Tesis doctoral de Victor Barcons Xixons
The atomic force microscope (afm) is currently employed for high spatial sample characterization in the nanoscale. Since the surfaces do not need to be electrical conductors, afm has become a valuable tool for fields such as chemistry, geology and materials science. The afm can be operated under environmental and bio-friendly conditions making it a unique tool for biology. Contributions to the characterization of the afm allow improving its performance and simultaneously advance in the understanding of physical phenomena at the nanoscale. this works presents the development of a methodology that provides quantitative information about the sensitivity that can be obtained in terms of spatial resolution in the two main modes of dynamic afm. The concept of spatial horizon is employed to describe and quantify the capacity of each dynamic mode to detect an atomic defect in a surface as opposed to previous works which where qualitative and relatively subjective. we further present numerical models related to nanoscale phenomena observed in the interaction between water films absorbed on surfaces. The results presented here accurately reproduce phenomena that has not been previously reproduced nor reported. We report for the first time the existence of an atomic net interaction force that is practically independent of the separation. The force extends a few nanometers above surfaces exposed to moisture over time in ambient conditions. finally, a study related to chemical and/or mechanical nanoscale properties and phenomena, such as the presence of absorbed water layers, is presented and discussed in terms of subharmonic excitation in dynamic afm. A theory with the potential of employing subharmonics as a tool for the detection of water on nanoscale heterogeneous surfaces is also put forward.
Datos académicos de la tesis doctoral «Contribució a la caracterització del microscopi de forÁ§a atómica«
- Título de la tesis: Contribució a la caracterització del microscopi de forÁ§a atómica
- Autor: Victor Barcons Xixons
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 31/10/2013
Dirección y tribunal
- Director de la tesis
- Jose Font Teixido
- Tribunal
- Presidente del tribunal: francesc Perez murano
- neus Domingo marimon (vocal)
- (vocal)
- (vocal)