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    Scanning Kelvin probe study of photolabile silane surface modification of indium tin oxide

    Year: 2013

    Journal: Surface and Interface analysis, Volume 45, Issue 9, pages 1347–1352, September 2013, 20131119

    Authors: Elaine Yee Ling Chak, Natalia Maria Pawlowsk, Christophe Blaszykowski, Michael Thompson

    Organizations: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada, M5S 3H6, Institute of Biomaterials & Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, Canada, M5S 3G9

    The scanning Kelvin nanoprobe (SKN) is an exquisitely sensitive device capable of detecting subtle changes in work functionassociated with alteration of surface chemistry and interfacial dipole. This instrument is highly versatile and has notably beenrecently used for (i) the investigation of biological interactions occurring at the interface of multiplexed microarrayedplatforms and (ii) the characterization of high work function materials for application in molecular optoelectronics. Herein,we further implement the SKN to characterize, along with angle-resolved X-ray photoelectron spectroscopy and contact anglegoniometry, the surface modification of indium tin oxide substrates with photopatternable silane adlayers. These molecularfilms are constructed in a straightforward and economical manner from alkyltrichlorosilane surface-modifying molecules thatpossess a distal, UV-photolabile o-nitrobenzyl moiety. Employing a photomask, we were able to selectively pattern regionsof the photoreactive silane adlayer and confirm the corresponding changes in surface potential through contact potentialdifference measurements.