The grafting of organic molecules onto semiconducting substrates modifies their surface properties and can be used to prepare materials with potential applications such as capacitors, sensors, anti-corrosive coatings, batteries and actuators.
The macromolecules with conjugated double bonds are distinguished from other types of polymers by their electronic conductivity. These properties are the basis for a growing interest over the last decades. One of the investigated material is the polystyrene (PS), because of its good environmental stability.
In this work, the polystyrene (PS) grafted onto the porous silicon by three different methods: dip coating, spin coating and spreading method has been studied. For this purpose, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) have been carried out to evaluate the surface modification.
The FTIR spectra show the existence of specific interactions especially a stronger hydrogen bending which is suspected to occur between the hydroxyl groups present at the surface of the porous silicon substrate and ë electrons of the polystyrene aromatic cycle. Moreover, The EDS spectrum shows the presence of a peak attributed to the carbon which is the principal constituent of the PS polymer.
In addition, SEM observations show that the morphology of the PS macromolecular chains strongly depends on the deposition- coating method.
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