Print Email Facebook Twitter Comparison of nitric oxide binding to different pure and mixed protoporphyrin IX monolayers Title Comparison of nitric oxide binding to different pure and mixed protoporphyrin IX monolayers Author Knoben, W. Crego-Calama, M. Brongersma, S.H. Publication year 2012 Abstract The nitric oxide (NO) binding properties of monolayers of four different protoporphyrins IX adsorbed on aluminum oxide surfaces have been investigated. XPS and AFM results are consistent with the presence of a monolayer of porphyrins, bound to the surface by their carboxylic acid groups and with the porphine ring oriented more or less perpendicular to the surface. Kelvin probe measurements were done in which the samples were exposed to varying NO concentrations. NO binds strongly to all porphyrins, but protoporphyrin IX zinc(II) (Zn-PP) shows the most promising response. The response rate could be increased by adding spacer molecules to the porphyrin layer. Low ppb levels of NO were easily detected in ambient conditions. The NO binding properties of Zn-PP compare favorably to those of other porphyrins which were previously used for NO sensing. This makes Zn-PP a new and promising candidate for this application. © 2012 Elsevier B.V. All rights reserved. Subject Mechatronics, Mechanics & MaterialsHOL - HolstTS - Technical SciencesHigh Tech Systems & MaterialsIndustrial Innovation(proto)Porphyrins(self-assembled) monolayerAdsorptionAluminum oxideGas sensingKelvin probeNitric oxide (NO)Work functionAFMAluminum oxide surfacesAluminum oxidesAmbient conditionsBinding propertiesCarboxylic acid groupsGas sensingKelvin probeKelvin Probe measurementsNO bindingNO concentrationPorphinePpb levelsProtoporphyrin IXProtoporphyrin IX zincsProtoporphyrinsResponse rateSelf-assembledSpacer moleculesAdsorptionBinding energyCarboxylic acidsMonolayersNitric oxideWork functionZincZinc compoundsPorphyrins To reference this document use: http://resolver.tudelft.nl/uuid:d52cb1d9-4bca-4ec5-b8f7-39d133fb90cf DOI https://doi.org/10.1016/j.snb.2012.02.06 TNO identifier 461310 ISSN 0925-4005 Source Sensors and Actuators, B: Chemical, 166-167, 349-356 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.