Studies on Electrodes Modified by Noble Metal Nano-Particles Covered with Dye Aggregate

染料聚集体包覆贵金属纳米粒子修饰电极的研究

• 批准号: 16550117
• 负责人: SATO Tomoo
• 金额: $ 2.37万
• 依托单位: UNIVERSITY OF TSUKUBA
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16550117/
• 关键词: Surface Plasmon; Exciton; Noble Metal Nano-Particles; J-aggregate; Cyanine Dye; 真空蒸着法

The strength of absorption band of Frenkel exciton in J-aggregates of cyanine dyes on noble metal nano-particles (J-aggregate/noble metal nano-particles) is affected by the surface plasmon excited in the nano-particles. In this study, we tried to construct the J-aggregate/noble metal nano-particles on electrode, and we examined the possibility of the electrode for photo-electrochemical methods. Until this study, we have prepared the noble metal nano-particles on mica, which have the atomically flat surface. However, in the case of using other substrate whose surface would be rougher than mica, the best condition for making nano-particles was different. Therefore, we first searched for the best condition to make nano-particles by vacuum evaporation coating. As a result, although the size distribution of the particles was not so good, we could prepare the noble metal nano-particles, which have a desired plasmon band, on the substrate. We confirmed that J-aggregate of cyanine dye could adsorb on the noble metal nano-particles by using halogenations method or SAMs of aminothiol. However, the delamination of nano-particles from the substrate often occurred when the substrate with nano-particles was immersed in solutions. In case of using Ar ion sputter coating to prepare the noble metal nano-particles on the substrate, the nano-particles were less delaminated from the substrate during immersing process than the case of using vacuum evaporation coating. As a result, it became to possible to construct the J-aggregate/noble metal nano-particles on the electrode and to examine the photo-electrochemical properties. On the other hand, we measured the fluorescence decay curves and transient absorption spectra of the J-aggregate/noble metal nano-particles system, and obtained the new insight for the relaxation dynamics of the excited state of the system. Because photo-electrochemical process starts from the excited state of the system, it is important to know the dynamics.

在高贵金属纳米颗粒上（J-Aggregate/贵族金属纳米粒子）上氰氨酸染料J聚集物中Frenkel激子的吸收带的强度受到纳米粒子激发的表面等离子体的影响。在这项研究中，我们试图在电极上构建J型凝集物/贵金属纳米粒子，并检查了光电化学方法的电极的可能性。在这项研究之前，我们已经在具有原子表面的云母上准备了高贵的金属纳米颗粒。但是，如果使用其他底物的表面比云母更粗糙，那么制造纳米颗粒的最佳条件是不同的。因此，我们首先搜索了通过真空蒸发涂层制作纳米粒子的最佳条件。结果，尽管颗粒的尺寸分布不太好，但我们可以在底物上准备具有所需等离子体带的高贵金属纳米颗粒。我们证实，氰蛋白染料的J聚集物可以使用卤素法或氨基硫醇的Sams吸附在贵金属纳米粒子上。然而，当将纳米粒子的基板浸入溶液中时，纳米粒子从底物中的分层通常发生。如果使用Ar ion溅射涂层准备基板上的贵金属纳米颗粒，那么在浸入过程中，纳米颗粒与底物的分层较少，而不是使用真空蒸发涂层的情况。结果，有可能在电极上构造J凝集物/贵金属纳米粒子并检查光电化学性质。另一方面，我们测量了J凝集酸盐/贵族金属纳米粒子系统的荧光衰减曲线和瞬时吸收光谱，并获得了系统激发态弛豫动力学的新见解。因为光电化学过程从系统的激发状态开始，因此了解动力学很重要。