Preparation, Characterization and Application of Semiconductor Nanoparticulate Films

半导体纳米颗粒薄膜的制备、表征及应用

• 批准号: 07455340
• 负责人: YONEYAMA Hiroshi
• 金额: $ 4.29万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455340/
• 关键词: nanoparticle; nanoparticlulate film; photocatalytic reaction; titanium dioxide; cadmium sulfide; STM; 走査型トンネル顕微鏡; 自己組織化; 光触媒; 二酸化炭素; 電気泳動電着

Size-quantized semiconductor nanocrystals possess transient properties from bulk materials to molecules and have been very interesting research subjects. Many researches have been performed using suspended particles in solution. We have investigated preparation methods of nanoparticle films and properties of the prepared films. The following results were obtained in the present study.(1) Immobilization of size-quantized titanium dioxide particles in polyvinylpyrrolidinone (PVPD) gel films was accomplished using electrophoretic deposition of titanium dioxide nanoparticles stabilized by PVPD in 2-propanol. The obtained gel films had high photocatalytic activities for reduction of nitrate ion and carbon dioxide to give ammonia and methanol, respectively. If these films were irradiated in the presence of both nitrate ion and carbon dioxide, urea was photoformed. (2) The films of titanium dioxide nanoparticle immobilized in silica matrices were prepared using the sol-gel technique with hydrolysis of Ti (OEt) _4 and Si (OEt) _4. The photoreduction of carbon dioxide on the prepared films gave carbon monoxide and formate as the reduction products and the ratio of those two kinds of products were influenced by the dielectric constant of the solvents used ; the fraction of formate increased with increase of the dielectric constant of solvent used. (3) The monolayr film of cadmium sulfide nanoparticles was prepared by covalently immobilizing cadimium sulfide nanoparticle to Au (111) with use of chemistry of self-assembling. STM measurements revealed that the obtained monolayr film was composed of the nanoparticles of 2-3 nm diameter without aggregation. Tunneling spectroscopy of a single nanoparticle could be performed, and the energy structure of cadmium sulfide nanoparticle was successfully determined.

尺寸量子化的半导体纳米晶体具有从块体材料到分子的瞬态性质，一直是人们非常感兴趣的研究课题。许多研究已经使用溶液中的悬浮颗粒进行。我们研究了纳米颗粒薄膜的制备方法和所制备薄膜的性能。在本研究中获得了以下结果。(1)采用电泳沉积法将聚乙烯吡咯烷酮（PVPD）稳定的二氧化钛纳米粒子固定在2-丙醇中，制备了PVPD凝胶膜。所制备的凝胶膜对硝酸根离子和二氧化碳分别还原生成氨和甲醇具有较高的光催化活性。如果这些膜在硝酸根离子和二氧化碳的存在下被照射，则尿素被光形成。(2)以Ti（OEt）_4和Si（OEt）_4为原料，采用溶胶-凝胶法制备了二氧化钛纳米粒子固定在二氧化硅基体上的薄膜。CO2在薄膜上的光还原反应产生了一氧化碳和甲酸盐两种还原产物，其比例受溶剂介电常数的影响，甲酸盐的比例随溶剂介电常数的增大而增大。(3)利用自组装化学将硫化镉纳米粒子共价固定在Au（111）表面，制备了硫化镉纳米粒子单层膜。STM测试表明，所制备的单层膜由直径为2-3 nm的纳米粒子组成，无聚集现象。实现了对单个纳米粒子的隧道散射光谱测量，并成功地确定了硫化镉纳米粒子的能量结构。

项目成果

M.Nishizawa et.al.: "Photoimage Formation in a TiO_2 Particle-Incorporated Prussian Blue Film" Journal of Electrochemical Society. 143・11. (1996)

M.Nishizawa 等：“掺入 TiO_2 颗粒的普鲁士蓝薄膜中的光图像形成”，电化学学会杂志 143・11。

H.Matsumoto et.al.: "Preparation of Monodisperse CdS Nanocrystals by Size Selective Photocorrosion" J.Phys.Chem.100. 13781 (1996)

H.Matsumoto 等人：“通过尺寸选择性光腐蚀制备单分散 CdS 纳米晶体”J.Phys.Chem.100。

S. Kuwabata et al.: "Selective Photoreduction of Carbon Dioxide to Methanol on Titanium Dioxide Photocatalysts in Propylene Carbonate Solution" J. Chem. Soc., Chem. Commun.829-830 (1995)

S. Kuwabata 等人：“碳酸丙烯酯溶液中二氧化钛光催化剂上二氧化碳选择性光还原为甲醇”J. Chem。

H. Uchida et al.: "Preparation and Properties fo Size-Quantized TiO2 Particles immobilized in Polyvinylpyrrolidinone Gel Films" Langmuir. 11. 3725-3729 (1995)

H. Uchida 等人：“固定在聚乙烯吡咯烷酮凝胶薄膜中的尺寸量子化 TiO2 颗粒的制备和性能”Langmuir。

H.Uchida et.al.: "Preparation and Properties of Size-Quatized TiO_2 Particles Immobilized in Polyvinylpyrrolidinone Gel Films" Langmuir. 11. 3725 (1995)

H.Uchida 等人：“固定在聚乙烯吡咯烷酮凝胶膜中的尺寸季化 TiO_2 颗粒的制备和性能”Langmuir。