Hybrid titania–zincphthalocyanine nanostructured multilayers with novel gas sensing properties

Gas sensors based on hybrid ZnPc–TiO 2 nanostructures, produced by molecules and clusters both deposited by supersonic beams, demonstrate enhanced properties in terms of sensitivity, stability and recovery times with respect to pure ZnPc. The hybrid sensors produced by successive deposition of the m...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2008-03, Vol.130 (1), p.405-410
Main Authors: Siviero, F., Coppedè, N., Taurino, A.M., Toccoli, T., Siciliano, P., Iannotta, S.
Format: Article
Language:English
Subjects:
Clusters
Deposition
Gas sensors
Hybrid nanostructures
Nanocomposites
Nanomaterials
Nanostructure
Sensors
Supersonic molecular and cluster beams
TiO 2
Titanium dioxide
ZnPc
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Summary:Gas sensors based on hybrid ZnPc–TiO 2 nanostructures, produced by molecules and clusters both deposited by supersonic beams, demonstrate enhanced properties in terms of sensitivity, stability and recovery times with respect to pure ZnPc. The hybrid sensors produced by successive deposition of the molecules and the TiO 2 clusters show the ability to detect reducing gases, such as methanol, to which the response of metal-phthalocyanines is quite poor. A mechanism based on the formation of chemical bonding, activated by the kinetic energy of the molecules and the strong reactivity of the inorganic clusters, is proposed as being at the basis of electron transfer occurring between the inorganic nanostructure and the molecule. This mechanism would explain the rise of new gas sensing properties of this novel class of nano-hybrid materials.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2007.09.005