Development of Highly Visible-light Sensitive Photocatalyst by Controlling Surface Nano-structure of TiO_2 with Cold Plasma Treatments

冷等离子体处理控制TiO_2表面纳米结构开发高可见光敏感光催化剂

• 批准号: 15360394
• 负责人: YAMADA Kenji
• 金额: $ 4.93万
• 依托单位: Kitakyushu National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360394/
• 关键词: Materials Processing and Treatment; Plasma Processing; Surface and Interface Properties; Structural and Function Materials; Nano-materials; Catalytic and Chemical Processes

A film composed of TiO_2 particles was treated with argon and nitrogen plasmas, in series, with magnetron-type cold plasma reactor. According to XRD analysis, half-value width of anatase (101) plane was increased with nitrogen-doping and it becomes apparent that crystal lattice of anatase was distorted with nitrogen-doping. Such lattice distortion will be originated with formations of Ti-N bonds and oxygen defects.The plasma-treated film revealed visible-light absorption, in addition to ultraviolet-light absorption. Visible-light activity appeared, corresponding to the visible-light absorption. The appearance of the visible-light activity will be originated by the formation of Ti-N bonds. According to theoretical analysis of band structure for the nitrogen-doped TiO_2, the formation of Ti-N bonds will be adequate for narrowing of the band gap in the visible-light active TiO_2. Optimum content of Ti-N bonds is necessary to obtain the highest visible-light activity. A large excess of Ti-N bonds will bring about an increase in oxygen defects which depress the visible-light activity of the particles.In this work, it becomes apparent that surface nano-structure of TiO_2 particles can be controlled by the cold plasma treatments. It is possible by the cold plasma treatments to accelerate the formation of Ti-N bonds and depress the formation of the oxygen defects in the particles, and highly sensitive photocatalyst can be developed by the appearance of the visible-light activity in the particles.

利用磁控管型冷等离子体反应器对TiO_2颗粒组成的薄膜进行串联氩气和氮气等离子体处理。根据XRD分析，锐钛矿(101)面的半值宽度随着氮掺杂而增加，并且明显看出锐钛矿的晶格因氮掺杂而扭曲。这种晶格畸变源于Ti-N键和氧缺陷的形成。等离子体处理的薄膜除了紫外光吸收之外还显示出可见光吸收。出现了可见光活性，对应于可见光吸收。可见光活性的出现将源于Ti-N键的形成。根据氮掺杂TiO_2能带结构的理论分析，Ti-N键的形成足以缩小可见光活性TiO_2的带隙。为了获得最高的可见光活性，Ti-N 键的最佳含量是必要的。大量过量的Ti-N键会导致氧缺陷的增加，从而抑制颗粒的可见光活性。在这项工作中，很明显，TiO_2颗粒的表面纳米结构可以通过冷等离子体处理来控制。通过冷等离子体处理可以加速Ti-N键的形成并抑制颗粒中氧缺陷的形成，并且通过颗粒中可见光活性的出现可以开发高灵敏度的光催化剂。

项目成果

Surface Modification of Titanium Dioxide Particles in RF Plasmas

射频等离子体中二氧化钛颗粒的表面改性

• 发表时间: 2003
• 期刊: Book of Abstracts of 21^<st> International Conference on Photochemistry
• 作者: K.Yamada;H.Nakamura;S.Matsushima;H.Yamane;T.Kajiyama
• 通讯作者: T.Kajiyama

S.Matsushima, K.Obata, H.Nakamura, M.Arai, K.Kobayashi: "First-principles Energy Band Calculation for Undoped and N-doped InTaO_4 with Layered Wolframite-type Structure"Journal of Physics and Chemistry of Solids. Vol.64. 2417-2421 (2003)

S.Matsushima，K.Obata，H.Nakamura，M.Arai，K.Kobayashi：“具有层状黑钨矿型结构的未掺杂和N掺杂InTaO_4的第一原理能带计算”固体物理与化学杂志。

M.Machida, K.Miyazaki, S.Matsushima, M.Arai: "Photocatalytic Property and Electronic Structure of Lanthanide Tantalates, MLnTa_2O_7 (M=Cs,Rb,Na, and H ; Ln=La,Pr,Nd, and Sm)"Journal of Materials Chemistry. Vol.13. 1433-1437 (2003)

M.Machida、K.Miyazaki、S.Matsushima、M.Arai：“镧系钽酸盐的光催化性能和电子结构，MLnTa_2O_7（M=Cs、Rb、Na 和 H；Ln=La、Pr、Nd 和 Sm）

Plasma-Graft Polymerization of a Monomer with Double Bonds onto the Surface of Carbon Fiber and Its Adhesion to a Vinyl Ester Resin

碳纤维表面双键单体的等离子体接枝聚合及其与乙烯基酯树脂的粘合

• 发表时间: 2003
• 期刊: Journal of Applied Polymer Science 90
• 作者: K.Yamada;H.Yamane;K.Kumada;S.Tanabe;T.Kajiyama
• 通讯作者: T.Kajiyama

Relationship between Surface Structure and Photocatalytic Property in Titanium Dioxide Particles Improved by Plasma Surface Modification

等离子体表面改性二氧化钛颗粒表面结构与光催化性能的关系

• 发表时间: 2005
• 期刊: Proceedings of The 8^<th> SPSJ International Polymer Conference
• 作者: K.Yamada;K.Ohira;N.Iwasawa;H.Yamane;S.Matsushima;H.Nakamura;K.Kumada;T.Kajiyama
• 通讯作者: T.Kajiyama