发光。这些结果有望有助于纳米世界的高空间分辨率光谱学的发展。