Published January 30, 2014 | Version v1
Journal article Metadata-only

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

Creators

  • 1. SENSOR, Department of Information Engineering, Brescia University, via Valotti, 9, 25133 Brescia (Italy)
  • 2. CNR-INO SENSOR Laboratory, via Branze, 45, 25131 Brescia (Italy)
  • 3. CNR-ISMN, Institute for the Study of Nanostructured Materials, Via dei Taurini, 19, 00185 Roma (Italy)

Description

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.

Availability note (English)

Available from http://dx.doi.org/10.1016/j.apsusc.2013.11.071

Additional details

Identifiers

DOI
10.1016/j.apsusc.2013.11.071;
PII
S0169-4332(13)02149-1;

Publishing Information

Journal Title
Applied Surface Science
Journal Volume
290
Journal Page Range
p. 295-300
ISSN
0169-4332
CODEN
ASUSEE

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
46005114
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ABSORPTION; ARBITRATION; CADMIUM SULFIDES; CARBON MONOXIDE; COMPOSITE MATERIALS; ELECTRIC CONDUCTIVITY; GASES; INTERACTIONS; LAYERS; METALS; NITROGEN DIOXIDE; POLLUTANTS; QUANTUM DOTS; SEMICONDUCTOR MATERIALS; SENSITIVITY; SURFACES; THIN FILMS; TUNGSTEN OXIDES
Descriptors DEC
CADMIUM COMPOUNDS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; ELECTRICAL PROPERTIES; ELEMENTS; FILMS; FLUIDS; INORGANIC PHOSPHORS; MATERIALS; NANOSTRUCTURES; NITROGEN COMPOUNDS; NITROGEN OXIDES; OXIDES; OXYGEN COMPOUNDS; PHOSPHORS; PHYSICAL PROPERTIES; REFRACTORY METAL COMPOUNDS; SORPTION; SULFIDES; SULFUR COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TUNGSTEN COMPOUNDS

Optional Information

Copyright
Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.