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Angle resolved XPS for selective characterization of internal and external surface of porous silicon
- Source :
- Applied Surface Science. 406:144-149
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Selective functionalization of the external/internal pore surface of porous silicon is of interest for the numerous potential applications of this material, in particular in pharmacology. With the aim of obtaining porous silicon platforms compatible with the aqueous environment and providing hydrophobic pores to load poorly water soluble molecules, we set-up a three step functionalization procedure consisting in two hydrosilylation reactions separated by the selective etching of the external surface. This procedure was applied both, to porous layers and porous microparticles. The characterization of the functionalized material by conventional techniques such as contact angle and FTIR showed a change of the properties of porous structures in line with the expected surface modifications. However, these techniques do not permit to clearly distinguish between internally and externally grafted functional groups. For this reason, an innovative procedure based on angle-resolved XPS was set-up and applied to differently functionalized pSi layers. By this technique, we obtained indications of prevalent grafting of hydrophilic moieties on the external surface and hydrophobic ones inside the pores.
- Subjects :
- Materials science
Hydrosilylation
Analytical chemistry
General Physics and Astronomy
02 engineering and technology
010402 general chemistry
Porous silicon
01 natural sciences
Contact angle
chemistry.chemical_compound
X-ray photoelectron spectroscopy
Etching (microfabrication)
Fourier transform infrared spectroscopy
Porosity
technology, industry, and agriculture
Surfaces and Interfaces
General Chemistry
equipment and supplies
021001 nanoscience & nanotechnology
Condensed Matter Physics
0104 chemical sciences
Surfaces, Coatings and Films
Chemical engineering
chemistry
Surface modification
0210 nano-technology
Subjects
Details
- ISSN :
- 01694332
- Volume :
- 406
- Database :
- OpenAIRE
- Journal :
- Applied Surface Science
- Accession number :
- edsair.doi...........250bae34482e507c0543f0047d6ef4e8
- Full Text :
- https://doi.org/10.1016/j.apsusc.2017.02.099