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Sensori Chimici in Fibra Ottica basati su Nanotubi di Carbonio

(1) : University of Sannio, Optoelectronic Division -Engineering Department, Benevento - Italy. (2) : Department for Technologies, University Parthenope, Napoli, Italy. (3) : ENEA, Materials and New Technologies, CR Brindisi, Brindisi - Italy.

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Sensori Chimici in Fibra Ottica basati su Nanotubi di Carbonio

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  1. (1): University of Sannio, Optoelectronic Division -Engineering Department, Benevento - Italy. (2): Department for Technologies, University Parthenope, Napoli, Italy (3): ENEA, Materials and New Technologies, CR Brindisi, Brindisi - Italy. (4): Institute for Composite and Biomedical Materials, CNR, Napoli, Italy. Sensori Chimici in Fibra Otticabasati su Nanotubi di Carbonio M. Consales1, M. Pisco1, S.Campopiano2, A. Cutolo1, M. Penza3, P. Aversa3, M. Giordano4, A. Cusano1 POSTER # A27

  2. Silica Optical Fiber (SOF) Sensors For an important number of environmental monitoring and industrial applications fiber-optic sensor technology offers several advantages for significant metrological improvement through: • High sensitivity • Immunity to electromagnetic interference • Safety in the corrosive environments • Fast response This technology is suitable for distributed measurements and it is, by definition, compatible with the fiber-optic communication networks The scientific community is interested in: New devices able to provide high performance sensing mechanism and multiplexing capability.

  3. ΔRfilm=f (ΔεFilm , ΔdFilm) • Rfilm is the fiber-film reflectance • εSWCNTs= ε1+jε2 is the dielectric constant of the film • dSWCNTs is the film thickness Principle of Operation When the optical probe is exposed to a target analyte, its molecules are adsorbed within the sensitive layer, changing its thickness and complex dielectric function and thus the optical signal reflected at the fiber film interface.

  4. Why Single-Walled Carbon Nanotubes (SWCNTs)? Carbon nanotubes are basically sheets of graphite rolled up into a tube to form a cylinder. • Peculiar hollow structure • Diameters in the range 1-10 nm • High specific surface area (100-1800 m2/g) • Particular interactions between carbon atoms and gas molecules

  5. Langmuir-Blodgett (LB) deposition technique HiPco SWCNTs (purchased by CNI) films have been deposited monolayer by monolayer by successively dipping the substrates up and down through the monolayer

  6. SEM image of SWCNTs bundles HRTEM image of SWCNTs bundles XRD from SWCNTs powder HRTEM image of SWCNTs bundles Low magnification High magnification Structural and morphological CNTs characterization • Mean rope diameter: 1-40 nm • Mean rope length: 2-15 µm • Monolayers spacing ~ 2.0 nm

  7. Volatile Organic Compounds (VOCs) detection Standard Silica Optical Fiber coated by 4 monolayers of SWCNTs (approx. 8nm) TOLUENE VAPORS Resolution of approx. 290 ppb Response times (10%-90%) of approx. 9 minutes Recovery times (90%-10%) of approx. 5 minutes XYLENE VAPORS Resolution of approx. 120 ppb Response times (10%-90%) of approx. 11 minutes Recovery times (90%-10%) of approx. 6 minutes Response of a Carbon Nanotubes based SOF sensor to different concentrations of (a) toluene and (b) xylene vapors, at room temperature.

  8. Images of a photonic band-gap optical fiber without and with SWCNTs Response of the photonic band-gap fiber based sensor to three decreasing concentration of THF vapors, at room temperature. Hollow-core Optical Fibers (HOFs) based chemical sensors HOF coated by 20 monolayers of SWCNTs for TetraHydroFuran (THF) vapors detection

  9. Response of a Carbon Nanotubes based optical fiber sensor to two different concentration of gaseous hydrogen, at -160°C. Hydrogen Detection at Criogenic Temperatures

  10. THANKS FOR YOUR ATTENTION

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