http://www.cnr.it/ontology/cnr/individuo/prodotto/ID302173
Discrimination of mercuric ions in piezoelectric sensors with a conjugated polymeric active layer (Articolo in rivista)
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- Label
- Discrimination of mercuric ions in piezoelectric sensors with a conjugated polymeric active layer (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1166/jnn.2014.9347 (literal)
- Alternative label
Giancane G.; Bettini S.; Pagano R.; Operamolla A.; Hassan Omar O; Babudri F.; Farinola G.M.; Valli L. (2014)
Discrimination of mercuric ions in piezoelectric sensors with a conjugated polymeric active layer
in Journal of nanoscience and nanotechnology (Print); American Scientific Publishers, Los Angeles (Stati Uniti d'America)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Giancane G.; Bettini S.; Pagano R.; Operamolla A.; Hassan Omar O; Babudri F.; Farinola G.M.; Valli L. (literal)
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- http://www.scopus.com/inward/record.url?eid=2-s2.0-84907202601&partnerID=q2rCbXpz (literal)
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- Department of Cultural Heritage, University of Salento, Via Birago 64, Lecce, I-73100, Italy; Department of Biological and Environmental Sciences and Technologies, DISTEBA, University of Salento, Via per Arnesano, Lecce, I-73100, Italy; Dipartimento di Chimica, Università Degli Studi di Bari Aldo Moro, via Orabona 4, Bari, I-70126, Italy; CNR-ICCOM Istituto di Chimica Dei Composti Organometallici, via Orabona 4, Bari, I-70126, Italy (literal)
- Titolo
- Discrimination of mercuric ions in piezoelectric sensors with a conjugated polymeric active layer (literal)
- Abstract
- The synthetic conjugated poly(1, 4-arylene-2, 5-thienylene) containing benzo[c][2,1,3]thiadiazole
monomeric units (Bz-PAT) is proposed as active layer for the selective detection of mercuric ions. The
Bz-PAT polymer chemical structure induces the formation of a disordered film with numerous vacancies
and the size of these defects could be exploited for a reversible trapping of mercuric ions. For these
reasons the Langmuir-Schaefer (LS) deposition method has been employed for transferring Bz-PAT
layers with the desired accurate bi-dimensional organization control of the layer and with a high control
of the deposition parameters. In this contribution, the frequency variation of a quartz crystal microbalance
with 10, 20, 30 and 40 LS runs of Bz-PAT has been investigated in response to the injection of aqueous
solutions of HgCl2, Pb(NO3)2, NiCl2, CdCl2 and ZnSO4 at different concentrations (0.5 mM, 1 mM, 5
mM). An almost linear dependence on the number of the LS layers and hence on the film thickness,
measured by means of ellipsometric spectroscopy, has been found in terms of sensor response to
concentration of Hg2+ ions fluxed. By means of UV-Vis spectroscopy, the variations in the ?-?*
absorption band of the polymer, attributed to the thiophene segment, induced by HgCl2 injection has been
analyzed and explained as a consequence of the electron transfer from the mercuric ion to the polymer
solid film. These results, together with the linear relation found between the number of deposited layers
and LS film thickness, suggest that the sensing mechanism can be explained both by an electron
interaction active layer and analyte and a diffusion mechanism of Hg2+ into the solid film that reaches an
asymptotic value at 30 runs (about 80 nm), then a higher number of layers does not influence the sensor
sensibility. (literal)
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