Reference : Gas Sensing with Au-Decorated Carbon Nanotubes
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/101208
Gas Sensing with Au-Decorated Carbon Nanotubes
English
Zanolli, Zeila mailto [Université de Liège - ULg > Département de physique > Physique théorique des matériaux >]
Leghrib, Radouane [> > > >]
Felten, Alexandre [> > > >]
Pireaux, Jean-Jacques [> > > >]
Llobet, Eduard [> > > >]
Charlier, Jean-Christophe [> >]
2011
ACS Nano
American Chemical Society
5
6
4592-4599
Yes (verified by ORBi)
International
1936-0851
1936-086X
Washington
DC
[en] carbon nanotubes ; electronic structure ; quantum transport ; metal nanoparticle decoration ; oxygen plasma treatment ; room temperature gas sensing
[en] The sensing properties of carbon nanotubes (CNTs) decorated with gold nanopar- ticles have been investigated by means of combined theoretical and experimental approaches. On one hand, first-principles and nonequilibrium Green's functions techniques give access to the microscopic features of the sensing mechanisms in individual nanotubes, such as electronic charge transfers and quantum conductances. On the other hand, drop coating deposition of carbon nanotubes decorated with gold nanoparticles onto sensor substrates and their characterization in the detection of pollutants such as NO2, CO, and C6H6 provide insight into the sensing ability of nanotube mats. Using the present combined approaches, the improvement in the detection of some specific gases (NO2 and CO) using Au-functionalized nanotubes is explained. However, for other gases such as C6H6, the Au nanoparticles do not seem to play a crucial role in the sensing process when compared with pristine CNTs functionalized with oxygen plasma. Indeed, these different situations can be explained by identifying the relationship between the change of resistance (macroscopic feature) and the shift of the Fermi level (microscopic feature) after gas adsorption. The understanding of the sensing ability at the atomic level opens the way to design new gas sensors and to tune their selectivity by predicting the nature of the metal that is the most appropriate to detect specific molecular species.
Researchers
http://hdl.handle.net/2268/101208
10.1021/nn200294h
http://pubs.acs.org/doi/abs/10.1021/nn200294h?prevSearch=zanolli&searchHistoryKey=

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
2010_ACSnano_Zanolli_nn200294h.pdfPublisher postprint4.73 MBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.