Wet chemical synthesis of silver nanorods and nanowires of controllable aspect ratio

Jana, Nikhil R.; Gearheart, Latha A.; Murphy, Catherine J.

doi:10.1039/b100521i

Cited by 1,167 publications

(866 citation statements)

References 20 publications

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“…25 In the present approach, bromide ions were used as the shape directing agent. [26][27][28][29][30] The bromide-mediated strategy is more favorable catalytically because the bromide species are only on the nanocrystal surface and are easily removed after synthesis by washing. In general, the metal salts ( Pt(IV) and Pt(II) ), the surfactants (PVP), and the shape directing agent (bromide ions) were dissolved in ethylene glycol at room temperature to form a precursor solution.…”

Section: Resultsmentioning

confidence: 99%

Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

et al. 2009

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Platinum nanocubes and nanopolyhedra with tunable size from 5 nm to 9 nm were synthesized by controlling the reducing rate of metal precursor ions in a one-pot polyol synthesis. A two-stage process is proposed for the simultaneous control of size and shape.In the first stage, the oxidation state of the metal ion precursors determined the nucleation rate and consequently the number of nuclei. The reaction temperature controlled the shape in the second stage by regulation of the growth kinetics. These well-defined nanocrystals were loaded into MCF-17 mesoporous silica for examination of catalytic properties. Pt loadings and dispersions of the supported catalysts were determined by elemental analysis (ICP-MS) and H 2 chemisorption isotherms, respectively. Ethylene hydrogenation rates over the Pt nanocrystals were independent of both size and shape and comparable to Pt single crystals. For pyrrole hydrogenation, the nanocubes enhanced ring opening ability and thus showed a higher selectivity to n-butylamine compared to nanopolyhedra.

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Section: Resultsmentioning

confidence: 99%

Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

et al. 2009

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“…However, surfactants and amphiphilic polymers would introduce complexities for understanding the mechanism on particle-size and -shape determination due to the incorporation of various factors such as adsorption of hydrophobic tail, hydrophilic head group and counter ions (in the case of ionic surfactants) on the surface of nuclei and/or small particles, and complexation of metal ions with surfactants and/or amphiphilic polymers. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] Then we considered the surfactant-and reducer-free metal nanoparticle synthesis from metal ions in aqueous solutions (in the absence of any stabilizing, capping and reducing agents) to evaluate the mechanism on size-, shape-and stability-control of metal nanoparticles formed in solutions. Simplified system (surfactant-and reducer-free conditions) should manifest the essential mechanism on size-, shape-and stability-control of metal nanoparticles synthesized in aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Surfactant- and reducer-free synthesis of gold nanoparticles in aqueous solutions

Sakai

Enomoto

Torigoe

et al. 2009

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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We report here the surfactant-and reducer-free synthesis of gold nanoparticles from an aqueous hydrogen tetrachloroaurate (III) tetrahydrate (HAuCl 4 ·4H 2 O) solution using a high-frequency (950 kHz) ultrasound (in the absence of any stabilizing, capping and reducing agents). In particular, size, shape and stability of gold nanoparticles prepared by the 950 kHz ultrasound irradiation (sonication) for 8 min in the surfactant-free aqueous solutions were examined in terms of AuCl 4 -concentration (in the range of 0.01-0.1 mM), additional salts (NaCl, HCl and NaOH) and temperature (in the range of 4-60 ˚C). We found that higher AuCl 4 -concentration promoted particle growth (size increase) and plate formation.In addition, the plate formation was enhanced with the addition of NaCl or HCl (but not NaOH). This is most likely due to the AuCl 4 -reduction on a certain crystal facets (e.g., (110) facets) caused by the adsorption of Cl -ions on specific crystal facets (e.g., (111) facets).Furthermore, we revealed that the temperature elevated above 50 ˚C led to the formation of spherical gold nanoparticles with the diameter of 20-60 nm from a 0.1 mM AuCl 4 -aqueous solution while triangular plates formed coexisting with spherical nanoparticles below 50 ˚C.

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“…AGNp's of 7 nm and 50 nm sizes were prepared according to previously published work using AgNO 3 , sodium citrate and with NaBH 4 as the reducing agent (17)(18)(19). Particle size and morphology were determined by TEM (CM30, Philips, Philips Analytical, Holland) at an accelerating voltage of 300 kV.…”

Section: Agnp Preparationmentioning

confidence: 99%

Silver nanoparticles exhibit size-dependent differential toxicity and induce expression of syncytin-1 in FA-AML1 and MOLT-4 leukaemia cell lines

Alqahtani

Promtong

Oliver

et al. 2016

MUTAGE

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Human endogenous retrovirus (HERV) sequences make up approximately 8% of the human genome and increased expression of some HERV proteins has been observed in various pathologies including leukaemia and multiple sclerosis (MS). However, little is known about the function of these HERV proteins or environmental factors which regulate their expression. Silver nanoparticles (AgNPs) are used very extensively as antimicrobials and antivirals in numerous consumer products although their effect on the expression of HERV gene products is unknown. Cell proliferation and cell toxicity assays were carried out on human acute T lymphoblastic leukaemia (MOLT-4) and Fanconi anaemia associated acute myeloid leukaemia (FA-AML1) cells treated with two different sizes of AgNPs (7 nm and 50 nm diameter). RT-PCR and Western blotting were then used to the assess expression of HERV-W syncytin-1 mRNA and protein in these cells. FA-AML1 cells were more sensitive overall than MOLT-4 to treatment with the smaller 7 nm sized AgNp's being the most toxic in these cells. MOLT-4 cell were more resistant and showed no evidence of differential toxicity to the different sized particles. Syncytin-1 mRNA and protein were induced by both 7 and 50 nm AgNPs in both cell types yet with different kinetics. In summary, the observation that AgNPs induce expression of syncytin-1 in FA-AML1 and MOLT-4 cells at doses as little as 5 µg/ml is grounds for concern since this protein is up-regulated in both malignant and neurodegenerative diseases. Considering the widespread use of AgNPs in the environment it is clear that their ability to induce syncytin-1 should be investigated further in other cell types.3

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Wet chemical synthesis of silver nanorods and nanowires of controllable aspect ratio

Cited by 1,167 publications

References 20 publications

Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

Surfactant- and reducer-free synthesis of gold nanoparticles in aqueous solutions

Silver nanoparticles exhibit size-dependent differential toxicity and induce expression of syncytin-1 in FA-AML1 and MOLT-4 leukaemia cell lines

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