Mechanism study of metallic oxide nanorods fabricated by submerged photosynthesis of crystallites

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15122
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Hokkaido University
• Principal Investigator: JEEM MELBERT 北海道大学, 電子科学研究所, 助教 (00815805)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: ナノロッド / 電子顕微鏡 / 第一原理計算 / 光合成

Outline of Final Research Achievements

The research utilizes submerged photosysnthesis of crystallites (SPSC) method for metallic oxide nanostructures fabrication. Further, galvanic reaction was incorporated for facile ZnO/CuO hetero-nanorods synthesis. To elucidate the growth mechanism, STEM-VEELS, electron density of states (DOS) calculation based on crystal model, as well as optical reponse measurement were performed on the ZnO/CuO junction. On the basis of TEM observation, ZnO/CuO junction was established on {110} plane with <0.5% lattice mismatch. DOS calculation showed electrons transfer from CuO to ZnO, and interaction between interstitial Zn (IZn) and oxygen vacancy (Vo) is the reason for ZnO/CuO inheritance optical response.

Free Research Field

ナノ材料科学

Academic Significance and Societal Importance of the Research Achievements

SPSC法は、様々な金属基板に多種多様な金属酸化物のナノロッドを安価で簡便に大面積成長させることができることから産業応用上有利であり、さらに金属-金属酸化物ナノロッドの接合界面を舞台とした光エレクトロニクスや光エネルギー変換工学の学術領域の発展に貢献し、太陽電池、殺菌デバイス、ガスセンサー、光メッキ等、様々なデバイス開発にも利用できる。さらに、光と水を用いて水素と金属酸化物のみを生成する、グリーンテクノロジーであることも大きな強みである。