Electrochemical Fabrication and Characterization of Porous Silicon/Polypyrrole Composites and Chemical Sensing of Organic Vapors
Abstract
Electrochemical functionalization of porous silicon surface with polypyrrole via cyclic voltammetry method is presented. Surface morphology and spatial distribution of elements in the porous silicon/polypyrrole layer were inspected using Scanning Electron Microscopy and Energy-Dispersive X-ray Spectroscopy, respectively.
Changes of surface chemical composition during electrodeposition were determined by Fourier-transform infrared spectrometry. Porous silicon samples were subsequently tested for selectivity improvement of photoluminescence sensor response in chemical sensors of organic vapors.
Combined effect of polarity and size of detected analytes played a decisive role in interaction of analyte with polypyrrole layer and determined modified sensor response of porous silicon/polypyrrole composite.