Development of Analytical Method for Energy-resolved Distribution of Electron Traps for Identification and Detailed Analysis of Metal-oxide Powders

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H03923
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Hokkaido University
• Principal Investigator: Ohtani Bunsho 北海道大学, 触媒科学研究所, 教授 (80176924)
• Co-Investigator(Kenkyū-buntansha): 高島 舞 北海道大学, 触媒科学研究所, 助教 (10772345)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 電子トラップ / 光音響分光法 / エネルギー分布 / 同定 / 純度 / 粒子混合均一性

Outline of Final Research Achievements

The basic principle of reversed double-beam photoacoustic spectroscopy (RDB-PAS), enabling the measurement of energy-resolved distribution of vacant electronic states, electron traps, in the most of semiconducting metal oxides and carbon nitride, was clarified to extend the application of this method. Based on the measurement principle of RDB-PAS, the instrumental setup and measurement were improved and modified to obtain the results of conditions high-fidelity. The measurements were made on the wide range of samples to establish the quantitative measurements identicalness, similarity and differentness of sample pairs without using conventional analytical techniques and to characterize amorphous (non crystalline) and structures of solid samples, which have not been analyzed by the conventional techniques.

Free Research Field

無機材料化学

Academic Significance and Societal Importance of the Research Achievements

従来，分子状の有機化合物にのみ要求されてきた「同定」という概念が，逆二重励起光音響分光法による測定結果をつかって無機固体物質にも適用できることをしめした．これは，従来の分析手法では不可能な，アモルファス（非晶質）と表面構造を巨視的（マクロスコピック）かつ定量的に評価できたことにもとづく．本手法で「ほぼ同一」と判定された試料は，あらゆる物性，特性あるいは反応性がほぼおなじであることから，同定の妥当性がしめされた．また，無機固体物質にはなかった「純度」についても同様に定量できることをしめした．さらに，異種粒子間の相互作用が測定結果にあたえる影響を利用して，粒子の混合の均一性の評価も可能である．