Grafting of functionalized polymer on porous silicon surface using Grignard reagent

• Published in: Applied surface science 2017-11, Vol.421, p.82-88
• Main Authors: Tighilt, F-Z., Belhousse, S., Sam, S., Hamdani, K., Lasmi, K., Chazalviel, J.N., Gabouze, N.
• Format: Article
• Language: English
• Subjects: Functionalization; Grignard reagent; Polymer; Porous silicon
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.01.184

[Display omitted] •Formation of nanoporous silicon by electrochemical anodization.•Grafting of aliphatic polymer on porous silicon surface by anodic treatment in ethynylmagnesium solution.•Functionalization of the polymer with pyridine and carboxyl groups.•The efficiency of the grafted polymer functionalization was confirmed by FT-IR, SEM and XPS. Recently, considerable attention has been paid to the manipulation and the control of the physicochemical properties of porous silicon surfaces because of their crucial importance to the modern microelectronics industry. Hybrid structures consisting of deposited polymer on porous silicon surfaces are important to applications in microelectronics, photovoltaics and sensors (Ensafi et al., 2016; Kashyout et al., 2015; Osorio et al.; 2015; Hejjo et al., 2002) [1–4]. In many cases, the polymer can provide excellent mechanical and chemical protection of the substrate, changes the electrochemical interface characteristics of the substrate, and provides new ways to the functionalization of porous silicon surfaces for molecular recognition and sensing. In this work, porous silicon surface was modified by anodic treatment in ethynylmagnesium bromide electrolyte leading to the formation of a polymeric layer bearing some bromine substituents. Subsequently, the formed polymer is functionalized with amine molecules containing functional groups (carboxylic acid or pyridine) by a substitution reaction between bromine sites and amine groups (Hofmann reaction). The chemical composition of the modified porous silicon surfaces was investigated and the grafting of polymeric chains and functional groups on the porous silicon surface was confirmed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) which displayed the principal characteristic peaks attributed to the different functional groups. Furthermore, the surface of the material was examined by scanning electron microscopy (SEM).