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Carbon nanotube films as a platform to transduce molecular recognition events in metalloporphyrins

TitoloCarbon nanotube films as a platform to transduce molecular recognition events in metalloporphyrins
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2011
AutoriPenza, Michele, Alvisi Marco, Rossi R., Serra Emanuele, Paolesse R., D'Amico A., and Di Natale C.
RivistaNanotechnology
Volume22
ISSN09574484
Parole chiaveAcetates, acetic acid derivative, acetic acid ethyl ester, Acetone, Adsorbate molecules, Adsorbed molecules, Adsorption, Array configurations, article, Biosensing Techniques, carbon, Carbon films, carbon nanotube, Carbon nanotube films, Carbon nanotubes, Carbon structures, Catalytic effects, Charge transfer, Chemical features, chemical structure, Chemiresistors, chemistry, Electric Impedance, Electric properties, Equipment Design, evaluation, Functional materials, furan derivative, Furans, genetic procedures, impedance, instrumentation, Ion exchange, metalloporphyrin, Metalloporphyrins, Methanol, Models, Molecular, molecular biology, Molecular recognition, Molecular recognition systems, Nanotubes, Porphyrin films, Porphyrins, Resistance change, Sensing property, Sensitivity and Specificity, Sensor arrays, tetrahydrofuran, transducer, Transducers, Transducing, Ultrastructure, Volatile compounds, Volatile organic compounds
Abstract

Porphyrins have been widely used for many years as functional materials for chemical sensors. Their outstanding chemical features are balanced by some restrictions in terms of transduction techniques. In particular, porphyrin layers are barely conductive, with the consequence that the fabrication of porphyrin based chemiresistors is not possible, except in few rare cases. On the other hand, carbon nanotubes (CNTs) have superior electric properties ranging from metallic to semiconductor in character. Although the conductivity of CNTs is very sensitive to adsorbed molecules, it should be considered that the adsorption onto carbon structures is also scarcely selective and cannot be modified unless other molecular recognition systems are coupled with the CNTs. Following this approach, in this paper we investigated the sensing properties of hybrid CNT-porphyrin films to explore the possibility of transducing the adsorption events occurring in a porphyrin layer into resistance changes of the CNT layers. The results obtained indicate that the presence of the porphyrin films increases the sensitivity of the electric resistance of the CNTs to the concentration of volatile compounds. This enhancement is probably due to the catalytic effect of the metalloporphyrin in conveying the charge transfer from the adsorbate molecule to the CNTs substrate. This property of metalloporphyrins may introduce a further differentiation between porphyrin based sensors that could be positively utilized in sensor array configurations. © 2011 IOP Publishing Ltd Printed in the UK & the USA.

Note

cited By 10

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-79951840109&doi=10.1088%2f0957-4484%2f22%2f12%2f125502&partnerID=40&md5=9867da1a65acb831c05aa5151599cf30
DOI10.1088/0957-4484/22/12/125502
Citation KeyPenza2011