検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年
検索結果: 3 件中 1件目~3件目を表示
  • 1

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

使用言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

選択した検索結果をダウンロード

論文

In situ transmission electron microscopy observation of melted germanium encapsulated in multilayer graphene

鈴木 誠也; 根本 善弘*; 椎木 菜摘*; 中山 佳子*; 竹口 雅樹*

Annalen der Physik, 535(9), p.2300122_1 - 2300122_12, 2023/09

 被引用回数:0 パーセンタイル:0(Physics, Multidisciplinary)

Germanene is a two-dimensional (2D) germanium (Ge) analogous of graphene, and its unique topological properties are expected to be a material for next-generation electronics. However, no germanene electronic devices have yet been reported. One of the reasons for this is that germanene is easily oxidized in air due to its lack of chemical stability. Therefore, growing germanene at solid interfaces where it is not oxidized is one of the key ideas for realizing electronic devices based on germanene. In this study, the behavior of Ge at the solid interface at high temperatures was observed by transmission electron microscopy (TEM). To achieve such in situ heating TEM observation, we fabricated a graphene/Ge/graphene encapsulated structure. In situ heating TEM experiments revealed that Ge like droplets moved and coalesced with other Ge droplets, indicating that Ge remained as a liquid phase between graphene layers at temperatures higher than the Ge melting point.

論文

Carbonated nanohydroxyapatite from bone waste and its potential as a super adsorbent for removal of toxic ions

関根 由莉奈; 南川 卓也; 山田 鉄兵*; 松村 大樹; 根本 善弘*; 竹口 雅樹*; 杉田 剛; 下山 巖; 香西 直文; 諸岡 聡

Journal of Environmental Chemical Engineering, 9(2), p.105114_1 - 105114_12, 2021/04

 被引用回数:7 パーセンタイル:50.7(Engineering, Environmental)

有害金属除去は安心安全社会構築のために必要な技術である。本研究では、骨の有するイオン交換能を最大限に活用して廃材を用いた有害金属除去材料の開発を行った。炭酸塩水溶液に骨を浸漬することで高炭酸含有ナノアパタイトが形成することを見出した。この材料は、通常の骨、また合成アパタイトに比べて約250、4500倍高いストロンチウム吸着性能を示した。本材料は廃材を利用していることから、低コストかつ高性能な吸着剤として活用が期待できる。

口頭

In situ transmission electron microscopy observation of melted germanium sandwiched by multilayer graphenes

鈴木 誠也; 根本 善弘*; 椎木 菜摘*; 中山 佳子*; 竹口 雅樹*

no journal, , 

Germanene is a two-dimensional (2D) germanium (Ge) analogous of graphene, and its unique topological properties are expected to be a material for next-generation electronics. Germanene has already been grown on various metal surfaces by molecular beam epitaxy and segregation methods, but transferring it onto insulator surface to fabricate electronic devices is difficult in contrast to graphene. One potential solution is to grow germanene directly on the interface of the insulator. Based on this concept, we have grown germanene at the hexagonal boron nitride (hBN)/Ag(111) interface and demonstrated that germane at the interface is stable. Since hBN is an insulator, direct growth of germanene between hBN provides a promising channel for germanene devices. In this work, we studied the crystallization of Ge between graphene layers at high temperatures using in situ transmission electron microscopy (TEM). Graphene was used as an alternative material for hBN. The Ge sandwiched by 4 layer graphenes was prepared onto an in situ TEM holder using chemical vapor deposited graphene, vacuum deposition of Ge, and wet transfer of graphene. The Raman spectrum of the sample indicated less defective graphene is present after the sample preparation. In situ TEM observation at 1025 degree Celsius revealed that round-shaped Ge moves, deforms, and coalesces at the temperature above the melting point of Ge. The observed motion of Ge indicates that the Ge was in liquid phase and its evaporation was suppressed by graphene layers. Although more novel ideas are needed to achieve 2D crystal growth of Ge at the interface, the present results may provide clues for the future direct growth of germane between hBN layers.

3 件中 1件目~3件目を表示
  • 1