Autores: Tobias Junghoefer, Ewa Malgorzata Nowik-Boltyk, J. Alejandro de Sousa, Erika Giangrisostomi, Ruslan Ovsyannikov, Thomas Chassé, Jaume Veciana, Marta Mas-Torrent, Concepció Rovira, Núria Crivillers and Maria Benedetta Casu *
We have investigated the radical functionalization of gold surfaces with a derivative of the perchlorotriphenylmethyl (PTM) radical using two methods: by chemisorption from the radical solution and by on-surface chemical derivation from a precursor.
Autores: Paula Mayorga-Burrezo, * Christian Sporer, J. Alejandro de Sousa, Nicola Capra, Klaus Wurst, Núria Crivillers, Jaume Veciana and Concepció Rovira *.
A push–pull-functionalized stilbene has been prepared, with an electroactive perchlorotriphenylmethyl (PTM˙) radical and dimethylamine units as electron-withdrawing and -donating moieties, respectively, showing an electrocatalytic redox-induced Z → E isomerization where the open-shell nature of PTM˙ plays a key role in the isomerization ocurrance.
Título : Nanoscale Mapping of the Conductivity and Interfacial Capacitance of an Electrolyte‐Gated Organic Field‐Effect Transistor under Operation
Autores: Adrica Kyndiah, Martí Checa, Francesca Leonardi, Ruben Millan‐Solsona, Martina Di Muzio, Shubham Tanwar, Laura Fumagalli, Marta Mas‐Torrent, Gabriel Gomila
Probing nanoscale electrical properties of organic semiconducting materials at the interface with an electrolyte solution under externally applied voltages is key in the field of organic bioelectronics. It is demonstrated that the conductivity and interfacial capacitance of the active channel of an electrolyte‐gated organic field‐effect transistor (EGOFET) under operation can be probed at the nanoscale using scanning dielectric microscopy in force detection mode in liquid environment.
The aggregation of α-synuclein is a critical event in the pathogenesis of neurological diseases, such as Parkinson or Alzheimer. Here, we present a label-free sensor based on an Electrolyte-Gated Organic Field-Effect Transistor (EGOFET) integrated with microfluidics that allows for the detection of amounts of α-synuclein in the range from 0.25 pM to 25 nM. The lower limit of detection (LOD) measures the potential of our integrated device as a tool for prognostics and diagnostics.
Autores: Tommaso Salzillo, Antonio Campos, Adara Babuji, Raul Santiago, Stefan T. Bromley, Carmen Ocal, Esther Barrena, Rémy Jouclas, Christian Ruzie, Guillaume Schweicher, Yves H. Geerts, Marta Mas‐Torrent.
The lack of long‐term stability in thin films of organic semiconductors can often be caused by the low structural stability of metastable phases that are frequently formed upon deposition on a substrate surface. Here, thin films of 2,7‐dioctyloxy[1]benzothieno[3,2‐b]benzothiophene (C8O‐BTBT‐OC8) and blends of this material with polystyrene by solution shearing are fabricated.
The occurrence of isostructural conducting radical cation salts of diversely substituted tetrathiafulvalene (TTF) precursors with the same anion is most often limited to very similar derivatives such as tetramethyl-tetrathiafulvalene (TMTTF) and tetramethyl-tetraselenafulvalene (TMTSF).
Autores: M. R. Ajayakumar, César Moreno*, Isaac Alcón, Francesc Illas, Concepció Rovira, Jaume Veciana, Stefan T. Bromley*, Aitor Mugarza, and Marta Mas-Torrent*.
Organic radical monolayers (r-MLs) bonded to metal surfaces are potential materials for the development of molecular (spin)electronics. Typically, stable radicals bearing surface anchoring groups are used to generate r-MLs.
We provide experimental and theoretical understanding on fundamental processes taking place at room temperature when a fluorinated fullerene dopant gets close to a metal surface. By employing scanning tunneling microscopy and photoelectron spectroscopies, we demonstrate that the on-surface integrity of C60F48 depends on the interaction with the particular metal it approaches.
We report the effect of solution shearing speed on the performances of diF-TES-ADT-based OFETs. X-ray diffraction reveals that th low-temperature phase is predominant at low shearing speed, while, upon increasing the speed, the high-tempertature phase prevails. The effect of polymorph composition on the electrical performances is reported with the best mobilities found in a mixture of the two polymorphs.
