Abstract
Stable colloidal gold nanoparticles (Au NPs) are synthesized successfully using a seeding growth technique. The size of the nanoparticles is determined using transmission electron microscopy (TEM), and it is observed that the size of the nanoparticles ranges from 7 to 30 nm. The TEM images and optical absorption spectra of the Au NPs reveal that the suspension is well dispersed and consistent with the particle size. The feasibility of the seeding growth technique is investigated using Turbiscan Classic MA 2000 screening stability tester. Based on the peak thickness kinetics and mean value kinetics, the backscattered light profiles indicate that the suspension is highly stable without particle sedimentation as well as negligible agglomeration. In addition, the Au NPs are proven to remain stable over a period of 2 months. Particle sedimentation eventually occurs due to the weight of nanoparticles. It is concluded that the seeding growth technique is feasible in synthesizing stable Au NPs. Controlling the stability, size and shape of Au NPs are technologically important because of the strong correlation between these parameters and the optical, electrical, and catalytic properties of the nanoparticles.
Highlights
Noble metal nanoparticles (NPs) are important candidates for photonics, plasmonics, and metamaterials (MMs) applications [1]
Particle agglomeration is not observed in these images, which implies that the Au NPs are homogeneously dispersed when deionised water is used as the medium in the synthesis
A stable gold nanoparticle (Au NP) colloidal system has been prepared successfully using a seeding growth technique coupled with a step-by-step particle enlargement route
Summary
Noble metal nanoparticles (NPs) are important candidates for photonics, plasmonics, and metamaterials (MMs) applications [1]. They have attracted considerable interest among researchers over the years because of their unique properties, that is, localized surface plasmon resonance (LSPR). The LSPR enhances the optical and photothermal properties of NPs and results in strong scattering and absorption of light. These plasmonic properties enable metal NPs to be used in biodiagnostics, biophysical studies, and medical therapies when they are integrated into biological systems. The cosputtering property of gold-silica nanocomposites opens up the possibility to use these nanocomposites as biosensors in the detection of human ovarian cancer cells [5]
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