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

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 t...

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Published inThe journal of physical chemistry letters Vol. 8; no. 15; pp. 3668 - 3672
Main Authors Böttcher, Stefan, Vita, Hendrik, Weser, Martin, Bisti, Federico, Dedkov, Yuriy S, Horn, Karsten
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 03.08.2017
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Summary: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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ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.7b01085