Autores: Vicente G Jiménez, Paula Mayorga Burrezo, Victor Blanco, Vega Lloveras, Carlos J. Gomez Garcia, Tomas Solomek, Juan Manuel Cuerva, Jaume Veciana and Araceli G. Campaña
Thiele (Th) and tetrabenzo-Chichibabin (TBC) derivatives with terminal dibenzocycloheptatriene (DBHept) units were prepared. A clear correlation between their electronic and molecular structures was stablished. Insights into their closed- or open-shell ground states were gained, where particular contribution of the heptagonal carbocycles as end-groups was proved. Remarkably, a thermally accessible triplet diradical configuration was confirmed for the DBHept-TBC compound.
The relationship between chirality and superconductivity is an intriguing question. The two enantiomeric crystalline radical cation salts κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 and κ‐[(R,R)‐DM‐BEDT‐TTF]2ClO4, showing κ‐type arrangement of the organic layers, are investigated in search for superconducting chiral molecular materials following a 1992 report indicating the occurrence of a superconducting transition in the former compound.
While the initial interpretation is presently challenged through in‐depth temperature and pressure dependent single crystal resistivity measurements combined with band structure calculations, the two chiral conductors show metal like behavior with room temperature conductivities of 10–30 S cm−1 at ambient pressure and stabilization of the metallic state down to the lowest temperatures under moderate pressures.
The present work assesses improved carrier injection in organic field-effect transistors by contact doping and provides fundamental insight into the multiple impacts that the dopant/semiconductor interface details have on the long-term and thermal stability of devices.
Icosahedral metallacarboranes are θ‐shaped anionic molecules in which two icosahedra share one vertex that is a metal center. The most remarkable of these compounds is the anionic cobalt‐based metallacarborane [Co(C2B9H11)2]‐, whose oxidation‐reduction processes occur via an outer sphere electron process.
Establishing the rather complex correlation between the structure and the charge transfer in organic–organic heterostructures is of utmost importance for organic electronics and requires spatially resolved structural, chemical, and electronic details.
Organic semiconductor materials exhibit a great potential for the realization of large-area solution-processed devices able to directly detect high-energy radiation. However, only few works investigated on the mechanism of ionizing radiation detection in this class of materials, so far.
o-C2B10H12 isomerizes to m-C2B10H12 upon heating at 400 °C. Deboronation in o-C2B10H12 is a relatively easy process, whereas it is more difficult in m-C2B10H12. These two experimental facts indicate that m-C2B10H12 is thermodynamically more stable than o-C2B10H12.
Nuria Portoles-Gil, Ana M. López-Periago, Alejandro Borras, Julio Fraile, Eduardo Solano, Oriol Vallcorba, Jose G. Planas, José A. Ayllón, Concepción Domingo. Cryst. Growth Des.2020. Publication Date: March 18, 2020
Adrica Kyndiah,Francesca Leonardi, Carolina Tarantino, TobiasCramer, Ruben Millan-Solsona, Elena Garreta, Núria Montserrat, Marta Mas-Torrent, Gabriel Gomila. Biosensors and Bioelectronics. Available online 6 November 2019, 111844.
Dr. Isabel Fuentes, Dr. María José Mostazo‐López, Dr. Zsolt Kelemen, Prof. Dr. Vicente Compañ, Dr. Andreu Andrio, Prof. Dr. Emilia Morallón, Prof. Dr. Diego Cazorla‐Amorós, Prof. Dr. Clara Viñas, Prof. Dr. Francesc Teixidor. Chemistry A European Journal, 06 August 2019.
Ilario Gelmetti, Núria F. Montcada, Ana Pérez-Rodríguez, Esther Barrena,* Carmen Ocal, Inés García-Benito, Agustín Molina-Ontoria, Nazario Martín,* Anton Vidal-Ferran* and Emilio Palomares*. Energy Environ. Sci., 2019, Advance Article.
Rogger Palacios-Rivera, Esther Barrena*, Jordi Faraudo, Pierluigi Gargiani, Miguel Angel Niño, Dimitri Arvanitis, Iwona Kowalik, Juan José de Miguel, and Carmen Ocal*. J. Phys. Chem. C, 2018, 122 (42), pp 24129–24136