Dichalcogenides; Electro actives; Ferrocenes; Ferrocenyl; Functionalized; Redox active molecules; Redox state; Spin transport; Switchable; V/V; Electronic, Optical and Magnetic Materials; Energy (all); Physical and Theoretical Chemistry; Surfaces, Coatings and Films; Physics - Materials Science; Physics - Mesoscopic Systems and Quantum Hall Effect; physics.app-ph
Abstract :
[en] The attachment of redox-active molecules to transition metal dichalcogenides, such as MoS2, constitutes a promising approach for designing electrochemically switchable devices through the control of the material’s charge/spin transport properties by the redox state of the grafted molecule and thus the applied electrical potential. In this work, defective plasma-treated MoS2 is functionalized by a ferrocene derivative and thoroughly investigated by various characterization techniques, such as Raman, photoluminescence, and X-ray photoelectron spectroscopies; atomic force microscopy (AFM); and electrochemistry. Furthermore, in-plane and out-of-plane conductive AFM measurements (I-V and first derivative ∂I/∂V-V curves) are measured to investigate the effect of the chemical functionalization of MoS2 on the electron transport properties. While the conduction and valence bands are determined at +0.7 and −1.2 eV with respect to the electrode’s Fermi energy for pristine MoS2, additional states in an energy range of ≈0.45 eV below the MoS2 conduction band are measured after plasma treatment, attributed to S-vacancies. For ferrocene-functionalized MoS2, the S-vacancy states are no longer observed, resulting from the defect healing. However, two bumps at lower voltages in the ∂I/∂V-V indicate a contribution to electron transport through ferrocene’s highest occupied molecular orbital, which is located in the MoS2 band gap at ≈0.4/0.6 eV below the Fermi energy. These results are in good agreement with theoretical density functional theory calculations and UV photoelectron spectroscopy measurements.
Disciplines :
Physics Chemistry
Author, co-author :
Nguyên Lê, Trung Nghia; CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR6226, Univ Rennes, Rennes, France
Kondratenko, Kirill; Institute for Electronics Microelectronics and Nanotechnology (IEMN), CNRS, University of Lille, Lille, France
Arbouch, Imane ; Université de Mons - UMONS > Faculté des Sciences > Service de Chimie des matériaux nouveaux
Moréac, Alain; CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Univ Rennes, Rennes, France
Breton, Jean-Christophe Le; CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Univ Rennes, Rennes, France
Van dyck, Colin ; Université de Mons - UMONS > Faculté des Sciences > Service Chimie Physique Théorique
Cornil, Jérôme ; Université de Mons - UMONS > Faculté des Sciences > Service de Chimie des matériaux nouveaux
Vuillaume, Dominique ; Institute for Electronics Microelectronics and Nanotechnology (IEMN), CNRS, University of Lille, Lille, France
Fabre, Bruno ; CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR6226, Univ Rennes, Rennes, France
Language :
English
Title :
Electronic Properties of Electroactive Ferrocenyl-Functionalized MoS2
Publication date :
09 May 2024
Journal title :
Journal of Physical Chemistry. C, Nanomaterials and interfaces
The authors gratefully acknowledge ANR (Agence Nationale de la Recherche) for financial support of the ECOTRAM program (ECOTRAM, grant no. ANR-20-CE09-0018-01). T.N.N.L. is grateful to ANR for the funding of his Ph.D. The XPS measurements have been performed on the ASPHERYX platform (ScanMAT, UAR 2025, University of Rennes-CNRS; CPER-FEDER 2015-2020). S. Ababou-Girard (Institut de Physique de Rennes, UMR6251, France) is fully acknowledged for some preliminary XPS measurements. The \u03BC-Raman and \u03BC-Photo-Luminescence measurements have been performed on the SIR platform (ScanMAT, UAR 2025, University of Rennes-CNRS). The computational resources were provided by the Consortium des \u201CEquipements de Calcul Intensif\u201D (CE\u0301CI), funded by the Belgian National Fund for Scientific Research (F.R.S.-FNRS) under Grant 2.5020.11. J.C. is an FNRS Research Director.
Commentary :
Full manuscript with figures and supporting information
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