Engineering new tools for automated fabrication of molecular thin films and study of their electrical properties
Resumen en castellano El propósito de esta tesis, titulada “Ingeniería de nuevas herramientas para la automatización. Fabricación de películas delgadas moleculares y Estudio de sus propiedades eléctricas”, es el desarrollo de algunas plataformas faltantes en el Instituto de Ciencia Molecular (ICMol) para llevar acabo el estudio de propiedades eléctricas de materiales moleculares e integrarlos en dispositivos electrónicos. Los objetivos específicos son: i) la nanoestructuración de materiales moleculares novedosos como los polipéptidos, las redes metal orgánicas bidimensionales (2D MOFs, two dimentional metal organic frameworks), polímeros de coordinación que presenten bi-estabilidad de espín…
Reinforced Room-Temperature Spin Filtering in Chiral Paramagnetic Metallopeptides
Chirality-induced spin selectivity (CISS), whereby helical molecules polarize the spin of electrical current, is an intriguing effect with potential applications in nanospintronics. In this nascent field, the study of the CISS effect using paramagnetic chiral molecules, which could introduce another degree of freedom in controlling the spin transport, remains so far unexplored. To address this challenge, herein we propose the use of self-assembled monolayers (SAMs) of helical lanthanide-binding peptides. To elucidate the effect of the paramagnetic nuclei, monolayers of the peptide coordinating paramagnetic or diamagnetic ions are prepared. By means of spin-dependent electrochemistry, the CI…
Ultrathin Films of 2D Hofmann-Type Coordination Polymers: Influence of Pillaring Linkers on Structural Flexibility and Vertical Charge Transport
Searching for novel materials and controlling their nanostructuration into electronic devices is a challenging task ahead of chemists and chemical engineers. Even more so when this new application requires an exquisite control over the morphology, crystallinity, roughness and orientation of the films produced. In this context, it is of critical importance to analyze the influence of the chemical composition of perspective materials on their properties at the nanoscale. We report the fabrication of ultrathin films (thickness < 30 nm) of a family of FeII Hofmann-like coordination polymers by using an optimized liquid phase epitaxy (LPE) set-up. The series [Fe(L)2{Pt(CN)4}] (L = pyridine, pyri…
Origin of the Chemiresistive Response of Ultrathin Films of Conductive Metal–Organic Frameworks
Conductive metal-organic frameworks are opening new perspectives for the use of these porous materials for applications traditionally limited to more classical inorganic materials, such as their integration into electronic devices. This has enabled the development of chemiresistive sensors capable of transducing the presence of specific guests into an electrical response with good selectivity and sensitivity. By combining experimental data with computational modelling, a possible origin for the underlying mechanism of this phenomenon in ultrathin films (ca. 30 nm) of Cu-CAT-1 is described. ispartof: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION vol:57 issue:46 pages:15086-15090 ispartof: location…
Bottom‐Up Fabrication of Semiconductive Metal-Organic Framework Ultrathin Films
Though generally considered insulating, recent progress on the discovery of conductive porous metal-organic frameworks (MOFs) offers new opportunities for their integration as electroactive components in electronic devices. Compared to classical semiconductors, these metal-organic hybrids combine the crystallinity of inorganic materials with easier chemical functionalization and processability. Still, future development depends on the ability to produce high-quality films with fine control over their orientation, crystallinity, homogeneity, and thickness. Here self-assembled monolayer substrate modification and bottom-up techniques are used to produce preferentially oriented, ultrathin, con…
Smart molecular/MoS2 Heterostructures Featuring Light and Thermally-Induced Strain Driven by Spin Switching
In this work we exploit the ability of spin-crossover molecules to switch between two spin states, upon the application of external stimuli, to prepare smart molecular/2D heterostructures. Through the chemical design of the hybrid interface, that involves a covalent grafting between the two components, we obtain a hybrid heterostructure formed by spin-crossover nanoparticles anchored on chemically functionalized monolayers of semiconducting MoS2. In the resulting hybrid, the strain generated by the molecular system over the MoS2 layer, as a consequence of a thermal or light-induced spin switching, results in a dramatic and reversible change of its electrical and optical properties. This nov…
Spin-crossover nanoparticles anchored on MoS2 layers for heterostructures with tunable strain driven by thermal or light-induced spin switching
In the past few years, the effect of strain on the optical and electronic properties of MoS2 layers has attracted particular attention as it can improve the performance of optoelectronic and spintronic devices. Although several approaches have been explored, strain is typically externally applied on the two-dimensional material. In this work, we describe the preparation of a reversible ‘self-strainable’ system in which the strain is generated at the molecular level by one component of a MoS2-based composite material. Spin-crossover nanoparticles were covalently grafted onto functionalized layers of semiconducting MoS2 to form a hybrid heterostructure. Their ability to switch between two spi…
CCDC 1910991: Experimental Crystal Structure Determination
Related Article: Carlos Bartual-Murgui, Víctor Rubio-Giménez, Manuel Meneses-Sánchez, Francisco Javier Valverde-Muñoz, Sergio Tatay, Carlos Martí-Gastaldo, M. Carmen Muñoz, José Antonio Real|2020|ACS Applied Materials and Interfaces|12|29461|doi:10.1021/acsami.0c05733
CCDC 1910989: Experimental Crystal Structure Determination
Related Article: Carlos Bartual-Murgui, Víctor Rubio-Giménez, Manuel Meneses-Sánchez, Francisco Javier Valverde-Muñoz, Sergio Tatay, Carlos Martí-Gastaldo, M. Carmen Muñoz, José Antonio Real|2020|ACS Applied Materials and Interfaces|12|29461|doi:10.1021/acsami.0c05733