Síntesi i caracterització electrònica de materials basats en trifenilé

• Autores: Noemí Contreras Pereda
• Directores de la Tesis: Daniel Ruiz Molina (dir. tes.)
• Lectura: En la Universitat Autònoma de Barcelona ( España ) en 2021
• Idioma: catalán
• Tribunal Calificador de la Tesis: Xinliang Feng (presid.), Guillermo Mínguez Espallargas (secret.), João F. Mano (voc.)
• Programa de doctorado: Programa de Doctorado en Ciencia de Materiales por la Universidad Autónoma de Barcelona
• Materias:
  • Ciencia política
    • Opinión publica
      • Información
• Enlaces
  • Tesis en acceso abierto en: TDX
• Resumen

  • Triphenylene (TP) based materials have been living a great expansion in the latest years. TP molecules have interesting optoelectronic properties arising from the aromatic core which have been exploited in functional two-dimensional (2D) Metal-Organic Frameworks (MOFs) and Covalent Organic Frameworks (COFs) aside other organic polymers.Morphology, crystallinity and orientation, among others (which are defined by the synthetic methodology) have proven to have great impact on the properties and performance of these materials in functional devices. Thus, development of synthetic approaches that allow for control and fine-tuning of these characteristics is crucial to fully enhance the applications of these materials. With this aim, in this Thesis different morphologies have been explored: supported MOF monolayer and multilayer crystals and supported and free-standing thin films. The approaches used are totally new and on the frontier of current knowledge, in search of new formats that allow the properties of these materials to be exploited. Additionally, impact of physico-chemical properties as crystal domain and orientation or wettability on the electronic characterization have been established. Furthermore, deep studies on the obtained materials has paved the way to their potential application in some cases showcasing the interdisciplinary character of this thesis.

    In a first Chapter, the deposition of cobalt-based TP 2D MOFs monolayers and bulk crystals in ultra-high vacuum (UHV) conditions is aimed. For this, work in this chapter includes optimization on the synthetic procedure of starting TP molecule (aiming for high purity for monolayer and bulk synthesis), on the bulk synthesis of the related MOF and its surface deposition using UHV techniques, specifically with the novel atomic layer injection (ALI). In a second Chapter, synthesis of centimeter large, supported MOF thin films on different substrates (insulating, conducting, flexible and hybrid) is introduced using microfluidics as microgravity simulated environment. The slow diffusion of reagents in the gas phase allowed to control the growth of the thin film and its crystalline orientation, having a great impact on the film electrical conductivity and charge carrier transfer. Finally, in the last Chapter, TP-based melanin-inspired free standing thin films were developed. The synergy between the adhesive and conductive properties under humid and sweat-like conditions indicated the good performance of the free-standing film as active material for wearable electronic artificial skin devices.