Fabrication of highly-oriented nanoporous oxides: fundamentals of self-organization of nanopores induced by strong anisotropic crystal structures

高取向纳米多孔氧化物的制备：强各向异性晶体结构诱导的纳米孔自组织的基础

• 批准号: 24760574
• 负责人: NAKAMURA Ryusuke
• 金额: $ 2.83万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24760574/
• 关键词: ナノポーラス; アモルファス構造; 酸化物; 構造解析; 拡散; ナノポーラス材料; アモルファス酸化物; 結晶化; 透過型電子顕微鏡; 拡散測定

The self-oriented formation of nanopores through the crystallization of amorphous Ta2O5 and Nb2O5 was found by the author. The phenomenon can be applicable to the preparation of new types of electronic devices and catalytic materials of transition-metal oxides. In the present project, the formation mechanisms of oriented nanopores were investigated mainly by transmission electron microscopy. Orthorhombic Ta2O5 and Nb2O5 have strong isotropic unit cells; the b axis is much longer than the a and b axes. It was found that the nanopores grow perpendicularly to the longitudinal b axis of both oxides. Furthermore, the elongation of nanopores was observed to be realized when the crystalline grains possess a variety of the periodicity in the b-axis direction. The author suggests the structural flexibility in the crystal growth of strong anisotropic structures plays an important role on the unidirectional growth of nanopores.

作者发现，通过非晶Ta_2O_5和Nb_2O_5的晶化，纳米孔的自取向形成。该现象可应用于新型电子器件和过渡金属氧化物催化材料的制备。在本项目中，主要通过透射电子显微镜研究了取向纳米孔的形成机制。正交晶系的Ta 2 O 5和Nb 2 O 5具有强的各向同性晶胞; B轴比a和B轴长得多。结果发现，纳米孔生长垂直于两种氧化物的纵向B轴。此外，当晶粒在b轴方向上具有各种周期性时，观察到纳米孔的伸长得以实现。作者认为，强各向异性结构晶体生长中的结构柔性对纳米孔的单向生长起着重要作用。

项目成果

アモルファス酸化物の潜在的欠陥構造に由来するナノポーラス構造の形成

由非晶氧化物的潜在缺陷结构衍生的纳米孔结构的形成

• 发表时间: 2013
• 作者: Kazuhiro Akutsu;Hiroki Iwase;Yuka Nakatani;Tomokazu Yoshimura;仲村龍介
• 通讯作者: 仲村龍介

Self-organization of nanoporous structures via annealing of amorphous oxides

通过非晶氧化物退火实现纳米多孔结构的自组织

• 发表时间: 2013
• 作者: R. Nakamura;M. Ishimaru;K. Sato;A. Hirata;M. Tane;H. Kimizuka;H. Nakajima
• 通讯作者: H. Nakajima

Atomic rearrangements in amorphous Al2O3 under electron-beam irradiation

• DOI: 10.1063/1.4790705
• 发表时间: 2013-02-14
• 期刊: JOURNAL OF APPLIED PHYSICS
• 影响因子: 3.2
• 作者: Nakamura, R.;Ishimaru, M.;Nakajima, H.
• 通讯作者: Nakajima, H.

電子照射によるアモルファスAl2O3の結晶化と構造変化の追跡

通过电子辐照跟踪非晶 Al2O3 的结晶和结构变化

• 发表时间: 2013
• 作者: S. Hasegawa;S. Takahashi;H. Iwase;S. Koizumi;M. Ohnuma;Y. Maekawa;仲村龍介,石丸学,保田英洋
• 通讯作者: 仲村龍介,石丸学,保田英洋

Formation of highly oriented nanopores via crystallization of amorphous Nb2O5 and Ta2O5

通过非晶态 Nb2O5 和 Ta2O5 结晶形成高度定向的纳米孔

• DOI: 10.1063/1.4822300
• 发表时间: 2013
• 期刊: JOURNAL OF APPLIED PHYSICS 114
• 作者: R. Nakamura;M. Ishimaru;K. Sato;K. Tanaka;H. Nakajima;T.J. Konno
• 通讯作者: T.J. Konno