1,721,028 research outputs found
Methanol Vapours Recognised by SPR Technique of Self-assembled Dipyrromethane Thin Film Characterised by SERS
No full textSyn–anti conformation switching of a bis-porphyrin derivative at the air–water interface and in the solid state as an effective tool for chemical sensing
No full textA Langmuir film of bis(zinc octaethylporphyrin) (ZnPP) was characterised at the air–water interface and its
syn–anti conformation switching induced upon addition of aromatic amines was studied by infrared and
UV–vis reflection spectroscopic methods. The highly specific interaction of ZnPP with aromatic amines
was maintained even after the floating film was transferred onto solid supports by the Langmuir–
Schaefer (LS) technique, enabling us to selectively sense aromatic amines at concentrations as low as
20 ppb. Furthermore, LS ZnPP active layer selectivity was evaluated in the presence of aliphatic amines
Structural study of meso-octaethylcalix[4]pyrrole Langmuir-Blodgett films used as gas sensors
No full textMeso-Octaethyl-Porphyrinogen LB Films in Molecular Recognition of Alcohol Vapours by Surface Plasmon Resonance
No full textPorphyrinogen Pyrrole Macrocyclic Derivative Thin Layer for Optical Transduction Gas Sensors of Alcohol Vapours
No full textThin films of meso-octaethylporphyrinogen with different thickness were deposited on suitable substrates by Langmuir-Blodgett deposition technique in order to realize optical-sensitive active layers using Surface Plasmon Resonance (SPR) technique as transduction methodology. Analysis of the morphology of the sensing layers was performed by Atomic Force Microscopy. In particular, such coatings were tested for the detection of alcohol vapors such as ethanol, methanol and isopropanol. This
resulted in a reversible shift in the resonance depth and angular position of the SPR curves, depending on the interactions between the sensing layers and the alcohol vapor molecules. Different sensitivity and rate of response for different alcohol molecules were found and analyzed. Measurements of the sensing
response towards successive expositions of the sensing layers to methanol, ethanol and isopropanol vapors were performed in order to analyze the discrimination properties of the active layers towards the analytes
A SERS study of seld-assembled (4-methylthio)benzaldehyde thin films: a base monolayer for organic derivations on inorganic surfaces
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