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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)5723-5730
Number of pages8
JournalCrystEngComm
Volume22
Issue number35
DOIs
Publication statusPublished - Sep 21 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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