Tesis doctorales: TESEO

Ayuda Salir

Ficha de Tesis

Imprimir

Ministerio de Educación, Cultura y Deporte - Gobierno de España

Título: NANOSCALE PROPERTIES OF SELF-ASSEMBLED AND LATERALLY NANOSTRUCTURED SURFACE SYSTEMS
Autor: Paradinas Aranjuelo, Marcos
Universidad: Universidad Autónoma de Barcelona
Departamento: Fisica
Fecha de Lectura: 24/11/2014
Programa de doctorado: Ciencia de Materiales
Dirección:
- Ocal, Carmen (Director)
- PASCUAL GAINZA, JORDI (Tutor/Ponente)
Tribunal:
- Morant Zacares, Carmen (presidente)
- RATERA BASTARDAS, IMMA (secretario)
- GARCÍA DE OTEYZA FELDEMANN, DIMAS (vocal)
Descriptores:
- FISICA DEL ESTADO SOLIDO
Localización: BIBLIOTECA DE COMUNICACIÓN Y HEMEROTECA GENERAL DE LA UNIVERSIDAD AUTÓNOMA DE BARCELONA

2014paradnanos.pdf

Marcador: https://www.educacion.gob.es/teseo/mostrarRef.do?ref=1127085Añadir a favoritos.
Resumen:
The present work lies within the scope of the morphological, mechanical, electrostatic and conductive characterization of self-assembled and nanostructured systems, including organic thin films and inorganic surfaces. Scanning probe microscopy (SPM) techniques, in general, and scanning force microscopy (SFM), in particular has become one of the most powerful tools in nanotechnology because they offer the combined capability of surface properties characterization and manipulation of material surfaces in the nanoscale. In this work we make use of SPM techniques, both SFM and scanning tunneling microscopy (STM), under controlled ambient conditions for the characterization and manipulation of different self-assembled and nanostructured systems. We mainly focus on the use of SFM in contact, dynamic, friction force microscopy (FFM), conductive scanning force microscopy (CSFM) and Kelvin probe force microcopy (KPFM) operating modes for such a purpose. The thesis is organized in the following way: the motivations for this work are presented in chapter 1, and a short introduction to the self-assembled concept and nanostructured systems in organic thin films and inorganic surfaces is done in chapter 2. Chapter 3 introduces the fundamental description of the experimental techniques and procedures used. The main experimental characterization SPM techniques are introduced and a particular attention is devoted to explain the different SFM techniques used. In the same chapter, the growth techniques of organic thin film are explained, including, the solution based methods, the soft lithography ¿-contact printing (¿CP) and the organic molecular beam deposition (OMBD). In chapter 4 we investigate the influence of the supramolecular structure of self-assembled monolayers (SAMs) into the morphological, mechanical, electrostatic and conductive properties of a functionalized surface. For this purpose we study the CH3(C6H4)2(CH2)4SH) (BP4) molecule SAM on the Au(111) surface presenting two different coexisting supramolecular arrangements. We show how the supramolecular order of the SAM is a decisive factor influencing the nanoscale properties of the surface and also demonstrate how FFM can be employed to differentiate SAM domains with different orientation. In addition, based on electron current measurements, the combined use of STM and CSFM allows us interpreting the differences in apparent height as measured by one or the other technique in non-homogeneous organic layers. In chapter 5 we study the properties of the nanopatterned SrTiO3 (001) surface and explore its use as template for the selective adsorption of SAMs. We find that stearic acid molecules (containing a COOH headgroup) selectively chemisorb on the TiO2 surface. This fact allows us to investigate SAMs adsorption influence on the mechanical and electrostatic properties of this oxide surface. We address the main characteristics of the nanopatterned SrTiO3 (001) surface and we describe the selective adsorption of SAMs on the TiO2 surface, discussing how this influences the local mechanical and electrostatic properties of the surface. Finally, in chapter 6 we present two different tip-induced effects which can be use to manipulate organic thin film materials. We address the mechanical induced growth of pentacene molecular layers, a phenomena that can be used as a local nanolithography approach for nanostructuration. And we also provide a way for peeling a layered organic molecular material when a voltage is applied between the conducting system and the conducting probe of the SFM, which is important to take into account for the design of organic electronic devices.

Imprimir

Modificar Consulta Nueva Consulta

versión 4.2