近赤外領域でのフェムト秒時間分解分光測定を利用した光触媒微粒子計測法の開発

近红外区域飞秒时间分辨光谱光催化颗粒测量方法的开发

• 批准号: 14050031
• 负责人: 岩田 耕一
• 金额: $ 1.92万
• 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: 2002
• 资助国家: 日本
• 起止时间: 2002 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14050031/
• 关键词: フェムト秒; 時間分解; 近赤外; 分光計測法; 酸化チタン; 微粒子; キャリア生成機構

微粒子状の物質を試料とする時間分解分光測定では,従来,試料の光散乱が大きな妨害となっていた.このため時間分解測定の際に透過法ではなく拡散反射法を用いる例が圧倒的に多かった.しかし,拡散反射法では,試料の多重散乱によってポンプ光とプローブ光の光路差に分布が生ずるために測定の時間分解能が低下することが避けられない.これに対して,近赤外領域の分光法では,微粒子の試料に対しても時間分解能を損なうことなく透過法を用いることができる.本年度,岩田らは,自作のフェムト秒時間分解近赤外分光計を利用して,二酸化チタン微粒子を光照射したときに生じる物理・化学過程を時間分解近赤外分光法で追跡する課題に取り組んだ.白金を担持した二酸化チタン微粒子(粒径約20nm)を400nmの光で照射すると,波長0.8μmから1.4μmにわたる幅広い過渡吸収帯が観測された.この吸仮帯は,光照射によって生成した電子による吸収帯と考えられる.スペクトル形状に顕著な時間変化はなく,観測している状態の電子の生成は装置関数の範囲内(200フェムト秒程度)で即時的であった.電子の減衰曲線には,数百フェムト秒の速い成分と3ピコ秒程度では減衰しない長寿命の成分の2種類があった.ポンプ光強度を大きくして時刻0における電子の生成密度を大きくすることによって,速い減衰の成分の相対比が大きくなることが分かった.今回観測された電子は,光触媒反応において還元反応に利用されるものである.フェムト秒時間分解近赤外分光法を利用することによって,実際の化学反応に用いられる微粒子の試料における光触媒反応の初期過程を観測することができた.

Particulate matter material material time decomposition spectrophotometric determination method, since the material is scattered, it does not affect the quality of the material. The time decomposition method is used to determine the transmission method, and the diffuse reflection method is used to determine the number of samples that have been inverted. In this paper, we use the method of dispersion reflection method to analyze the distribution of optical path difference of optical fiber, the distribution of optical path difference, and the time decomposition of temperature measurement. In the near infrared field, the spectroscopic method is used in the field, and the time decomposition of the micro-particle material can be used in the transmission method. This year, Takashi Iwata, self-made near-infrared spectroscopic time decomposition near-infrared spectroscopic analysis, the use of dicarboxylic acid phosphor particles to illuminate the process of physics and chemistry, near-infrared spectrophotometry, time decomposition, near-infrared spectrophotometry, near-infrared spectrophotometry. Platinum is responsible for the photoluminescence of dicarboxylic acid-treated fine particles (about 20nm) 400nm phosphorescence with a wavelength of 0.8 μ m and 1.4 μ m across the absorption spectrum. It is necessary to inhale the electricity, and the light is irradiated to generate the electricity, the electricity, the absorption, the examination. The key shape changes the temperature in time, and the computer generates a real-time temperature in the range of the number of devices (200 seconds). The power supply decay curve is very high, with hundreds of thousands of seconds per second, the second second. When the intensity of light is very high, the density of the electron is very high, and the components of rapid decay are much higher than those of the other. This time, the photocatalyst is in the opposite direction, and the photocatalyst is in the opposite direction. The second-second time decomposition near-infrared spectrophotometry is used to analyze the chemical reaction of microparticles and photocatalyst in the early stage of the reaction.

项目成果

Hiro-o Hamaguchi, Koichi Iwata: "Physics and Chemistry of S_1 trans-Stilbene in Solution as Studied by Time-resolved Raman Spectroscopy"Bulletin of the Chemical Society of Japan. 75. 883-897 (2002)

Hiro-o Hamaguchi、Koichi Iwata：“通过时间分辨拉曼光谱研究溶液中 S_1 反式二苯乙烯的物理和化学”日本化学会会刊。

Koichi Iwata: "Effects of pump and probe light field on picosecond time-resolved resonsnace Raman spectra of S_1 trans-stilbene. Disagreement between Stokes-and anti-Stokes scattering frequencies"Bulletin of the Chemical Society of Japan. 75. 1075-1082 (2

Koichi Iwata：“泵浦和探测光场对 S_1 反式二苯乙烯的皮秒时间分辨共振拉曼光谱的影响。斯托克斯和反斯托克斯散射频率之间的分歧”日本化学会通报。