Characterization of charge states in conducting organic nanoparticles by X-ray photoemission spectroscopy
Fraxedas, Jordi (Institut Català de Nanociència i Nanotecnologia)
Vollmer, Antje (Helmholtz Zentrum Berlin Materialien & Energie GmbH)
Koch, Norbert (Humboldt University. Institute of Physics)
De Caro, Dominique (Centre national de la recherche scientifique (França). Laboratoire de Chimie de Coordination)
Jacob, Kane (Centre national de la recherche scientifique (França). Laboratoire de Chimie de Coordination)
Faulmann, Christophe (Centre national de la recherche scientifique (França). Laboratoire de Chimie de Coordination)
Valade, Lydie (Centre national de la recherche scientifique (França). Laboratoire de Chimie de Coordination)

Date:	2021
Abstract:	The metallic and semiconducting character of a large family of organic materials based on the electron donor molecule tetrathiafulvalene (TTF) is rooted in the partial oxidation (charge transfer or mixed valency) of TTF derivatives leading to partially filled molecular orbital-based electronic bands. The intrinsic structure of such complexes, with segregated donor and acceptor molecular chains or planes, leads to anisotropic electronic properties (quasi one-dimensional or two-dimensional) and morphology (needle-like or platelet-like crystals). Recently, such materials have been synthesized as nanoparticles by intentionally frustrating the intrinsic anisotropic growth. X-ray photoemission spectroscopy (XPS) has emerged as a valuable technique to characterize the transfer of charge due to its ability to discriminate the different chemical environments or electronic configurations manifested by chemical shifts of core level lines in high-resolution spectra. Since the photoemission process is inherently fast (well below the femtosecond time scale), dynamic processes can be efficiently explored. We determine here the fingerprint of partial oxidation on the photoemission lines of nanoparticles of selected TTF-based conductors.
Grants:	European Commission 226716 Ministerio de Economía y Competitividad PGC2018-095032-B-100 Ministerio de Economía y Competitividad SEV-2017-0706
Note:	Altres ajuts: the ICN2 is funded by the CERCA program/Generalitat de Catalunya
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Conducting nanoparticles ; Tetrathiafulvalene ; Bis(ethilenedithio)tetrathiafulvalene ; Charge-transfer complexes ; Mixed-valence materials ; X-ray photoemission spectroscopy ; Synchrotron radiation
Published in:	Materials, Vol. 14, issue 8 (April 2021) , art. 2058, ISSN 1996-1944

DOI: 10.3390/ma14082058
PMID: 33921815

13 p, 15.9 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles