INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Electrical properties of AgGeSe films used in ion selective electrodes
Autor/es:
J. M. CONDE GARRIDO; M. A. UREÑA; B. ARCONDO
Lugar:
Buenos Aires, Argentina
Reunión:
Congreso; At the Frontiers of Condensed Matter V 2010; 2010
Resumen:
Chalcogenide glasses have been used as sensitive membranes in ion selective electrodes (ISEs) for more than three decades. Their chemical stability ensures high endurance even in aggressive acidic media and their remarkable glass forming ability enables the use of these materials, either as bulk or as thin films, in the development of sensitive membranes for micro-sensors or multi-sensor arrays. In order to understand the sensing properties of these materials it is necessary to know first its electrical properties. The bulk chalcogenide glasses Agx(Ge0.25Se0.75)100-x (0 at.% ≤ x ≤ 25 at.%) have been studied as sensitive materials for ISEs. For x ≥ 8 at.% the glasses exhibit sensibility to Ag+ and Cu2+ ions in aqueous solutions. For x < 8 at.% the electrode’s response was poor with almost no sensibility. On the other hand, this system behaves as ionic conductor (10-5 S/cm) for x ≥ 8 at.% and as insulator (