Development of growth theory of silver halides nanocrystals and nanocomposites with photocatalytic ability

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05275
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Kindai University
• Principal Investigator: Soejima Tetsuro 近畿大学, 理工学部, 准教授 (40512695)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 無機材料 / ナノ粒子 / 臭化銀 / 金 / 複合材料 / 光触媒

Outline of Final Research Achievements

In this study, we focused on silver halide, which has recently been attracting attention as one of the functional inorganic materials, and developed a new method for shape control of silver halide and its composite with gold nanocrystals. As a result, we found that the shape of silver halide nanocrystals can be controlled at room temperature in relation to the dissolution and re-precipitation in water, which is not considered to be soluble in water due to its low solubility. In addition, we found that the photoreduction of the gold complex triggers symmetry breaking, resulting in the growth of snowman-shaped gold-silver bromide nanoparticles. In addition, for further shape control and functionalization of inorganic crystals, we developed a novel synthetic method of inorganic nanomaterials such as gold and various functions such as photocatalysis.

Free Research Field

無機化学

Academic Significance and Societal Importance of the Research Achievements

本研究では，従来は無視されていたハロゲン化銀の溶解現象をその結晶成長に組み込み，ハロゲン化銀ナノ結晶の形状制御にとって重要な要素となり得ることを示した。これは，無機化合物におけるナノ結晶の形状制御にとって新たな指針を提供するものである。また，初めて金と臭化銀のナノ複合体の精密合成に成功するとともに，その界面に由来する増強電場を実験的に明らかにしたのは，本研究者が知る限り本報告のみである。また，本研究をとおして，本来は溶解度が小さく容易に析出すると思われていたハロゲン化銀材料について，共存する有機分子やイオンによってその析出が著しく抑制することがわかった。