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Semi-conducteurs: Graphène, Grand gap & Photovoltaïque
(4) Production(s) de l'année 2024
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BaCoO 2 with Tetrahedral Cobalt Coordination: The Missing Element to Understand Energy Storage and Conversion Applications in BaCoO 3−δ -Based Materials 
Auteur(s): Diatta Aliou, Colin Claire, Viennois Romain, Beaudhuin Mickael, Haines Julien, Hermet P., van der Lee Arie, Konczewicz L., Armand Pascale, Rouquette Jérôme
(Article) Publié:
Journal Of The American Chemical Society, vol. 146 p.15027-15035 (2024)
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High-Order Commensurate Zwitterionic Quinonoid Phase Induces a Nanoscale Dipole Lattice on Graphene
Auteur(s): Nassar Gaelle, Cortés-Arriagada Diego, Sanhueza-Vega Luis, Landois P., Paillet M., Hrich H., Contreras S., Siri Olivier, Pascal Simon, Masson Laurence, Becker Conrad, Ranguis Alain, Parret R., Canard Gabriel, Leoni Thomas
(Article) Publié:
The Journal Of Physical Chemistry C, vol. p. (2024)
Ref HAL: hal-04609427_v1
DOI: 10.1021/acs.jpcc.4c01695
Exporter : BibTex | endNote
Résumé: Since the introduction of hybrid van der Waals heterostructures (h-vdWHs) for device architecture development, many vertically staked organic two-dimensional materials have been investigated in order to control transport properties. This article introduces a novel h-vdWH that achieves periodicinteraction by the development of a superlattice. We describe a complete investigation of the diphenyl-functionalized p-benzoquinonemonoimine zwitterion on highly oriented pyrolytic graphiteand monolayer graphene using high-resolution scanning tunneling microscopy images and numerical simulations. The molecular phase on both substrates exhibits a structurally identical antiparallel dipole alignment in a head-to-tail dimer configuration. Density functional theory calculations reveal that this molecularadsorption induces a local dipole at the graphene interface due to the rearrangement of the electron density distribution.
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Contactless Measurement for Quantum Phenomenon Studies in Graphite
Auteur(s): Coillot C.
(Document sans référence bibliographique)
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A new approach combining microwave heat pulse and infrared thermography for non-invasive portable sap flow velocity measurement
Auteur(s): Louche Hervé, Pénarier Annick, Clair Bruno, Nouvel Philippe, Coillot C., Do Frederic
(Article) Publié:
Agricultural And Forest Meteorology, vol. 347 p.109896 (2024)
Texte intégral en Openaccess : 
Ref HAL: hal-04445925_v1
DOI: 10.1016/j.agrformet.2024.109896
Exporter : BibTex | endNote
Résumé: Xylem sap flow measurement is a key method to quantify plant water use and assess the responses to environmental conditions and climatic change. However, available methods are generally invasive and of limited portability. This paper presents a non-invasive approach called TIMFLOW that combines microwave heat pulse and infrared thermography, while having a high portability and versatility potential. The methodology was tested in laboratory conditions for black poplar (Populus nigra) stems of various diameters (10–45 mm) and for the known sap flow velocity range (10–100 cm h−1). The heat pulse was generated by microwaves with a power amplifier supplying a bi-quad antenna at 2.45 GHz frequency located near the stem. The scene was filmed using a relatively low-cost light and compact InfraRed (IR) thermography camera. A stem temperature map was used to determine the heat pulse propagation velocity. The calculated heat velocity was highly correlated with the applied flow velocity with a unique relationship regardless of the diameter. The latter result confirms the equation of Marshall (1958) which links the sap velocity to the heat velocity with a vessel fraction of around 25 % within samples. The feasibility of outdoor measurements was also successfully tested. The assumed potentials and limitations of the proposed methodology are discussed. In summary, the study demonstrates the concept and validates, in woody stems, this new methodology for non-invasive portable sap flow velocity measurement.
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