Low temperature synthesis of(oxy) nitride

(氧)氮化物的低温合成

• 批准号: 22750191
• 负责人: WATANABE Tomoaki
• 金额: $ 2万
• 依托单位: Meiji University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22750191/
• 关键词: アンモノサーマル; 窒化物; 光触媒; 酸窒化物; 超臨界; 蛍光体; 安熱; アンモノサーマ

When considering nitrides as functional materials such as photocatalysts and phosphor, the effects of local structures such as surface morphology and defects in crystals are far more significant than those of the mean values of bulk properties. Therefore, when shifting the study of nitrides from the conventional to the new. such as from the study of nitrides as environmentally inert materials to nitrides as functional materials. it is necessary to re-evaluate, from the beginning, the methodology of nitride synthesis. Based on the above perspectives, we conduct our study with emphasis on the synthesis of functional nitride related materials, especially photocatalysts materials, using the ammonothermal method. In conclusion, we have succeeded to prepare LaTaON_2 perovskite with well crystallinity in supercritical ammonia with sodium amide at 600℃. And the photocatalytic properties of LaTaON_2 prepared by ammonothermal method have improved in comparison of LaTaON_2 by solid state reaction. Before and after reaction in supercritical ammonia with sodium amide as a mineralizer, the morphology and particle size was dramatically changed. So it may be considered this reaction proceed in NH_3-NaNH_2 solution as a solvent. This approach could be extended to synthesis of other oxynitrid groups.

当考虑氮化物作为功能材料，如光催化剂和荧光粉，局部结构的影响，如表面形貌和晶体中的缺陷是远远超过那些块体性能的平均值更显着。因此，当氮化物的研究从传统转向新的。例如从氮化物作为环境惰性材料的研究到氮化物作为功能材料的研究。有必要从一开始就重新评估氮化物合成的方法。基于上述观点，我们开展了氨法合成功能氮化物相关材料，特别是光催化材料的研究。综上所述，我们在600℃下，以氨为溶剂，在超临界氨介质中成功地制备了结晶性较好的钙钛矿型LaTaON_2。氨法制备的LaTaON_2的光催化性能比固相反应法制备的LaTaON_2有所提高。在超临界氨中以氨基钠为矿化剂反应前后，其形貌和粒径发生了显著变化。因此，可以认为该反应是在NH_3-NaNH_2溶液中进行的。这种方法可以推广到其他氧氮基团的合成。

项目成果

Crystallographic characterization of the crossed lamellar structure in the bivalve Meretrix lamarckii using electron beam techniques.

使用电子束技术对双壳文蛤交叉层状结构进行晶体学表征。

• 发表时间: 2011
• 期刊: Journal of Structural Biology
• 影响因子: 3
• 作者: A. Hayashi;N. Yokoo;Toshihiro Nakamura;Tomoaki Watanabe;H. Nagasawa;T. Kogure
• 通讯作者: T. Kogure

Defect controlled room temperature ferromagnetism in Co-doped barium titanate nanocrystals

• DOI: 10.1088/0957-4484/23/2/025702
• 发表时间: 2012-01
• 期刊: Nanotechnology
• 影响因子: 3.5
• 作者: S. Ray;Yury V. Kolen’ko;K. Kovnir;O. Lebedev;S. Turner;T. Chakraborty;R. Erni;Tomoaki Watanabe;G. Tendeloo;M. Yoshimura;M. Itoh

Fabrication of a Nacre-Like Aragonite/PAA Multilayer Film on a Nacre Substrate

• DOI: 10.1021/cg100709m
• 发表时间: 2010-11
• 期刊: Crystal Growth & Design
• 影响因子: 3.8
• 作者: A. Hayashi;Toshihiro Nakamura;Tomoaki Watanabe

Direct Fabrication of La2Ti2O7 Films on Titanium Metal Substrate by Hydrothermal Reaction

水热反应在钛金属基底上直接制备La2Ti2O7薄膜

• 发表时间: 2011
• 期刊: Trans. Mater. Res. Soc. Japan
• 作者: Akiko Hayashi;Naoki Yokoo;Toshihiro Nakamura;Tomoaki Watanabe;Hiromichi Nagasawa;Toshihiro Kogure;Chihiro Izawa and Tomoaki Watanabe
• 通讯作者: Chihiro Izawa and Tomoaki Watanabe

Fabrication of BaTiO3 Thin Films and Microdot Patterns by Halide‐Free Nonaqueous Solution Route

• DOI: 10.1111/j.1551-2916.2009.03383.x
• 发表时间: 2010-02
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: H. Wagata;T. Taniguchi;R. Gallage;A. Subramani;N. Sakamoto;Tomoaki Watanabe;M. Yoshimura;N. Matsushita