Article (Scientific journals)
Au3-Decorated graphene as a sensing platform for O2 adsorption and desorption kinetics.
Libeert, Guillaume; Murugesan, Ramasamy; Guba, Márton et al.
2022In Nanoscale
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Keywords :
General Materials Science
Abstract :
[en] The adsorption and desorption kinetics of molecules is of significant fundamental and applied interest. In this paper, we present a new method to quantify the energy barriers for the adsorption and desorption of gas molecules on few-atom clusters, by exploiting reaction induced changes of the doping level of a graphene substrate. The method is illustrated for oxygen adsorption on Au3 clusters. The gold clusters were deposited on a graphene field effect transistor and exposed to O2. From the change in graphene's electronic properties during adsorption, the energy barrier for the adsorption of O2 on Au3 is estimated to be 0.45 eV. Electric current pulses increase the temperature of the graphene strip in a controlled way and provide the required thermal energy for oxygen desorption. The oxygen binding energy on Au3/graphene is found to be 1.03 eV and the activation entropy is 1.4 meV K-1. The experimental values are compared and interpreted on the basis of density functional theory calculations of the adsorption barrier, the binding energy and the activation entropy. The large value of the activation entropy is explained by the hindering effect that the adsorbed O2 has on the fluxional motion of the Au3 cluster.
Disciplines :
Physics
Author, co-author :
Libeert, Guillaume ;  Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Leuven, Belgium. ewald.janssens@kuleuven.be
Murugesan, Ramasamy ;  Semiconductor Physics Laboratory, Department of Physics and Astronomy, KU Leuven, Leuven, Belgium
Guba, Márton;  Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry and MTA-BME Computation driven research group, Budapest, Hungary
Keijers, Wout;  Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Leuven, Belgium. ewald.janssens@kuleuven.be
Collienne, Simon  ;  Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Raes, Bart;  Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Leuven, Belgium. ewald.janssens@kuleuven.be
Brems, Steven;  Imec, Leuven, Belgium
De Gendt, Stefan;  Imec, Leuven, Belgium ; Division of Molecular Design and Synthesis, Department of Chemistry, KU Leuven, Leuven, Belgium
Silhanek, Alejandro  ;  Université de Liège - ULiège > Département de physique
Höltzl, Tibor ;  Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry and MTA-BME Computation driven research group, Budapest, Hungary ; Furukawa Electric Institute of Technology Ltd., Budapest, Hungary
Houssa, Michel ;  Semiconductor Physics Laboratory, Department of Physics and Astronomy, KU Leuven, Leuven, Belgium ; Imec, Leuven, Belgium
Van de Vondel, Joris ;  Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Leuven, Belgium. ewald.janssens@kuleuven.be
Janssens, Ewald ;  Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Leuven, Belgium. ewald.janssens@kuleuven.be
More authors (3 more) Less
Language :
English
Title :
Au3-Decorated graphene as a sensing platform for O2 adsorption and desorption kinetics.
Publication date :
18 August 2022
Journal title :
Nanoscale
ISSN :
2040-3364
eISSN :
2040-3372
Publisher :
Royal Society of Chemistry (RSC), England
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Horizon 2020 Framework Programme
Funders :
BUTE - Budapesti Műszaki és Gazdaságtudományi Egyetem
MTA - Magyar Tudományos Akadémia
FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen
KU Leuven - Katholieke Universiteit Leuven
EU - European Union
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
Onderzoeksraad, KU Leuven
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