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A facile solid state synthesis route to tantalum oxynitride, β-TaON

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posted on 2024-01-22, 17:07 authored by Jessica C McGlynn, M Davide Cappelluti, James M Hanlon, Sina Saremi-YarahmadiSina Saremi-Yarahmadi, Nicolás Flores-González, Duncan H Gregory

Tantalum oxynitride is a prospective pigment and has attracted considerable recent attention as a photocatalyst for the overall splitting of water under visible light irradiation. Conventionally, TaON is synthesised by the thermal ammonolysis of Ta2O5, a process in which remains challenging to scale up. The use of ammonia/water or ammonia/oxygen within a narrow temperature window is required to produce high purity TaON material; otherwise Ta3N5 forms as the favoured ammonolysis product. It would be highly beneficial to develop a reliable, simpler and reproducible synthesis route to TaON without the use of gaseous ammonia under such complex conditions. This paper describes a facile synthesis route to monoclinic β-TaON (space group P21/c) using Ta3N5 itself as a solid state nitrogen source. After 6 h of reaction at 900 °C under vacuum followed by post-synthesis calcination at 580 °C for 30 min, the bright yellow oxynitride is produced as spherical particles ca. 80 nm in diameter with a direct band gap of 2.9 eV.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Solid State Sciences

Volume

148

Publisher

Elsevier Masson SAS

Version

  • VoR (Version of Record)

Rights holder

© Elsevier Masson SAS

Publisher statement

This is an Open Access Article. It is published by Elsevier Masson SAS under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2023-12-11

Publication date

2023-12-15

Copyright date

2023

ISSN

1293-2558

eISSN

1873-3085

Language

  • en

Depositor

Dr Sina Saremi Yarahmadi. Deposit date: 15 December 2023

Article number

107410

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