"Nanostructured (porous) silicon: growth strategies, surface modification and biomedical applications"
Who: Miguel Manso, UAM, Spain
Place: nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
Date: Monday, 10 December 2018, 11:00
The current developments in processing of silicon nanostructures promise a long lasting presence of silicon among forefront technological materials after its supremacy during the micro-electronics era. We will demonstrate that the "classical" processing of nanostructured (porous) silicon (PSi) by electrochemical etching is still valid to face new fundamental and technological challenges. Using different organosilane functionalizations of columnar PSi and wet scanning transmission electron microscopy, we show that local water adsorption isotherms can be obtained, reflecting the surface termination properties (hydrophilic/hydrophobic) of the produced PSi surfaces. We further illustrate how visible light can be used to activate the assembly of organosilanes on PSi. Based on this activation, we propose a full biofunctionalization cascade to fabricate an impedimetric biosensing structure, which is enhanced by gold nanoparticles through a sandwich assay. Laser processing offers increasingly attractive ways of processing Si nanostructures, including PSi. We will show our first results of characterization and properties of PSi produced by direct laser writing (LWSi). Results will concentrate on the use of LWSi structures to guide and confine pluripotential mesenchymal stem cells and for the non-noble-metal surface enhanced Raman scattering detection of a model drug (apomorphine).
Host: A. Bittner