Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-03-15
Nano Lett. 8; 173-177 (2008) (revised version, there)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures
Scientific paper
10.1021/nl072364w
Graphene, a one-atom thick zero gap semiconductor [1, 2], has been attracting an increasing interest due to its remarkable physical properties ranging from an electron spectrum resembling relativistic dynamics [3-12] to ballistic transport under ambient conditions [1-4]. The latter makes graphene a promising material for future electronics and the recently demonstrated possibility of chemical doping without significant change in mobility has improved graphene's prospects further [13]. However, to find optimal dopants and, more generally, to progress towards graphene-based electronics requires understanding the physical mechanism behind the chemical doping, which has been lacking so far. Here, we present the first joint experimental and theoretical investigation of adsorbates on graphene. We elucidate a general relation between the doping strength and whether or not adsorbates have a magnetic moment: The paramagnetic single NO2 molecule is found to be a strong acceptor, whereas its diamagnetic dimer N2O4 causes only weak doping. This effect is related to the peculiar density of states of graphene, which provides an ideal situation for model studies of doping effects in semiconductors. Furthermore, we explain recent results on its "chemical sensor" properties, in particular, the possibility to detect a single NO2 molecule [13].
Geim Andre K.
Katsnelson Mikhail I.
Lichtenstein Alexander I.
Morozov Sergey V.
Novoselov Kostya S.
No associations
LandOfFree
Molecular Doping of Graphene does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Molecular Doping of Graphene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular Doping of Graphene will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-362982