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SWCNT nano-composite optical sensors for VOC and gas trace detection

TitleSWCNT nano-composite optical sensors for VOC and gas trace detection
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2009
AuthorsConsales, M., Crescitelli A., Penza Michele, Aversa Patrizia, Veneri P.D., Giordano M., and Cusano A.
JournalSensors and Actuators, B: Chemical
Volume138
Pagination351-361
ISSN09254005
KeywordsCadmium, Carbon carbon composites, Carbon fibers, Carbon nanotubes, Chemo-sensors, Composite coatings, Deposition techniques, Electrodeposition, Fabry-Perot interferometers, Fiber optic sensors, Fiber surfaces, Fibers, Gas exposures, Langmuir-Blodgett deposition techniques, Metallic matrix composites, Morphological characterizations, Nano-composite coatings, Nanocomposites, Nanosensors, Operating conditions, Optical fiber fabrication, Optical fiber sensors, Optical fibers, Optical materials, Optical microscopy, Optical probes, Optical sensors, Optical transducers, Part per billions (ppb), Reflectance measurements, Room temperature chemical detection, Scanning electron microscopy, Sensing performance, Sensitive coatings, Single-walled carbon nanotubes (SWCN), Trace analysis, Trace detections, Transducers, Volatile organic compounds, Water environments
Abstract

The feasibility of exploiting novel chemo-sensitive coatings based on cadmium arachidate (CdA)/single-walled carbon nanotube (SWCNT) composites for the development of high performance optical chemo-sensors has been experimentally investigated and proved. SWCNT nano-composite overlays have been transferred on the distal end of standard optical fibers by the Langmuir-Blodgett deposition technique in order to realize extrinsic low-finesse Fabry-Perot interferometers. A structural and morphological characterization of the fabricated optical probes has been carried out by scanning electron microscopy observations and Raman spectroscopy analysis. Reflectance measurements have been carried out to test the sensing performance of the proposed devices to volatile organic compound (VOC) and gas exposure. Also, VOC trace detection has been evaluated in different environments, such as air and water. Obtained results have also been compared in the same operating conditions to those obtained in the case of standard SWCNT overlays deposited by using the same deposition technique and optical transducers in order to outline the effect of the nano-composite matrix both on the material integration effectiveness and sensing performance. The results shown here demonstrate that the use of nano-composite coatings not only promotes a better adhesion of the sensitive overlay to the fiber surface, thus improving the robustness of the chemo-optical sensors, but also significantly enhances their sensitivities from three to seven times with respect to the SWCNT overlay directly deposited on the fiber surface. Moreover, resolutions in the range 30-250 part per billion (ppb) and 0.6-1.5 part per million (ppm) have been estimated in case of air and water environments, respectively. © 2009 Elsevier B.V. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-63749099038&doi=10.1016%2fj.snb.2009.02.041&partnerID=40&md5=07f97d197a50be5ee89f6a13502ae700
DOI10.1016/j.snb.2009.02.041
Citation KeyConsales2009351