Synthesis of gold nanoparticles chemically doped with porous silicon for organic vapor sensor by using photoluminescence

Gold nanoparticles (AuNPs) were formed by applying the seed-growth where use reducing and capping agent we found the size of nanoparticle depended on the amount of the seed that added to growth solution. AuNPs are incorporated into porous silicon (PS) that was prepared using the electrochemical etching technique. In this study, the influence of gold colloids on PS characteristics has been investigated. Different colloidal solution of gold colloid has been characterized by UV-vis, then using the solution to dope PS by electrochemical etching. The influences of gold colloid with PS characteristics have been investigated. The morphology after noble metal modification was exhibited by atomic force microscopy (AFM) and the study of structural properties by using X-ray diffraction (XRD) was also carried out, while, Fourier Transform Infrared (FTIR) characterization techniques proved the oxidation of PS substrate. We also found that the PL intensity is depended on concentration of AuNPs and affected by organic vapor chemical. It has been found that the PL spectrums of PS doped with AuNPs improved the PL intensity.