Effects of UV laser radiation on the surface defects of NiO catalysts

Eugenia Ivana; Veronica Lacatusu; Mariana Chelu; Mariana Craiu; Constantin G. Fenic; Aurel Stratan; Leona C. Nistor; Cornel Ghica; P. Marginean

doi:10.1117/12.312760

2 July 1998 Effects of UV laser radiation on the surface defects of NiO catalysts

Eugenia Ivana, Veronica Lacatusu, Mariana Chelu, Mariana Craiu, Constantin G. Fenic, Aurel Stratan, Leona C. Nistor, Cornel Ghica, P. Marginean

Author Affiliations +

Proceedings Volume 3405, ROMOPTO '97: Fifth Conference on Optics; (1998) https://doi.org/10.1117/12.312760
Event: ROMOPTO '97: Fifth Conference on Optics, 1997, Bucharest, Romania

Abstract

NiO is a metal-deficient p-type semiconductor with surface defects which are correlated with the non-stoichiometry. The dissociative H₂ adsorption on the NiO surface takes place on oxygen-excess sites (over equilibrium). The H₂ TPD spectra vary significantly with calcination temperature (stoichiometry) and chemical treatment UV laser radiation enhances H₂ adsorption on the defective surfaces (non-stoichiometric) as compared with the stoichiometric ones, even chemically treated. The fourth harmonic of a Q-switched Nd:YAG laser is used for the NiO samples irradiation. The wavelength of the UV laser radiation is 266 nm, under the band-gap of the semiconductor.

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Eugenia Ivana, Veronica Lacatusu, Mariana Chelu, Mariana Craiu, Constantin G. Fenic, Aurel Stratan, Leona C. Nistor, Cornel Ghica, and P. Marginean "Effects of UV laser radiation on the surface defects of NiO catalysts", Proc. SPIE 3405, ROMOPTO '97: Fifth Conference on Optics, (2 July 1998); https://doi.org/10.1117/12.312760

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