Synthesis of gold nanoparticles and study their effect on optical properties of acridine orange dye

الملخص

In this work, a fluorinated Acridine Orange dye dissolved in distillate water at four

different molar concentrations (0.5 ×10-6

, 1 × 10-6

,0.5 × 10-5

, and 1 × 10-5

). Gold

nanoparticles were prepared using the chemical reduction method using gold

chloride at a concentration of (0.01 M) with sodium citrate. The reaction resulted in

a red liquid containing gold nanoparticles. Using a particle size analyzer device, an

analysis was carried out for the red liquid containing gold nanoparticles and the

proportion of 45% of the liquid contained particles of (9-11 nm) size. The gold

nanoparticles were added to the prepared dye samples with different volume

concentrations (5,10, and 15) % for each prepared sample. The linear optical

properties of the prepared samples before and after the addition were studied using a

spectrophotometer within the range (200-800 nm). The optical parameters of all

prepared samples were calculated (absorbance, transmittance, reflectivity,

absorption coefficient, linear refractive index, extinction coefficient, optical

conductivity), and the results showed the presence of a wide peak of absorption and

an increase in the value of the optical parameters after adding gold nanoparticles

and their increase with increasing the concentration of nanoparticles as well as

movement of absorption peak towards longer wavelengths (red shift).