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

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2017

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Böttcher, Stefan
Vita, Hendrik
Weser, Martin
Bisti, Federico
Horn, Karsten

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https://doi.org/10.1021/acs.jpclett.7b01085
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The Journal of Physical Chemistry Letters. 2017, 8(15), pp. 3668-3672. eISSN 1948-7185. Available under: doi: 10.1021/acs.jpclett.7b01085

Zusammenfassung

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.

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ISO 690BÖTTCHER, Stefan, Hendrik VITA, Martin WESER, Federico BISTI, Yuriy S. DEDKOV, Karsten HORN, 2017. Adsorption of Water and Ammonia on Graphene : Evidence for Chemisorption from X-ray Absorption Spectra. In: The Journal of Physical Chemistry Letters. 2017, 8(15), pp. 3668-3672. eISSN 1948-7185. Available under: doi: 10.1021/acs.jpclett.7b01085
BibTex
@article{Bottcher2017-08-03Adsor-40497,
  year={2017},
  doi={10.1021/acs.jpclett.7b01085},
  title={Adsorption of Water and Ammonia on Graphene : Evidence for Chemisorption from X-ray Absorption Spectra},
  number={15},
  volume={8},
  journal={The Journal of Physical Chemistry Letters},
  pages={3668--3672},
  author={Böttcher, Stefan and Vita, Hendrik and Weser, Martin and Bisti, Federico and Dedkov, Yuriy S. and Horn, Karsten}
}
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