Abstract
In the present study, gold nanoparticles were synthesized in various polymer solutions by means of employing laser ablation technique at the same ablation time. Specifically, gold nanoparticles were synthesized in polyethylene glycol and chitosan solutions, in order to compare the effects of the liquid media which served as stabilizers for particle size and volume fraction of nanoparticles. In addition, this experiment was repeated in distilled water for reference purposes. As the findings indicated, the particle size which was obtained in polyethylene glycol was about 7.49 nm, that is, smaller than those of chitosan solution and distilled water, respectively. In contrast, it was observed that the volume fraction of gold nanoparticles increased in polyethylene glycol in comparison with the other media which indicated an effect on the formation of NPs. On the other hand,Z-scan technique was employed to measure the nonlinear refractive index and nonlinear absorption coefficient of nanofluids containing gold nanoparticles. Consequently, the nonlinear properties of nanofluids pointed to a significant contribution with the number of nanoparticles observed in fluids and both optical nonlinear parameters were observed to increase by means of a prior increase in the volume fraction of Au-NPs in polyethylene glycol solution.
Highlights
A shift from the existing chemical methods into Laser ablation in liquid phase (LALP) to synthesize nanoparticles (NPs) has over the years been observed owing mainly to its environmental-friendliness, contamination-free, and nonhazardous
Such a shift, according to the Mie theory, is due to the size reduction of particles [30]. Another interesting point from UV-visible spectra is the increasing intensity of surface Plasmon resonance (SPR) observed in various media that clearly indicates that the intensity of SPR in polyethylene glycol (PEG) is relatively higher than other media
The results suggested that n2 increased more in PEG solution rather than in the chitosan solution. n2 Results obtained from (2) were negative, confirming the occurrence of self-defocusing phenomenon [33, 34]
Summary
A shift from the existing chemical methods into Laser ablation in liquid phase (LALP) to synthesize nanoparticles (NPs) has over the years been observed owing mainly to its environmental-friendliness, contamination-free, and nonhazardous. Among various NPs which are widely available, gold nanoparticles (Au-NPs) drew particular attention among scholars owing to its wide range of applications such as sensors [1], electronics [2], medical diagnoses [3], and therapeutic agent delivery [4]. In this regard, it has to be noted that the response of the NPs to the interaction of light is dependent on the size of the particles [5]. Z-scan technique was used to measure NL optical properties, respectively
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