Fabrication of plate-like Ta3N5crystals through evaporation-deposition-re-evaporation of alkali halide fluxes onto tantalum substrates

Hajime Wagata; Minori Yanai; Daewook Kim; Sayaka Suzuki; Mirabbos Hojamberdiev; Kunio Yubuta; Chiaki Terashima; Katsuya Teshima

doi:10.1039/d0ce00806k

Fabrication of plate-like Ta₃N₅crystals through evaporation-deposition-re-evaporation of alkali halide fluxes onto tantalum substrates

Hajime Wagata, Minori Yanai, Daewook Kim, Sayaka Suzuki, Mirabbos Hojamberdiev, Kunio Yubuta, Chiaki Terashima, Katsuya Teshima

Materials Development Division

Research output: Contribution to journal › Article › peer-review

Abstract

Ta₃N₅nanostructured films have been explored as photoanodes for photoelectrochemical water splitting. Despite a number of efforts, it is still difficult to control the facet of single-crystalline Ta₃N₅, which directly affects the properties, due to its harsh growth conditions. In addition, the fabrication methods of Ta₃N₅films involve complex multi-step procedures and/or require complicated equipment. In this study, we report on facile fabrication of plate-like Ta₃N₅crystals with predominant {010} crystallographic planes covering the Ta substrate surface by flux growth under an ammonia gas flow. Among alkali halide fluxes (KF, KCl, and KI), KF emerged as an effective flux for the growth of Ta₃N₅crystals. Combining KF and KI promoted further crystal growth, producing larger Ta₃N₅crystals. The crystals were confirmed as single-crystalline by TEM. The crystal growth process and shape evolution in the flux were investigated and discussed.

Original language	English
Pages (from-to)	5723-5730
Number of pages	8
Journal	CrystEngComm
Volume	22
Issue number	35
DOIs	https://doi.org/10.1039/d0ce00806k
Publication status	Published - 2020 Sep 21

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1039/d0ce00806k

Cite this

Fabrication of plate-like Ta₃N₅crystals through evaporation-deposition-re-evaporation of alkali halide fluxes onto tantalum substrates. / Wagata, Hajime; Yanai, Minori; Kim, Daewook; Suzuki, Sayaka; Hojamberdiev, Mirabbos; Yubuta, Kunio; Terashima, Chiaki; Teshima, Katsuya.

In: CrystEngComm, Vol. 22, No. 35, 21.09.2020, p. 5723-5730.

Research output: Contribution to journal › Article › peer-review

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abstract = "Ta3N5nanostructured films have been explored as photoanodes for photoelectrochemical water splitting. Despite a number of efforts, it is still difficult to control the facet of single-crystalline Ta3N5, which directly affects the properties, due to its harsh growth conditions. In addition, the fabrication methods of Ta3N5films involve complex multi-step procedures and/or require complicated equipment. In this study, we report on facile fabrication of plate-like Ta3N5crystals with predominant {010} crystallographic planes covering the Ta substrate surface by flux growth under an ammonia gas flow. Among alkali halide fluxes (KF, KCl, and KI), KF emerged as an effective flux for the growth of Ta3N5crystals. Combining KF and KI promoted further crystal growth, producing larger Ta3N5crystals. The crystals were confirmed as single-crystalline by TEM. The crystal growth process and shape evolution in the flux were investigated and discussed.",

author = "Hajime Wagata and Minori Yanai and Daewook Kim and Sayaka Suzuki and Mirabbos Hojamberdiev and Kunio Yubuta and Chiaki Terashima and Katsuya Teshima",

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AU - Terashima, Chiaki

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N2 - Ta3N5nanostructured films have been explored as photoanodes for photoelectrochemical water splitting. Despite a number of efforts, it is still difficult to control the facet of single-crystalline Ta3N5, which directly affects the properties, due to its harsh growth conditions. In addition, the fabrication methods of Ta3N5films involve complex multi-step procedures and/or require complicated equipment. In this study, we report on facile fabrication of plate-like Ta3N5crystals with predominant {010} crystallographic planes covering the Ta substrate surface by flux growth under an ammonia gas flow. Among alkali halide fluxes (KF, KCl, and KI), KF emerged as an effective flux for the growth of Ta3N5crystals. Combining KF and KI promoted further crystal growth, producing larger Ta3N5crystals. The crystals were confirmed as single-crystalline by TEM. The crystal growth process and shape evolution in the flux were investigated and discussed.

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