Comparison of nitric oxide binding to different pure and mixed protoporphyrin IX monolayers

Autor: Wout Knoben, Sywert Brongersma, Mercedes Crego-Calama
Rok vydání: 2012
Předmět:
Response rate
NO binding
Protoporphyrins
HOL - Holst
High Tech Systems & Materials
(self-assembled) monolayer
chemistry.chemical_compound
polycyclic compounds
Materials Chemistry
Porphine
Instrumentation
Kelvin probe force microscope
TS - Technical Sciences
Industrial Innovation
Protoporphyrin IX
Nitric oxide binding
Metals and Alloys
NO concentration
Condensed Matter Physics
Surfaces
Coatings and Films
Electronic
Optical and Magnetic Materials
Zinc
AFM
Ppb levels
Nitric oxide (NO)
Porphyrins
Inorganic chemistry
chemistry.chemical_element
Aluminum oxide
Binding energy
(proto)Porphyrins
Work function
Binding properties
Self-assembled
Monolayer
Kelvin Probe measurements
Zinc compounds
Electrical and Electronic Engineering
Monolayers
Kelvin probe
Aluminum oxide surfaces
Carboxylic acids
Protoporphyrin IX zincs
Carboxylic acid groups
Nitric oxide
Self-assembled monolayer
Mechatronics
Mechanics & Materials
Porphyrin
chemistry
Aluminum oxides
Spacer molecules
Adsorption
Ambient conditions
Gas sensing
Zdroj: Sensors and Actuators, B: Chemical, 166-167, 349-356
ISSN: 0925-4005
DOI: 10.1016/j.snb.2012.02.068
Popis: 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.
Databáze: OpenAIRE
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