Películas nanoestructuradas de polímeroshiperramificados como plantillas para laformación de estructuras metálicas

Abstract

Películas nanoestructuradas de polímeros hiperramificados como plantillas para la formación de estructuras metálicas RESUMENLa molécula Boltorn H30 es un polímero hiperramificado polihidroxilado de tercera generación de origen comercial con forma aproximadamente globular de diámetro promedio de 3,3 nm y tiene una cavidad endoreceptora que puede ser aprovechada para la incorporación de iones u otras moléculas pequeñas. En este caso, se analiza la adsorción espontánea de Boltorn H30 sobre sustratos de carbono para generar superficies nanoestructuradas capaces de captar o retener cationes cobre (II) en su interior. Posteriormente, las películas formadas se llevan a una celda electroquímica con el fin de reducir electroquímicamente el catión y generar estructuras metálicas usando el polímero hiperramificado como plantilla o molde. Estas plataformas desarrolladas con cobre electrodepositado han mostrado ser útiles para la electrocatálisis de peróxido de hidrógeno. Las superficies estudiadas en este trabajo han sido caracterizadas mediante diferentes técnicas espectroscópicas, microscópicas y electroquímicas.Palabras clave: polímero hiperramificado, superficies funcionalizadas, carbono, cobre ABSTRACTBoltorn H30 molecule is the third generation of a commercial polyhydroxylated hyperbranched polymer with an almost globular shape of 3,3 nm average diameter, which has an endo-receptor cavity that can be used for ions or some other small molecules inclusion.In this work, we analyze the spontaneous adsorption of Boltorn H30 on carbon substrates with the aim of generating nanostructured surfaces with the ability to capture or retain copper cations (II) inside. Afterwards, the formed films were taken to an electrochemical cell to reduce the cation and generate metallic structures using the hyperbranched polymer as a template. The platforms developed with electrodeposited copper are useful for the electrocatalysis of hydrogen peroxide. Along this work, the studied surfaces were characterized by means of different spectroscopical, microscopical and electrochemical techniques.

KPFM and DFT as tools to correlate the charge distribution and molecular orientation of dendritic adsorbates on different surfaces

“…Thin films made of organic molecules are extensively used in the fabrication of micro and macroscopic devices such as chemical sensors [1,2], solar cells [3,4], organic field effect transistors [5,6], and organic light emission diodes [7,8]. For instance, in the case of microelectronic devices its applicability relies on the decrease of the work function (WF) of the metal and/or semiconductor contact interfaces, in such a way to facilitate the extraction of electrons from the electrical contacts.…”

Uncovering the relationship between the structure and acid-base properties for hyperbranched polyester-polyols self-assembled on carbon surfaces

“…Strong competitors against dendritic polymers are those named highly branched polymers or hyperbranched polymers [13]. These molecules, similarly to dendrimers exhibit exceptional properties, such as multiple terminal functional groups, specific rheological properties based on their globular structure, and well-defined internal cavities available to encapsulate guest molecules [14]. Nevertheless, the least laborious synthesis of the hyperbranched polymers [15] has motivated the design of these dendritic-like structures with numerous promising applications [16][17][18][19][20].…”