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.

该项目旨在改善拉曼和发光光谱的空间分辨率。各种样品，例如碳纳米管，金 - 金属纳米三角形，分子聚集体在石墨或二锡氧化物板的表面上吸附。这些测量的仪器是在实验室设计和建造的。用银/铜金属合金线的电化学蚀刻或银金属的化学涂层在电化化的钨电线上制成隧道探针。我们发现，当测量纳米管时，将拉曼光谱法的空间分辨率提高到几十纳米的范围。但是，地形图像并不总是与光谱图像相对应。这种偏差被认为是由于在发生等离子体增强和隧穿电流流动的空间中的差异所致。二氧化物氧化物板上的镉小夜曲量子点的光致发光表现出对具有纳米计精度的量子点和隧道探针之间的距离的显着依赖。发现在掺杂二锡氧化物表面上吸附的金纳米三角形可为扫描隧道显微镜提供良好的原子 - 平板表面，并为逆型光学显微镜提供半透明的底物。此外，我们发现仅通过接近隧道探针，金纳米三角形的某些部分才发出发光。预计这些结果将有助于纳米世界的高空间分辨率光谱的发展。