On the relationship between the Raman scattering features and the Ti-related chemical states of TixOyNz films

Autor(es)

Zanatta, A. R. ^[1] ; Cemin, F. ^[2] ; Echeverrigaray, F. G. ^[2] ; Alvarez, F. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 14, p. 864-870, SEP-OCT 2021.
• Citações Web of Science: 0

Resumo

Owing to its singular and (to some extend) adaptable characteristics, titanium oxynitride (TixOyNz) represents an exceptional choice in the realm of new materials aiming at the development of practical devices. However, the effective use of TixOyNz in photovoltaic and (photo)catalysis applications, for example, relies on a refined production-properties balance. Accordingly, this paper reports on the physico-chemical properties of TixOyNz films as investigated by means of the Raman scattering and X-ray photoelectron spectroscopy (XPS) techniques - the former shedding light on the structural characteristics of the films, and the latter providing the state of oxidation of the film's constituents. The films were prepared by sputtering TiO2 and Ti targets in a plasma comprising different mixtures of Ar and N-2. Because of the deposition method and conditions, the films exhibit Raman spectra that are consistent with a combination of TiO2 and TiN or, more properly, TixOyNz under the amorphous and (nano/micro-)crystalline structures. In fact, the experimental data indicate the presence of four TiO2- and two TiN-related phonon modes, whose relative scattering features scale with the oxygen and nitrogen contents of the films. A similar concentration dependence was verified with the percentage of Ti4+, Ti3+, and Ti2+ chemical states of oxidation. This mutual concentration dependence was explored thoroughly and the results clearly indicate the suitability of the Raman data to estimate the typical atom composition and distribution of the Ti-related chemical states of TixOyNz. (C) 2021 The Author(s). Published by Elsevier B.V. (AU)

• Processo FAPESP: 19/18460-4 - Desenvolvimento e propriedades termomecânicas e tribológicas de materiais multicomponentes avançados de alta entropia
• Beneficiário: Fernando Alvarez
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/24461-0 - Estudo e desenvolvimento de filmes finos de ligas de alta entropia (LAE-F)
• Beneficiário: Felipe Cemin
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/00757-0 - Estudo e controle das orientações cristalinas em heterojunções MoS2/TiO2 e MoS2/TiO2:H e seus efeitos sobre suas propriedades físico-químicas
• Beneficiário: Fernando Graniero Echeverrigaray
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado