Novel Organic Membrane-based Thin-film Microsensors for the Determination of Heavy Metal Cations

A first step towards the fabrication and electrochemical evaluation of thin-filmmicrosensors based on organic PVC membranes for the determination of Hg(II), Cd(II),Pb(II) and Cu(II) ions in solutions has been realised. The membrane-coating mixture used inthe preparation of this new type of microsens...

Full description

Saved in:
Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2006-04, Vol.6 (4), p.435-444
Main Authors: Arida, Hassan A., Kloock, Joachim P., Schöning, Michael J.
Format: Article
Language:English
Subjects:
Electrodes
Full Research Paper
Gadolinium oxide
Heavy metal detection
Membranes
organic PVC membranes
potentiometry
Sensors
Silicon nitride
Silicon wafers
Thin films
thin-film microsensors
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A first step towards the fabrication and electrochemical evaluation of thin-filmmicrosensors based on organic PVC membranes for the determination of Hg(II), Cd(II),Pb(II) and Cu(II) ions in solutions has been realised. The membrane-coating mixture used inthe preparation of this new type of microsensors is incorporating PVC as supporting matrix,o-nitrophenyloctylether (o-NPOE) as solvent mediator and a recently synthesizedHg[dimethylglyoxime(phene)]2+ and Bis-(4-hydroxyacetophenone)-ethylenediamine aselectroactive materials for Hg(II) and Cd(II), respectively. A set of three commercialisedionophores for Cd(II), Pb(II) and Cu(II) has been also used for comparison. Thin-filmmicrosensors based on these membranes showed a Nernstian response of slope(26-30 mV/dec.) for the respective tested cations. The potentiometric responsecharacteristics (linear range, pH range, detection limit and response time) are comparablewith those obtained by conventional membranes as well as coated wire electrodes preparedfrom the same membrane. The realisation of the new organic membrane-based thin-filmmicrosensors overcomes the problem of an insufficient selectivity of solid-state-based thin-film sensors.
ISSN:1424-8220
1424-8220
DOI:10.3390/s6040435