Article (Scientific journals)
Carbon nanotubes randomly decorated with gold clusters: from nano(2)hybrid atomic structures to gas sensing prototypes
Charlier, Jean-Christophe; Arnaud, L.; Avilov, I. V. et al.
2009In Nanotechnology, 20 (37)
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Keywords :
carbon nanotube; ab initio modelling; gas sensing
Abstract :
[en] Carbon nanotube surfaces, activated and randomly decorated with metal nanoclusters, have been studied in uniquely combined theoretical and experimental approaches as prototypes for molecular recognition. The key concept is to shape metallic clusters that donate or accept a fractional charge upon adsorption of a target molecule, and modify the electron transport in the nanotube. The present work focuses on a simple system, carbon nanotubes with gold clusters. The nature of the gold–nanotube interaction is studied using first-principles techniques. The numerical simulations predict the binding and diffusion energies of gold atoms at the tube surface, including realistic atomic models for defects potentially present at the nanotube surface. The atomic structure of the gold nanoclusters and their effect on the intrinsic electronic quantum transport properties of the nanotube are also predicted. Experimentally, multi-wall CNTs are decorated with gold clusters using (1) vacuum evaporation, after activation with an RF oxygen plasma and (2) colloid solution injected into an RF atmospheric plasma; the hybrid systems are accurately characterized using XPS and TEM techniques. The response of gas sensors based on these nano2hybrids is quantified for the detection of toxic species like NO2, CO, C2H5OH and C2H4.
Disciplines :
Physics
Author, co-author :
Charlier, Jean-Christophe;  Université Catholique de Louvain
Arnaud, L.
Avilov, I. V.
Delgado, M.
Demoisson, F.
Espinosa, E. H.
Ewels, C. P.
Felten, A.
Guillot, J.
Ionescu, R.
Leghrib, R.
Llobet, E.
Mansour, A.
Migeon, H.-N.
Pireaux, J.-J.
Reniers, F.
Suarez-Martinez, I.
Watson, G. E.
Zanolli, Zeila ;  Université Catholique de Louvain
More authors (9 more) Less
Language :
English
Title :
Carbon nanotubes randomly decorated with gold clusters: from nano(2)hybrid atomic structures to gas sensing prototypes
Publication date :
2009
Journal title :
Nanotechnology
ISSN :
0957-4484
eISSN :
1361-6528
Publisher :
Institute of Physics
Volume :
20
Issue :
37
Peer reviewed :
Peer Reviewed verified by ORBi
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