Surface modification of textured silicon and its wetting behaviour

Abstract

Textured silicon (Si) substrate were prepared using various texturing methods both chemical and physical and their water contact angle, surface topography and Raman spectra were studied and investigated. The effect of plasma and chemical treatment on micro/nanostructure and roughness of the surface with and without deposition of Octadecyltrichlorosilane (ODTS, Cl 3 Si (CH 3 ) 17 ), self-assembled monolayer (SAM) is investigated for achieving higher water contact angle (θ c ). The importance of synergism of texturing with deposition of ODTS SAM in preparing superhydrophobic silicon surfaces has been discussed. It is shown that superhydrophobic silicon surfaces can be achieved on silicon surfaces by coating with ODTS, irrespective of whether it is textured or not, polished or unpolished, provided a chemical treatment is given to the surface prior to the ODTS coating.

Study of the growth kinetics of biomimetically grown hydroxyapatite coatings in large gradient magnetic fields

“…Among these methods, growth from biomimetic solutions on SAMs has become an important research technique to produce surfaces with very well defined chemical compositions [5]. Selfassembled monolayers (SAMs) applications have been expanding in many fields, such as sensing [6], surface modification [7], bioelectrochemistry [8], etc. The biomimetic preparation of HAp coatings on SAMs is based on the nucleation and growth of calcium phosphate from SBF at 37 • C; therefore, the investigation of the nucleation and growth processes of calcium phosphate in SBF is helpful to obtain HAp coatings with the desired characteristics.…”

Pattern Collapse of High-Aspect-Ratio Silicon Nanostructures - A Parametric Study

“…Formation of such capillary-force induced aggregates is particularly pronounced in the case of dense arrays of HAR -structures and is considered as a critical failure mechanism in device fabrication [5]. Surface modification of HAR-structures by deposition of organic layers has a potential to reduce pattern collapse greatly, but may result in superhydrophobic conditions [6]. Such superhydrophobic property prevents aqueous solutions to penetrate in between the structures and can thus severely reduce the effectiveness of wet processing steps.…”