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Carbon nanotubes coated acoustic and optical VOCs sensors: Towards the tailoring of the sensing performances

TitoloCarbon nanotubes coated acoustic and optical VOCs sensors: Towards the tailoring of the sensing performances
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2007
AutoriConsales, M., Cutolo A., Penza Michele, Aversa Patrizia, Cassano Gennaro, Giordano M., and Cusano A.
RivistaIEEE Transactions on Nanotechnology
Volume6
Paginazione601-611
ISSN1536125X
Parole chiaveCarbon nanotubes, Langmuir Blodgett films, LB deposition, Nanostructured materials, Optical detection, Optical fiber VOC sensors, Optical fibers, Optical sensors, QCM acoustic VOC sensors, Quartz crystal microbalances, Silica optical fibers, Vapors testing, Volatile organic compounds
Abstract

This work is focused on the room temperature sensitivities and response times analysis against aromatic volatile organic compounds of both silica optical fiber and quartz crystal microbalance sensors, coated by Single-walled Carbon Nanotubes Langmuir-Blodgett multilayers as highly sensitive nanomaterials. The fabricated samples have been characterized by means of X-ray diffraction, high-resolution transmission electron microscopy and scanning electron microscopy, SOF and QCM transducers have been simultaneously exposed at room temperature to toluene and xylene individual vapors in the ppm range. For each transducer type, a time division multiplexing approach has been carried out, enabling the simultaneous interrogation of up to 8 optical and 6 acoustic probes, respectively. The results obtained indicate that both optical and acoustic sensors provide very high reproducibility and sensitivity either towards toluene or xylene, with a resolution of few hundreds of ppb. Furthermore, sensitivities and response times have been found to be dependent on the particular analytes used for the vapors testing. Both transducer types demonstrate a similar response time, while with regard the recovery time, the optical detection seems to be significantly faster than the electrical counterpart. The effect of the SWCNTs monolayers number on sensors sensitivity and response time has been also investigated, demonstrating the possibility to enhance the performances of the proposed transducers by tailoring the geometric properties of the sensitive nanomaterial.

Note

cited By 23

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-36348939976&doi=10.1109%2fTNANO.2007.907843&partnerID=40&md5=c0825047722fba077e3ccae81dd72ff7
DOI10.1109/TNANO.2007.907843
Citation KeyConsales2007601