WEB Synthesis of multi scale porous siliconFriday (25.09.2020) 10:55 - 11:10 S: Structural Materials 1 Part of:
Solid state bodies with characteristic pore diameters from the nano- to the macroscale are actively used as model systems to study the effect of geometrical confinement and the impact of interfaces on the structural and thermodynamical properties of condensed matter.
In this context, porous silicon (pSi) has experienced great interest for some time now. The reason can be found in the technological relevance of silicon as the semiconductor of choice for a lot of applications as well as the abundance of possible synthesis methods and pore morphologies. It is possible to fabricate porous silicon with pore diameters d from the micro- (d < 2 nm), over the meso- (2 nm < d < 50 nm) to the macroporus range (d > 50 nm) in a monolithic form. Furthermore, the embedment of soft molecular condensates opens up new functionalities of the material. Until now, the interaction of the silicon matrix with a soft filling has been investigated for a filling with simple macromolecules without any functionality and for simple pore geometries only – in particular, no multiscale pSi.
The material is fabricated by the deposition of silver nanoparticles in an electrolyte of hydrofluoric acid by a process called metal assisted chemical etching. The resulting material is characterized by different techniques, from transmission electron microscopy to electrochemical methods.