Water affinity and surface charging at the z-Cut and y-Cut LiNbO3 surfaces : an ambient pressure X-ray photoelectron spectroscopy study
Cordero Edwards, Rohini Kumara (Institut Català de Nanociència i Nanotecnologia)
Rodríguez Domínguez, Laura (Institut Català de Nanociència i Nanotecnologia)
Calò, Annalisa (Institut Català de Nanociència i Nanotecnologia)
Esplandiu Egido, Maria José (Institut Català de Nanociència i Nanotecnologia)
Pérez-Dieste, Virginia (ALBA Laboratori de Llum de Sincrotró)
Escudero, Carlos (ALBA Laboratori de Llum de Sincrotró)
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia)
Verdaguer Prats, Albert (Institut Català de Nanociència i Nanotecnologia)

Date:	2016
Abstract:	Polarization dependence of water adsorption and desorption on LiNbO₃ surfaces was demonstrated using X-ray photoelectron spectroscopy (XPS) carried out in situ under near-ambient conditions. Positive and negative (0001) faces (z-cut) of the same crystal were compared for the same temperature and pressure conditions. Our results indicate a preferential adsorption on the positive face of the crystal with increasing water pressure and also higher desorption temperature of the adsorbed molecular water at the positive face. Adsorption measurements on the (1100) face (y-cut) showed also strong affinity to water, as observed for the z-cut positive surface. We found a direct relation between the capacity of the surface to discharge and/or to screen surface charges and the affinity for water of each face. XPS spectra indicate the presence of OH groups at the surface for all the conditions and surfaces measured.
Grants:	European Commission 308023 Ministerio de Economía y Competitividad FIS2015-73932-JIN Ministerio de Economía y Competitividad FIS2013-48668-C2-1-P Ministerio de Economía y Competitividad MAT2012-38319-C02-01 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1216
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Adsorption measurement ; Ambient conditions ; Ambient-pressure x-ray photoelectron spectroscopies ; Desorption temperatures ; Polarization dependence ; Preferential adsorption ; Surface charging ; Temperature and pressures
Published in:	Journal of physical chemistry. C, Vol. 120, issue 42 (Oct. 2016) , p. 24048-24055, ISSN 1932-7455

DOI: 10.1021/acs.jpcc.6b05465

Postprint 9 p, 430.7 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > The ALBA Synchrotron
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