Influence of dose on particle size of colloidal silver nanoparticles synthesized by gamma radiation

Abstract

Colloidal silver nanoparticles were synthesized by γ-irradiation-induced reduction method of an aqueous solution containing silver nitrate as a precursor in various concentrations between 7.40×10−4 and 1.84×10−3 M, polyvinyl pyrrolidone for capping colloidal nanoparticles, isopropanol as radical scavenger of hydroxyl radicals and deionised water as a solvent. The irradiations were carried out in a 60Co γ source chamber at doses up to 70 kGy. The optical absorption spectra were measured using UV-vis spectrophotometer and used to study the particle distribution and electronic structure of silver nanoparticles. As the radiation dose increases from 10 to 70 kGy, the absorption intensity increases with increasing dose. The absorption peak λmax blue shifted from 410 to 403 nm correspond to the increase of absorption conduction electron energy from 3.02 to 3.08 eV, indicating the particle size decreases with increasing dose. The particle size was determined by photon cross correlation spectroscopy and the results showed that the particle diameter decreases exponentially with the increase of dose. The transmission electron microscopy images were taken at doses of 20 and 60 kGy and the results confirmed that as the dose increases the diameter of colloidal silver nanoparticle decreases and the particle distribution increases.

Synthesis of silver/montmorillonite nanocomposites using γ-irradiation

“…However, the observation was consistent with earlier findings by other researchers who had reported that small Ag-NPs were obtained under further γ-irradiation doses at 40 kGy, with the mean diameter and standard deviation of 28.56 ± 9.58 nm for A5 ( Figure 5I and 5J). 58 The result showed a narrow size distribution of the Ag-NPs, indicating that the particles after 40 kGy were highly homogeneous (Table 1). This result also indicated that the interlayer structure of the MMT suspension, with the increased γ-irradiation doses, gradually solvated e aq − electron concentration, which were increased in the solvent.…”

“…Therefore, the SPR band absorption peak tended to undergo a blue-shift to 413 nm, with continuously increasing the dose of γ-irradiation to 40 kGy. 58 The increase of the absorbance with increased dose The experiments were repeated three times, and they were averaged to give the data in this table; b The data were obtained by multiplying the absorbance of the corresponding diluted solutions by their dilution factors when diluted solutions were used for the data; of γ-irradiation indicated that the concentration of Ag-NPs also increased. 61 Inductively coupled plasma-optical emission spectroscopy…”

An experimental study of thermal diffusivity of Au nanoparticles: effects of concentration particle size

“…As it can be seen, absorbance values increase with increasing the concentration of Au nanoparticles which indicated the total number of particles in the solution. Furthermore, the absorption peak shifted to lower energy or higher wavelengths with growth of nanoparticle sizes [30]. The particle size can be controlled by controlling the doses of c-radiation, however, in the present work, the specimens were prepared at different concentration levels and radiated at 50 kGy.…”

Study on the Effect of γ-Irradiation on Gadolinium Oxysulfide Nanophosphors (Gd2O2S-NPs)

“…Aqueous solutions containing isopropanol exposed to -irradiation lead to the formation of hydrated electrons (e aq − ) and primary species [16]. These free radicals may present a destructive effect to the CTAB structures resulting in separating of the cluster capped particles of Gd 2 O 2 S-NPs (Figure 2(a)) to single capped particles (Figure 2(e)).…”

“…We chose to utilize -irradiation method in order to prepare Gd 2 O 2 S-NPs due to its simplicity, low cost, and chemical safety. Moreover, this method had 2 Journal of Nanomaterials the ability to form Gd 2 O 2 S in nanometer scale with high purity and high stable state [16]. The formation of Gd 2 O 2 SNPs would be attributed to the radiolysis process in aqueous solution that creates ionic radicals and reduces metal ions.…”