ELECTROCHEMICAL MICROSENSOR FOR THE DETECTION OF NA+ IONS

Authors
GUESSOUS A SARRADIN J PAPET P PRADEL A RIBES M
Citation
A. Guessous et al., ELECTROCHEMICAL MICROSENSOR FOR THE DETECTION OF NA+ IONS, Sensors and actuators. B, Chemical, 27(1-3), 1995, pp. 360-363
Citations number
9
Categorie Soggetti
Engineering, Eletrical & Electronic","Instument & Instrumentation
Journal title
Sensors and actuators. B, Chemical → ACNP
ISSN journal
09254005
Volume
27
Issue
1-3
Year of publication
1995
Pages
360 - 363
Database
ISI
SICI code
0925-4005(1995)27:1-3<360:EMFTDO>2.0.ZU;2-K
Abstract
Thin vitreous films were elaborated by microelectronic techniques (vac uum evaporation, r.f. sputtering) and structural and electrical proper ties were characterized respectively by X-ray diffractometry and compl ex impedance spectroscopy measurements. Morphology and composition of thin films were examined by scanning electron microscopy with energy d ispersive spectroscopic microprobe. Based on these thin films, Na+-sel ective microsensors were built up with a sodium aluminosilicate glass as the sensitive membrane and thin film of borophosphate as the ionic bridge acting as an interfacial layer providing an ionic and electroni c exchange between the collector and the sensitive membrane. Electroch emical behaviour and sensitivity results regarding the microsensor wer e investigated. Microsensors exhibit near-Nernstian response in the Na +-concentration range of 10(-1)-10(-4) mol/l with a detection limit cl ose to 5X10(-4) M and good reproducibility.