Studying the surface morphology and optical properties of 4-methylbenzenthiol capped gold nanoparticles films with annealing

Abstract EN

Surface morphology and optical properties in term of Surface Plasmon Resonance (SPR) of 4-methylbenzenthiol capped gold nanoparticles using Langmuir-Schaefer (LS) technique were studied.

1 and 3-layers nanoparticle films with 1mg/ml in concentration have been prepared.

Gold nanoparticles films were annealed at 200oC for 1h.

Film’s morphology and SPR before and after annealing were investigated by Atomic Force Microscopy (AFM) and UV-Vis spectrophotometer respectively.

After annealing, a drastic change in the shape and size of the nanoparticles was revealed; however, no significant effect of film thickness on the gold nanoparticle size was observed.

UV-Vis spectra showed reduction in intensity and decrease in width of SPR peaks as a result to annealing.

Blueshift in SPR position has been observed for both heat treated films