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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in atti di convegno anno 2017

Contributo in atti di convegno

Tipo: Presentazione

Titolo: CdSe/ZnS-TiO2 nanofibers: a suitable combination for a low cost and effective sensor device

Anno di pubblicazione: 2017

Formato: Elettronico

Autori: Viviana Perri, Emiliano Zampetti, Barbara Richichi, Nicola Pirrone, Fabrizio De Cesare, Antonella Macagnano

Affiliazioni autori: Viviana Perri, Emiliano Zampetti, Barbara Richichi, Nicola Pirrone, Fabrizio De Cesare, Antonella Macagnano

Autori CNR:


Lingua: inglese

Abstract: From recent literature [1], electrospinning results to be one of the best tools, among the various nanotechnologies, for designing and developing smart sensing systems, both for the uniqueness of the resulting nanostructures and for production rate and cost. The use of electrospun fibers in photonics is a promising research field aimed at developing novel microscale optical sensors, that are generally appreciated for their high sensitivity, fast response time and low power consumption. Recently, very effective electrospun fluorescent fibers have been realized by using transparent or optically inert polymers properly doped with inorganic quantum dots [2]. The advantages of QDs over the traditional fluorescent molecules include high intensity of emission, good photostability, and long fluorescence lifetime. In the present study, titania nanofibrous layers decorated with fluorescent core/shell nanoparticles (QDs) have been designed ad investigated as potential optical sensors for detecting toxic gases in air (e.g. NH3). Initially, fluorescent (CdSe)ZnS core-shell quantum dots were synthesized, according to literature, [3] and then used to decor titania nanofibres according two strategies: the first one by drop-casting, the second one by chemical functionalization in situ. Their different arrangements over the fibres were characterized by AFM (Atomic Force Microscopy) and HR-TEM (High-Resolution Transmission Electron Microscopy), and their optical performances were investigated by spectrophotometry and spectrofluorometry as well as fluorescence microscopy. A very low cost and compact sensing device was designed and implemented (by a 3D-printer) to irradiate fibres (low power LED: 390 nm; 5 mW) and capture images (Raspicam digital camera). The luminance (PL) changes of the samples, before and after gas exposure, were measured through a developed software (by using Python). Effects of relative humidity and temperature were investigated too.

Lingua abstract: inglese

Pagine da: INV2

Titolo del volume: ElectrospinCY2017 - Libro degli Abstract

Referee: Ś: Internazionale

Stato della pubblicazione: Published version

Parole chiave:

  • QDs
  • optical sensors
  • nanofibers electrospinning
  • hybrid materials

Congresso nome: ElectrospinCY2017

Congresso luogo: New Campus of the University of Cyprus, Nicosia - Cyprus

Congresso data: 19-21 Aprile 2017

Congresso rilevanza: Internazionale

Congresso relazione: Su invito

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