Synthesis of uniform silver nanoparticles with a controllable size

Dadosh, Tali

doi:10.1016/j.matlet.2009.07.042

Cited by 151 publications

(96 citation statements)

References 18 publications

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“…Quantitatively, the molar absorptivity values for the plasmon absorption peak in different samples (with different Ag 0 -coating levels, Figure 1) (Figure 2). [21][22][23][24][25][26][27][28] An interpolation on the plot for the experimentally determined molar absorptivity value given herein for the Ag 0 in coated carbon nanoparticles would correspond to Ag 0 nanoparticles of 2-3 nm in diameter ( Figure 2). The overall Ag 0 -coated particles though, were larger, but still mostly less than 10 nm with a somewhat broad size distribution, as confirmed by the results from electron microscopy characterization (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

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Carbon Nanoparticles as Chromophores for Photon Harvesting and Photoconversion

Sahu

Cao

et al. 2011

ChemPhysChem

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Carbon nanomaterials have generated a tremendous amount of attention in the scientific community. While most of the research and development efforts have been on fullerenes, carbon nanotubes, and graphene sheets, carbon nanoparticles (which are often considered as impurities or unwanted complications in the other carbon nanomaterials) have recently emerged as a unique class of highly fluorescent nano-dots. However, little or no attention has been paid to potential uses of carbon nanoparticles as chromophores in photochemical reactions or for photon harvesting and photoconversion in general. In the study reported herein we demonstrate the chromophore-equivalent functions of aqueous-suspended small carbon nanoparticles in harvesting visible photons for the reductive coating of the nanoparticles with silver and gold and, as a result, the preparation of unique carbon-noble-metal core-shell nanostructures.

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Section: Resultsmentioning

confidence: 99%

“…The Ag 0 -coated carbon nanoparticles [21][22][23][24][25][26][27][28] and Au(*) [23,[29][30][31][32][33] for the interpolation of the values obtained herein for Ag (&) and Au (*).…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanoparticles as Chromophores for Photon Harvesting and Photoconversion

Sahu

Cao

et al. 2011

ChemPhysChem

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“…Tannic acid is a natural polyphenolic reducer belonging to the group of hydrolysable tannins, which contain glucose esterified by gallic acid in the central core. [36] Due to reducing and stabilising properties, tannic acid is often used for the synthesis of nanoparticles of gold, [37,38] silver [39,40] and nickel. [41] The additional advantage of tannic acid is that it is a natural antioxidant exhibiting also antiviral activity.…”

Section: Discussionmentioning

confidence: 99%

Gold nanoparticles and ions – friends or foes? As they are seen by human cells U-937 and HL-60

Barbasz

Oćwieja

2015

Journal of Experimental Nanoscience

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Gold nanoparticles (AuN) are one of the most investigated nanomaterials, finding numerous applications from medicine to industry. AuN were obtained by reduction of gold salts using tannic acid as a reducing agent. To detach the impact of AuN onto cells of two lines human monocytic cells (U-937) and human promyelocytic leukaemia cells (HL-60), the effects of postreaction residues (of effluent from sol cleaning) and gold ions were also examined. It was demonstrated that resistance of cells to the toxic action of AuN is dependent not only on incubation time and dosage, but also on stages of cell differentiation. It was found that after incubation of promonocytes U-937 with 25 ppm AuN, the cell viability decreased by 25% and of macrophages by 50%. Differentiated cells U-937 showed a significantly lower resistance than the not-differentiated cells. For HL-60 cells, regardless of differentiation, cell viability decreased by approximately 20% after treatment with 25 ppm AuN sol. It was noticed that U-937 exhibited higher vulnerability to AuN than HL-60 cells. It was proved that AuN induced over a 15-fold increase in nitric oxide and a decrease of intracellular glutathione levels indicating the inflammatory response of cells. Even though gold ions did not show a significant effect on cell viability, they caused fivefold increase of nitric oxide level. The results show a higher cytotoxicity of AuN than gold ions. An overall picture of the interaction of AuN with human cells of first defence line was obtained. The results indicate that AuN may cause changes in the response of phagocytes in inflammatory conditions.

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“…The concentrations of trisodium citrate and ascorbic acid were varied in order to observe the effect of these parameters especially on the size and morphology of the silver nanoparticles. The experimental technique, with some modification to the existing method reported by Dadosh [8], has been applied for this study. In detail, 80 ml of AgNO 3 was first heated to 60°C and was then added (with vigorous stirring) to 20 ml of a C 6 H 5 O 7 Na 3 and C 6 H 8 O 6 solution that was pre-heated to 60°C.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Silver Nanoparticles by Chemical Reduction Method: Effect of Reducing Agent and Surfactant Concentration

Ghazali

Jaafar

Aziz³

2014

Int. J. Automot. Mech. Eng.

101

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Uniform, well-dispersed, silver nanoparticles (AgNPs) were prepared by a simple chemical reduction method. The particles were synthesized via the reduction of AgNO 3 by trisodium citrate and ascorbic acid as a surfactant. The resulting AgNPs were characterized by X-ray diffraction analysis, transmission electron microscopy, and scanning electron microscopy. It was found that the size of the AgNPs ranged from 35-80 nm, with an average of 50 nm. In this study, the effects of trisodium citrate and ascorbic acid, which act as reducing agent and surfactant respectively on the morphology of the silver nanoparticles, were investigated. It was found that the increasing concentration of trisodium citrate resulted in decreasing size of silver nanoparticles, while increasing the concentration of ascorbic acid shows the opposite effect. Moreover, the quasi-spherical shape of as-synthesized silver nanoparticles is also more uniform with the increase of trisodium citrate. Meanwhile, a slight change in particle shape from quasi-spherical to polygonal was observed as the concentrations of ascorbic acid were increased.

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Synthesis of uniform silver nanoparticles with a controllable size

Cited by 151 publications

References 18 publications

Carbon Nanoparticles as Chromophores for Photon Harvesting and Photoconversion

Carbon Nanoparticles as Chromophores for Photon Harvesting and Photoconversion

Gold nanoparticles and ions – friends or foes? As they are seen by human cells U-937 and HL-60

Synthesis of Silver Nanoparticles by Chemical Reduction Method: Effect of Reducing Agent and Surfactant Concentration

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