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Molecular-level local characterization of nano-materials and development of a STM probe-enhanced Raman spectroscopy system

纳米材料的分子级局部表征及STM探针增强拉曼光谱系统的开发

基本信息

批准号：
16310065
负责人：
FUKUMURA Hiroshi
金额：
$ 6.98万
依托单位：
TOHOKU UNIVERSITY (2006)Ritsumeikan University (2004-2005)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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

In this study, in order to obtain vibrational spectra in nano-regions space selectively, we have developed a measurement system as well as molecular systems for the confirmation of the system performance. The measurement system was assembled by using a scanning probe microscope and a Raman spectroscope. The excitation source for Raman spectroscopy was a 488 nm semiconductor laser and the detector was a cooled charge coupled device. Scanning probes were fabricated by chemical metal plating of silver on mechanically polished Pt/Ir wires. Silver particles were found to be 100-300 nm at the probe points by the use of a scanning electron microscope. Standard samples for space selective detection were prepared with photo-polymerization of a thiophene derivative. Grating structures of polythiophene were fabricated on transparent electro-conductive surfaces with the irradiation of 355 nm interference patterns. Under an optimal condition, structures with 2 micron line width, 3 micron spacing, 200 nm height were produced. The patterned surfaces were measured with the developed measurement system. The average signal intensity of 1400-1550 cm-1 attributed to a stretching vibrational mode of thiophene was measured at 10 x 10 points and spatially mapped. We have confirmed clear grating structures formed on surfaces with this technique. Finally, we obtained some data suggesting that the system has a resolution of about 50 nm.

在这项研究中，为了在空间上选择性地获得纳米区域的振动光谱，我们开发了测量系统和分子系统来确认系统的性能。测量系统由扫描探针显微镜和拉曼光谱仪组成。喇曼光谱的激发源为488 nm半导体激光器，探测器为冷却电荷耦合器件。采用化学镀银的方法在机械抛光的Pt/Ir金属丝上制备扫描探针。利用扫描电子显微镜在探针点上发现银颗粒在100-300 nm之间。采用光聚合法制备了噻吩衍生物的空间选择性检测标准样品。在355nm干涉光的照射下，在透明导电表面制备了聚噻吩的光栅结构。在最佳条件下，可制得线宽2微米、间距3微米、高度200 nm的结构。利用开发的测量系统对图案表面进行了测量。在10 × 10点测量了噻吩的拉伸振动模式在1400 ~ 1550 cm-1范围内的平均信号强度，并绘制了空间图。我们已经证实用这种技术在表面上形成了清晰的光栅结构。最后，我们获得了一些数据，表明该系统的分辨率约为50 nm。