lab-on-a-chip sensors

To τεύχος του επιστημονικού περιοδικού αναλυτικής χημείας ΑNALYTICA CHIMICA ACTA για τον μήνα Ιανουάριο 2012, είναι αφιερωμένο στην εργασία με τίτλο "Microfabricated disposable lab-on-a-chip sensors with integrated bismuth microelectrode arrays for voltammetric determination of trace metals", συνεργασία του Εργαστήριου Αναλυτικής Χημείας του Πανεπιστημίου Αθηνών και του Ινστιτούτου Μικροηλεκτρονικής του ΕΚΕΦΕ Δημόκριτος. Χάρη στην πρωτοτυπία της εργασίας, το άρθρο χαρακτηρίστηκε από το περιοδικό ως "featured article" και φιλοξενείται και στο εξώφυλλο του περιοδικού.


This work reports the fabrication of disposable three-electrode cells with integrated metal-film electrodes. The devices were fabricated by a multi-step micro-fabrication approach combining sputtering for the deposition of metals and the dielectric material (SiO2) on the surface of a silicon wafer and photolithography for the definition of the geometry of the sensors. The working electrode was a microelectrode array consisting of bismuth microdisks while the reference and counter electrode strips were made of Ag and Pt, respectively. The utility of these devices was tested for the trace determination of Pb(II) and Cd(II) by anodic stripping voltammetry and Ni(II) by adsorptive stripping voltammetry. The detection of these trace metals was carried out in unstirred and undeoxygenated solutions exhibiting sub-μg/ L limits of detection and enhanced analytical characteristics compared to conventional bismuth-film electrodes.(...continue reading

Schematic diagram showing the fabrication of the sensor

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