Preparation of Quantum Dot Hybrid Arrays for the Application to Light Conversion Systems

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K19083
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Nagoya University
• Principal Investigator: Torimoto Tsukasa 名古屋大学, 工学研究科, 教授 (60271029)
• Project Period (FY): 2022-06-30 – 2024-03-31
• Keywords: イオン液体 / 金属スパッタリング / 単粒子層 / 複合ナノ粒子 / 金属ー半導体複合体

Outline of Final Research Achievements

A monolayer film composed of metal-semiconductor composite nanoparticles was fabricated by sequentially sputter-depositing metals onto an ionic liquid surface. At first, Au was sputter-deposited onto the ionic liquid, forming a monolayer film of Au nanoparticles on the liquid surface. Subsequently, Ni was sputter-deposited onto this film and then air-oxidized to produce a monolayer film of Au-NiOx composite nanoparticles. This film was transferred onto a glassy carbon electrode substrate using a horizontal deposition method. The cyclic voltammogram of the Au-NiOx composite revealed an oxidation peak corresponding to the oxidation of Ni(II) to Ni(III), in addition to the reduction peak of the AuOx monolayer on the Au surface. This confirms the formation of a monolayer film composed of Au-NiOx metal-semiconductor composite nanoparticles using a method involving sequential metal sputtering onto an ionic liquid.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

金属・半導体からなるナノ粒子は、サイズや形状に依存して物理化学特性が大きく異なる。さらにナノ粒子を異なる材料と複合化させると、ナノ粒子の形状を維持したまま特性を変調でき、触媒活性・光特性の向上を目指して活発に研究されている。本研究では、従来の液相化学合成法とは異なるイオン液体／金属スパッタ蒸着法を用い、新らたな複合ナノ粒子の合成法を確立した。さらに得られた複合ナノ粒子の自己組織化による単粒子層形成を確認できた。この方法をさらに発展させることで、従来法では作製困難な複合ナノ粒子集積体が作製できるようになり、新たな機能材料開発の手法になると期待される。