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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available