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Adsorption of Water and Ammonia on Graphene: Evidence for Chemisorption from X-ray Absorption Spectra

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons21385

Böttcher,  Stefan
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
SPECS Surface Nano Analysis GmbH;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22200

Vita,  Hendrik
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22234

Weser,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21451

Dedkov,  Yuriy
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Fachbereich Physik, Universität Konstanz;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21640

Horn,  Karsten
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Böttcher, S., Vita, H., Weser, M., Bisti, F., Dedkov, Y., & Horn, K. (2017). Adsorption of Water and Ammonia on Graphene: Evidence for Chemisorption from X-ray Absorption Spectra. The Journal of Physical Chemistry Letters, 8(15), 3668-3672. doi:10.1021/acs.jpclett.7b01085.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-CC7F-F
Abstract
While the bonding of molecular adsorbates to graphene has so far been characterized as physisorption, our study of adsorbed ammonia and water using near-edge X-ray absorption spectroscopy provides unambiguous evidence for a chemical contribution to the adsorption bond. We use the situation, unique to graphene, to characterize the unoccupied valence band states of the partners in the bond on the basis of the complementary adsorbate and substrate X-ray absorption K edges. New adsorbate-induced features on the substrate (carbon) K edge are interpreted as hybrid states in terms of a simple model of chemical interaction.