269桑折 道済Michinari KOHRI梅山 有和10Tomokazu UMEYAMA液晶場を利用するホルミウムの配列と強磁性の発現（2019採択）Development of ferromagnetic material by assembly of holmium using liquid crystal(Project 2019)光機能化遷移金属ジカルコゲニドの開発と光エネルギー変換系への応用（2019採択）Development of Photofunctionalized Transition Metal Dichalcogenides and Their Application to Light Energy Conversion Systems(Project 2019)我々は，新たなソフト磁性体の開発に向け，ランタノイド元素の中で最も高い磁性を示すホルミウムに着目した研究を行なっている．本研究では，自己組織化的に組み上がる液晶の秩序性を利用し，ホルミウムに高い配向秩序性を付与した常温磁性体の作製を目指して研究を行った．ホルミウムとβ-ジケトン型配位子を用いて作成した錯体は自発的にカラム状液晶を形成し，室温でネオジウム磁石に瞬時に応答する優れた磁気特性を示した．分子設計により，低エネルギープロセスで元素を高秩序に配向したカラム状集合体の発現指針を見出すことに成功した．今後これらの材料の詳細な設計で，より磁気特性に優れた材料の作成が期待される．We are conducting research focusing on holmium, which has the highest magnetism among lanthanide ele-ments, for the development of new soft magnetic materials. In this research, we aimed to use liquid crystal to create a material in which holmium is ordered and exhibits magnetism at room temperature. The complex prepared using holmium and b-diketone ligand spontaneously formed a columnar liquid crystal and showed excellent magnetic properties that instantly react with neodymium magnets at room temperature. We have succeeded in finding a guideline for the preparation of columnar assembled structures in which holmium is highly ordered in a low-energy process. These findings will be expected to lead to the preparation of materi-als with better magnetic properties in the future.近年，遷移金属ジカルコゲニド（transition metal dichalcogenide, TMD）や15族元素などの二次元層状材料に大きな注目が集まっている．光エネルギー変換系などへの様々な応用を志向した二次元層状材料の更なる高機能化には，自在な設計が可能である有機分子との複合化が鍵となる．本研究では，ボールミル法を用いた固相反応により，代表的なTMDであるMoS2ナノシートの効率的な共有結合表面修飾を行い，光機能化することに成功した．さらに，アンチモネンやビスムテンなどの15族元素二次元層状材料と，電子受容性有機半導体であるフラーレンC60との複合化に成功し，光電流発生効率の増強などを実現した．Recently, two-dimensional layered materials, such as transition metal dichalcogenides (TMDs) and Group 15 elements, have attracted much attentions. Hybridization with organic molecules that have versatile design possibility can be the key to the functionalization of the two-dimensional layered materials for the wide appli-cations including light energy conversion systems. In this study, covalent surface modification and photo-functionalization of a representative TMD, MoS2 nanosheet, were conducted by a solid-state reaction using ball mill method. In addition, nanosheets of Group 15 elements, antimonene and bismuthene, were hybridized with an electron-accepting organic semiconductor, fullerene C60. The hybrid materials showed enhanced pho-tocurrent generation efficiencies.
元のページ ../index.html#30