Quantum dots as mediators in gas sensing: A case study of CdS sensitized WO3 sensing composites

Anno: 2014

Autori: Concina I., Comini E., Kaciulis S., Sberveglieri G.

Affiliazione autori: CNR, INO SENSOR Lab, I-25131 Brescia, Italy; Univ Brescia, Dept Informat Engn, SENSOR, I-25133 Brescia, Italy; CNR, ISMN, I-00185 Rome, Italy.

Abstract: In this study the proof of principle of the use of naked semiconductor directly generated on metal oxide surface as mediators in gas sensing is provided. Successive ionic layer absorption and reaction (SILAR) technique has been applied to sensitize a WO3 thin film with CdS quantum dots. Response to gases of bare WO3 is deeply modified: quantum dots dramatically increase the metal oxide conductance, otherwise rather poor, and modify the capability of detecting environmental pollutants, such as CO and NO2. A modified sensing mechanism is proposed to rationalize the mediation exerted by the semiconducting active layer on the interaction between gaseous species and WO3 surface. (C) 2013 Elsevier B. V. All rights reserved.

Giornale/Rivista: APPLIED SURFACE SCIENCE

Volume: 290      Da Pagina: 295  A: 300

Maggiori informazioni: Region Lombardia under the project X-Nano (Emettitori di elettroni a base di nano tubi di carbonio e nano strutture di ossidi metallici quasi monodimensionale per lo sviluppo di sorgenti a raggi X) is acknowledged for partial funding. The work has been supported by the Italian MIUR through the FIRB Project RBAP115AYN Oxides at the nanoscale: multifunctionality and applications.
Parole chiavi: Chemical gas sensors; CdS quantum dots; SILAR technique
DOI: 10.1016/j.apsusc.2013.11.071

Citazioni: 3
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