A study on selective surface nitridation of TiO2 nanocrystals in the afterglows of N2 and N2-O2 microwave plasmas - Inria - Institut national de recherche en sciences et technologies du numérique Accéder directement au contenu
Article Dans Une Revue Applied Surface Science Année : 2018

A study on selective surface nitridation of TiO2 nanocrystals in the afterglows of N2 and N2-O2 microwave plasmas

Résumé

Surface-selective chemical modification of anatase TiO 2 nanocrystals is performed in the post-discharge region of N 2 microwave plasma and the chemical bonding states of surface nitrogen species are carefully evaluated using X-ray photoemission spectroscopy (XPS). It is found that the surface treatments in the afterglows induce the formation of stable nitrogen species at or near the surface of TiO 2 . Interestingly, the detailed bonding structure varies strongly depending on the afterglow condition. In pure N2 afterglows, various N species with a direct Ti N bond are formed on the surface, while the use of N 2 -O 2 mixtures induces the formation of additional oxidized species of NO 3 − on the surface. This is attributed to the high concentrations of O or NO in the afterglows of N 2 -O 2 plasmas. The incorporation of substitutional Nspecies in the subsurface is also achieved after a prolonged exposure in the early afterglow with a high density of N 2 + species. Our results show that the exposure condition can be controlled for a selective chemical modification of TiO 2 surface for the control of surface properties in various applications.

Domaines

Plasmas
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Dates et versions

hal-03828152 , version 1 (25-10-2022)

Identifiants

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Byungwook Jeon, Ansoon Kim, André Ricard, Jean-Philippe Sarrette, Xiaomei Yu, et al.. A study on selective surface nitridation of TiO2 nanocrystals in the afterglows of N2 and N2-O2 microwave plasmas. Applied Surface Science, 2018, 432, pp.163-169 ; Part B. ⟨10.1016/j.apsusc.2017.07.113⟩. ⟨hal-03828152⟩
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