Fundamental Science and Technology of Photofunctional Interfaces

光功能界面基础科学与技术

• 批准号: 14050055
• 负责人: MAJIMA Tetsuro
• 金额: $ 53.63万
• 依托单位: Osaka 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: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14050055/
• 关键词: TiO_2 Photocatalyst; One-electron oxidation; Radicalion; Transient absorption measurement; Signle molecule spectroscopy; Singlet oxygen; Hydroxyl radical; TiO_2 Photocatalytic reaction mechanism; TiO_2光触媒反応; 光機能界面; ラジカルカチオン; -電子酸化; -電子還元; 過渡吸

The dynamic behaviors of radicals and radical ions generated on the surface of TiO_2 photocatalyst and the reactive intermediates from the reactions of the radicals and radical ions has been studied to elucidate 1) the reactive oxygen species and organic reactive intermediates generated during the TiO_2 photocatalytic reactions and 2) reactivities of organic radical ions generated during TiO_2 photocatalytic reactions, and to develop the method for the measurement of charge separation on the surface of the TiO_2 photocatalyst. There is an application to the environmental cleanup (contaminant processing) and medical technology as application of the TiO_2 photocatalyst reaction. An important finding was especially obtained in relation to it for the decomposition mechansm of the organic compounds in the TiO_2 photocatalyst reaction. In 2001-2005 fiscal years, we studied that adsorption and one-electron oxidation reaction process of the substrate adsorbed on the TiO_2 surface based on the … More time-resolved transient reflection measurement, and found that one-election oxidation efficiency depends on not only the oxidation potential of the substrate but also the electronic interaction between the substrate and surface of TiO_2 remarkably. In 2005-2007 fiscal years, we studied visible-light responsible TiO_2 photocatalyst, TiO_2 photocatalytic reaction in gas phase, one-electron redox processes during the polyoxometalate-mediated TiO_2 photocatalytic reactions, one-electron oxidation of organic molecule included in the cavity of β-cyclodextrin modified TiO_2 photocatalyst, and non-contact TiO_2 photocatalytic reaction based on the transient absorption measurement and single molecule fluorescence imaging technique. We found that the hydroxy radical and the singlet oxygen were generated from the surface of TiO_2 by the light irradiation of the TiO_2 photocatalyst and diffuse in 120 micrometer and 2 millimeter, respectively, in the atmosphere. We also studied nanoscopic heterogeneities in ddsorption and electron transfer processes of perylene diimide dye on TiO_2 nanoparticles, real-time single-molecule imaging of the spatial and temporal distribution of reactive oxygen species, and photocatalytic cleavage of single TiO_2/DNA nanoconjugates, as relation to solar cell, TiO_2 photocatalytic reaction mechanism at single molecule level, and DNA conjugate of TiO_2 photocatalyst.. In conclusion, our results can initiate to develop new TiO_2 photocatalyst and and the TiO_2 photocatalyst reaction system with a greatly highly efficiency and high selectivities. Less

研究了TiO_2光催化剂表面产生的自由基和自由基离子以及自由基和自由基离子反应产生的反应中间体的动态行为，以阐明1）TiO_2光催化反应过程中产生的活性氧和有机反应中间体以及2) TiO_2光催化反应中产生的有机自由基离子的反应活性，并建立了TiO_2表面电荷分离的测量方法TiO_2光催化剂反应在环境净化（污染物处理）和医疗技术方面的应用特别是在TiO_2光催化剂反应中的有机化合物的分解机理方面得到了重要的发现。 2001-2005财年，我们研究了基于TiO_2表面吸附的基质的吸附和单电子氧化反应过程通过时间分辨瞬态反射测量，我们发现单选氧化效率不仅取决于基材的氧化电位，而且还显着取决于基材与TiO_2表面之间的电子相互作用。研究了可见光响应的TiO_2光催化剂、气相TiO_2光催化反应、多金属氧酸盐介导的TiO_2过程中的单电子氧化还原过程基于瞬态吸收测量和单分子荧光成像技术，我们研究了光催化反应、β-环糊精修饰TiO_2光催化剂空腔内有机分子的单电子氧化以及非接触TiO_2光催化反应。 TiO_2光催化剂在光照射下，在TiO_2表面产生单线态氧，并在120微米内扩散，我们还研究了苝二酰亚胺染料在TiO_2纳米颗粒上的吸附和电子转移过程的纳米级不均匀性、活性氧时空分布的实时单分子成像以及光催化裂解。单一TiO_2/DNA纳米缀合物与太阳能电池的关系、单分子水平TiO_2光催化反应机理以及TiO_2的DNA缀合物总而言之，我们的研究结果可以开创开发新型TiO_2光催化剂和具有极高效率和高选择性的TiO_2光催化剂反应体系。

项目成果

Transannular distance dependence of stabilization energy of the intramolecular dimer radical cation of cyclophanes

• DOI: 10.1021/jp060709d
• 发表时间: 2006-05-04
• 期刊: JOURNAL OF PHYSICAL CHEMISTRY A
• 影响因子: 2.9
• 作者: Fujitsuka, Mamoru;Cho, Dae Won;Majima, Tetsuro
• 通讯作者: Majima, Tetsuro

電子線エネルギーの吸収と高励起状態、光応用技術・材料事典

电子束能量和高激发态的吸收，光学应用技术与材料百科全书

• 发表时间: 2006
• 作者: M.Endo;T.Majima;真嶋哲朗
• 通讯作者: 真嶋哲朗

Reaction of Triarylphosphine Radical Cations Generated from Photo-Induced Electron Transfer in the Presence of Oxygen

氧气存在下光诱导电子转移产生三芳基膦自由基阳离子的反应

• 发表时间: 2005
• 期刊: J.Org.Chem. 70・4
• 作者: K. Kawai;T. Majima;Masanori Sakamoto;Kiyohiko Kawai;Mamoru Fujitsuka;Michihiro Hara;Takashi Tachikawa;Yosuke Oseki;Shingo Samori;Takashi Tachikawa;Yosuke Oseki;Kazuya Naito;Masanori Sakamoto;Mamoru Fujitsuka;Xichen Cai;Masanori Sakamoto;Xichen Cai;Masanori Sakamoto;Michihiro Hara;Takumi Kimura;Shinro Yasui
• 通讯作者: Shinro Yasui

媒体中に金属ナノ粒子を形成する方法

在介质中形成金属纳米粒子的方法

• 发表时间: 2006

Significant Effects of Substituents on Substituted Naphthalenes in the Higher Triplet Excited States

取代基对高三重激发态取代萘的显着影响

• 发表时间: 2005
• 期刊: J.Phys.Chem.A 109・21
• 作者: K. Kawai;T. Majima;Masanori Sakamoto;Kiyohiko Kawai;Mamoru Fujitsuka;Michihiro Hara;Takashi Tachikawa;Yosuke Oseki;Shingo Samori;Takashi Tachikawa;Yosuke Oseki;Kazuya Naito;Masanori Sakamoto;Mamoru Fujitsuka;Xichen Cai;Masanori Sakamoto
• 通讯作者: Masanori Sakamoto