Quartz substrates were functionalized with a covalent 4-ClCH2C6H4SiCl3 monolayer. To this, N-(4-hydroxyphenethyl)-4,5-di[(2-picolyl)amino]-1,8-naphthalimide molecules were then covalently bonded, producing a new monolayer of these molecules on silica substrates. The surface chemical characterization of this hybrid material was carried out by X-ray photoelectron spectroscopy. The switching properties of this monolayer were studied at room temperature by UV-vis and XPS measurements. The system has reversible recognition properties for Cu2+ ions at sub-ppm levels and, therefore, can be reversibly switched using Cu ions as input and the absorbance intensity as output between two states represented by the free base and its copper complex. The adopted synthetic procedure has proven effective to transfer molecular properties to a solid state device.
Quartz substrates were functionalized with a covalent 4-ClCH(2)C(6)H(4)SiCl(3) monolayer. To this, N-(4-hydroxyphenethyl)-4,5-di[(2-picolyl)amino]-1,8-naphthalimide molecules were then covalently bonded, producing a new monolayer of these molecules on silica substrates. The surface chemical characterization of this hybrid material was carried out by X-ray photoelectron spectroscopy. The switching properties of this monolayer were studied at room temperature by UV-vis and XPS measurements. The system has reversible recognition properties for Cu(2+) ions at sub-ppm levels and, therefore, can be reversibly switched using Cu ions as input and the absorbance intensity as output between two states represented by the free base and its copper complex. The adopted synthetic procedure has proven effective to transfer molecular properties to a solid state device.
Viable route for switching of an engineered silica surface using Cu(2+) ions at sub-ppm levels
BALLISTRERI, Francesco Paolo;TOMASELLI, Gaetano;FRAGALA', Maria Elena;GULINO, Antonino
2010-01-01
Abstract
Quartz substrates were functionalized with a covalent 4-ClCH(2)C(6)H(4)SiCl(3) monolayer. To this, N-(4-hydroxyphenethyl)-4,5-di[(2-picolyl)amino]-1,8-naphthalimide molecules were then covalently bonded, producing a new monolayer of these molecules on silica substrates. The surface chemical characterization of this hybrid material was carried out by X-ray photoelectron spectroscopy. The switching properties of this monolayer were studied at room temperature by UV-vis and XPS measurements. The system has reversible recognition properties for Cu(2+) ions at sub-ppm levels and, therefore, can be reversibly switched using Cu ions as input and the absorbance intensity as output between two states represented by the free base and its copper complex. The adopted synthetic procedure has proven effective to transfer molecular properties to a solid state device.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
