Time-resolved near-field spectroscopic study on photophysical processes at solid/liquid interface

固/液界面光物理过程的时间分辨近场光谱研究

• 批准号: 16072217
• 负责人: TAMAI Naoto
• 金额: $ 16.83万
• 依托单位: Kwansei Gakuin 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16072217/
• 关键词: Transient Absorption Microspectroscopy; Semiconductor Quantum Dot; Scanning Probe Microscopy; Silver Nanorod; Photoinc Crystal Fiber; Single Particle Spectroscopy; CdTe; フェムト秒; 量子ドット; 2光子励起; レーザー捕捉; 固液界面; フェムト秒顕微過渡吸収分光; ナノ微粒子; ホット電子

1) Spectroscopic Properties of Semiconductor Nanostructures by Scanning Probe Microspectroscopy Non-linear optical properties such as two-photon absorption cross section and nonlinear refractive index of CdTe QDs were found to strongly depend on a size of QDs. The figure of merit was also found to increase with decreasing the size. The size dependence of nonlinear optical properties was analyzed by the theory derived by Sheik Bahae. CdTe nanowires synthesized from QDs was analyzed by time-resolved SPM, suggesting the heterogeneity of nanowires. In addition, the exciton annihilation of nanowires increased as compared with QDs because of the energy diffusion in nanowires. In previous experiments, blinking behavior was observed for single QD embedded by PVA and trehalose. We have found that the silica coating of a single CdTe QD dramatically suppress the blinking, suggesting that the environmental condition plays an important role for luminescence properties of single QD. Furthermore, CdS … More e nanorods and QDs were synthesized at low temperature and their physicochemical properties have been examined by SPM.2) Synthesis and Characterization of Ag Nanorods Silver nanorods were prepared by a seed-mediated growth approach with chemical reduction of Ag^+ in a detergent aqueous solution. Longitudinal and transverse modes of plasmon absorption have been clearly observed in this synthetic approach. Transient absorption dynamics indicates that the coherent acoustic vibration with oscillation period of 20 to 40 ps was originated from the heat release of nanorods that induces a periodic shift of plasmon absorption bands. By the analysis of acoustic vibration, the size of synthetic nanorods and the aspect ratio have been estimated.3) Highly-sensitive, Broadband Transient Absorption Microspectroscopy Detection wavelength region was expanded up to 1.6 μm by using InGaAs photodiode as a detector, which enables us to examine the dynamics of exciton delocalization or weak intermolecular interaction dynamics in small domains at interface with high sensitivity of △OD = 10^<-7> 〜 10^<-8>..Global-pump and local-probe geometry was also successful for transient absorption SNOM experiments. Less

1)通过扫描探针显微光谱法观察半导体纳米结构的光谱特性发现CdTe QD的非线性光学特性例如双光子吸收截面和非线性折射率强烈依赖于QD的尺寸。还发现品质因数随着尺寸的减小而增加。通过 Sheik Bahae 导出的理论分析了非线性光学特性的尺寸依赖性。通过时间分辨 SPM 分析由 QD 合成的 CdTe 纳米线，表明纳米线的异质性。此外，由于纳米线中的能量扩散，与QD相比，纳米线的激子湮灭增加。在之前的实验中，观察到 PVA 和海藻糖嵌入的单个 QD 的眨眼行为。我们发现单个 CdTe QD 的二氧化硅涂层显着抑制了闪烁，这表明环境条件对单个 QD 的发光性能起着重要作用。此外，CdS ... More e 纳米棒和量子点在低温下合成，并通过 SPM 检查了它们的理化性质。2）银纳米棒的合成和表征通过种子介导的生长方法，在洗涤剂水溶液中化学还原 Ag^+ 来制备银纳米棒。在这种合成方法中可以清楚地观察到等离子体吸收的纵向和横向模式。瞬态吸收动力学表明，振荡周期为 20 至 40 ps 的相干声振动源自纳米棒的热量释放，引起等离子体吸收带的周期性移动。通过声振动分析，估计了合成纳米棒的尺寸和长宽比。3）高灵敏度、宽带瞬态吸收显微光谱法利用InGaAs光电二极管作为检测器，检测波长范围扩大到1.6μm，这使得我们能够检查激子离域动力学或界面小域中的弱分子间相互作用动力学。 高灵敏度△OD = 10^<-7> 〜 10^<-8>..全局泵浦和局部探针几何结构也成功用于瞬态吸收SNOM实验。较少的

项目成果

Transient Behavior of 2-(2',4'-dinitrobenzyl)pyridine Photochromism Studied by Ultrafast Laser Spectroscopy

超快激光光谱研究2-(2,4-二硝基苯甲基)吡啶光致变色的瞬态行为

• 发表时间: 2004
• 期刊: Chemical Physics 306
• 作者: S.Mitra;H.Ito;N.Tamai
• 通讯作者: N.Tamai

Detection of optical trapping of CdTe quantum dots by two-photon-induced luminescence

• DOI: 10.1103/physrevb.75.161305
• 发表时间: 2007-04-01
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Pan, Lingyun;Ishikawa, Atsushi;Tamai, Naoto
• 通讯作者: Tamai, Naoto

役に立つ化学シリーズ 2. 分子の物理化学

实用化学系列2.分子物理化学

• 发表时间: 2006
• 作者: 安保正一;川崎昌博編;玉井尚登(分担);川崎昌博 編
• 通讯作者: 川崎昌博 編

UV-Vis, NMR, and time-resolved spectroscopy analysis of photoisomerization behavior of three- and six-azobenzene-bound tris(bipyridine)cobalt complexes.

• DOI: 10.1021/ic0513538
• 发表时间: 2005-10
• 期刊: Inorganic chemistry
• 影响因子: 4.6
• 作者: Kyoko Yamaguchi;S. Kume;K. Namiki;Masaki Murata;N. Tamai;H. Nishihara

Molecular Translational Diffusion in Solution under Radiation Pressure of Near Infrared Laser Light

近红外激光辐射压力下溶液中的分子平移扩散

• 发表时间: 2006
• 期刊: Proceedings of SPIE 6326
• 作者: Syoji Ito;Takashi Sugiyama;Naoki Toitani;Genki Katayama;Lingyun Pan;Naoto Tamai;Hiroshi Miyasaka
• 通讯作者: Hiroshi Miyasaka