Consiglio Nazionale delle Ricerche

Tipo di prodottoArticolo in rivista
TitoloLow-Concentration Ethanol Vapor Sensing With Nanostructured Porous Silicon Interferometers Using Interferogram Average Over Wavelength Reflectance Spectroscopy
Anno di pubblicazione2018
Autore/iMariani, Stefano; Strambini, Lucanos M.; Paghi, Alessandro; Barillaro, Giuseppe
Affiliazioni autoriIEIIT-CNR; Università di Pisa
Autori CNR e affiliazioni
  • inglese
AbstractHerein, we report low-concentration ethanol vapor detection with nanostructured porous silicon (PSi) interferometers using interferogram average over wavelength reflectance spectroscopy (IAWRS), a novel interferometric technique recently developed for ultrasensitive (bio)sensing applications in liquid using miniaturized integrated interferometers. Ethanol vapors at concentrations of 100, 500, and 1000 ppm (in synthetic dry air) are reliably monitored in real-time using IAWRS by monitoring changes on the reflectance spectrum of PSi interferometers after ethanol physisorption onto the nanopore surface. Good signal-to-noise ratio, high sensitivity, and low resolution are achieved at any of the tested concentrations, leading to a theoretical detection limit (DL) of 0.9 ppm. Fast response times of a few tens of seconds are estimated from time-resolved sensorgrams, both for adsorption and desorption, which confirm that physisorption takes place into the nanopores. Capillary condensation of ethanol in the pores of our PSi interferometers is further ruled out using the Kelvin theory, at least at the concentrations tested in this paper. These results represent a remarkable improvement compared to the state-of-the-art literature on gas/vapor optical sensing using nanostructured PSi, according to which sub-ppm DLs can only be achieved exploiting either capillary condensation in the nanopores or through the assembling PSi-polymer composites.
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Altro abstract-
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Pagine da7842
Pagine a7849
Pagine totali8
RivistaIEEE sensors journal
Attiva dal 2001
Editore: IEEE Sensors Council, - New York, NY
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 1530-437X
Titolo chiave: IEEE sensors journal
Titolo proprio: IEEE sensors journal.
Titolo abbreviato: IEEE sens. j.
Titoli alternativi:
  • Sensors journal
  • Institute of Electrical and Electronics Engineers sensors journal
Numero volume della rivista18
Fascicolo della rivista19
Verificato da referee-
Stato della pubblicazionePublished version
Indicizzazione (in banche dati controllate)
  • ISI Web of Science (WOS) (Codice:000444832100012)
Parole chiaveDetection limit (DL), ethanol vapors, interferogram average over wavelength reflectance spectroscopy (IAWRS), gas sensing, interferometry, porous silicon (PSi) interferometer, resolution, vapor sensing
Link (URL, URI)-
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Data di accettazione-
Note/Altre informazioni-
Strutture CNR
  • IEIIT — Istituto di elettronica e di ingegneria dell'informazione e delle telecomunicazioni
Moduli CNR
    Progetti Europei-