Mechanisms and Applications of Photocatalytic Reactions in the Gas Phase

气相光催化反应机理及应用

基本信息

批准号：
14050028
负责人：
TATSUMA Tetsu
金额：
$ 34.75万
依托单位：
The University of Tokyo
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

项目摘要

Major mechanisms of photocatalytic remote oxidation and photocatalytic lithography were revealed to be as follows: hydrogen peroxide generated on a photocatalyst diffuses in the gas phase, followed by photolysis to hydroxyl radicals, which are the active species. Photocatalytic lithography was applied to development of multichannel biosensor arrays.Regarding electron exchange between a photocatalyst with redox-active solids and the application to energy storage photocatalysts, photo-induced electron transfer and proton transport from TiO_2 to WO_3 and MoO_3 were studied. Quantum efficiencies and capacities of the reductive energy storage and effects of adsorbed water on the energy storage were studied. It was found that electron transfer is possible from Ni(OH)_2 to holes in photo-excited TiO_2. A TiO_2-Ni(OH)_2 composite film works as an oxidative energy storage photocatalyst. It should be able to remove some harmful compounds such as formaldehyde even after dark. An Ir oxide and a Ru oxide exhibit higher oxidation abilities as oxidative energy storage materials.Regarding plasmon photoelectrochemistry of metal nanoparticles-semiconductor systems, multicolor photochromism of Ag nanoparticles-TiO_2 systems was found. In the mechanistic study of the photochromism, it was found that photo-induced charge separation at the metal nanoparticle-semiconductor interface plays an essential role. The charge separation process can be applied to solar cells and photocatalysis. I was evidenced that photoelectrochemical dissolution of Ag nanoparticles resonant with an incident light and deposition and growth of non-resonant Ag nanoparticles are responsible for the spectral changes.Au nanostructures were developed and nanopyramids were found to exhibit a broad plasmon resonance band. Photoelectrochemical actuators, which swell and shrink in response to light were developed. Biosensors based on algal phototaxis were also developed.

光催化遥控氧化和光催化光刻的主要机制如下：在气相中的光催化剂扩散上产生的过氧化氢，然后将光解至羟基自由基，即活性物质。光催化光刻应用于多通道生物传感器阵列的开发。用氧化还原活性固体的光催化剂之间的电子交换，并应用于储能光催化剂，光诱导的电子传输以及从TiO_2到WO_3和MOO_3的质子传输。研究了量子效率和还原能量存储的能力以及吸附水对能量存储的影响。发现电子转移可以从Ni（OH）_2到光兴奋的TiO_2中的孔。 Tio_2-Ni（OH）_2复合膜充当氧化储能光催化剂。即使在天黑后，它也应该能够去除一些有害化合物，例如甲醛。 IR氧化物和RU氧化物作为氧化能量储存材料表现出较高的氧化能力。在金属纳米颗粒 - 轴导剂系统中，发现了等离子体的光电化学，AG纳米颗粒的多色光色素tio_2 Systems。在光色素的机械研究中，发现金属纳米粒子 - 触发器界面上光诱导的电荷分离起着至关重要的作用。电荷分离过程可以应用于太阳能电池和光催化。我被证明是，Ag纳米颗粒的光电化学溶解与非共振Ag纳米颗粒的入射光和沉积以及生长有关光谱变化的原因。开发了AU纳米结构。开发了纳米型纳米型纳米酰胺剂，表现出广泛的Plasmon共振带。开发了光电化学致动器，响应光而膨胀和收缩。还开发了基于藻类光的生物传感器。