Matter of age: growing anisotropic gold nanocrystals in organic media

Gaikwad, Anil V.; Verschuren, Peter; Kinge, Sachin; Rothenberg, Gadi; Eiser, Erika

doi:10.1039/b715112h

Cited by 38 publications

(25 citation statements)

References 64 publications

(67 reference statements)

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“…Evidence in favor of this argument is the complete disappearance of the Au 3þ CTTS (charge-transfer-to-solvent) absorption band at 325 nm in DMF, at 25 8C within 20 h for AuCl 3 , [21] while more than 5 days are required to reduce the same amount of AuCl À 4 under the same conditions (unpublished results).…”

Section: Redox Chemistry Of Dmfmentioning

confidence: 97%

“…Recently Gaikwad et al argued, [21] on the basis of cyclic voltammetry studies, that DMF can reduce Au 3þ ions to either Au þ or Au 0 in the absence of any other reducing agent. Considering that the gold salt used was AuCl 3 , they proposed the following parallel reactions:…”

Section: Redox Chemistry Of Dmfmentioning

confidence: 99%

“…This was assigned to the presence of additional functional groups capable of chemisorption processes. On the other hand, Gaikwad et al [21] investigated the influence of the oxidation state of gold ions on the growth process of gold nanoparticles in DMF (see also Section 2), using teta-n-octylammonium formate (TOAF) as the main reducing agent and DMF as the solvent. Although in principle TOAF concentration only seemed to control the resulting nanoparticle shape (spherical, cubic, triangular) they realized the importance of DMF in determining the morphology of the particles.…”

Section: Capping Agents Other Than Pvpmentioning

confidence: 99%

See 2 more Smart Citations

N,N‐Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis

Pastoriza‐Santos

Liz‐Marzán

2009

Adv Funct Materials

373

254

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The versatility of wet chemical methods has rendered them extremely popular for the preparation of metal nanoparticles with tailored size and shape. This Feature Article reviews the use of N,N‐dimethylformamide (DMF) for the reduction of metal salts, mainly Au and Ag, while also acting as a solvent. Apart from describing the ability of DMF to reduce metal salts, the effect of different parameters, such as the concentration of capping agent and metal precursors, the presence of preformed seeds acting as catalysts or their crystalline structure, on particle morphology are analyzed. Published reports on the use of different capping agents are summarized, with particular emphasis on the role of poly(vinylpyrrolidone) to determine the morphology of the particles. Finally, a brief overview is provided on the modulation of the optical response in DMF‐based metal nanoparticle colloids with tunable size and shape.

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Section: Redox Chemistry Of Dmfmentioning

confidence: 97%

Section: Redox Chemistry Of Dmfmentioning

confidence: 99%

Section: Capping Agents Other Than Pvpmentioning

confidence: 99%

See 1 more Smart Citation

N,N‐Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis

Pastoriza‐Santos

Liz‐Marzán

2009

Adv Funct Materials

373

254

View full text Add to dashboard Cite

show abstract

“…Much work has been performed to achieve different morphologies of metal nanoparticles, including gold, [127,128] palladium, [128][129][130][131] rhodium, [128,[132][133][134] and silver. [128,129,[135][136][137] An extensive investigation of pre-2008 literature has been reported elsewhere.…”

Section: Shape Controlmentioning

confidence: 99%

Shape‐directed platinum nanoparticle synthesis: nanoscale design of novel catalysts

Leong

Schulze

Strand

et al. 2013

Applied Organom Chemis

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Platinum‐based catalytic materials have received significant attention, particularly in the shape and size control of faceted materials for catalysis. More recently, there has been a rapid increase in the number of reports of successful preparations in this field; however, a fundamental understanding of controlled growth towards catalytic material design is essential for future implementation and broad application. In this review, we provide an overview of the recent findings reported since 2009, focusing on methods for shape control as well as the effects of exposed surface facets on select catalytic reactions. Copyright © 2013 John Wiley & Sons, Ltd.

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“…It has been suggested that catalysis by either polyvinylpyrrolidone (PVP) or by the seeds of the metal, itself, is required for the reduction of gold ions, although the formation of Au nanoparticles both in the absence and in the presence of the metal seeds has been reported [27,28] . Therefore, it has been proposed that the use of AuCl 3 in place of HAuCl 4 may be preferable for the synthesis of Au nanoparticles via the DMF-based reduction method [26,29] . This is because AuCl 3 can be more readily reduced than HAuCl 4 , owing to the difference in the reduction potentials of Au …”

Section: N N -Dimethylformamide (Dmf)-mediated Synthesismentioning

confidence: 99%

Surfactant-free solution-based synthesis of metallic nanoparticles toward efficient use of the nanoparticles’ surfaces and their application in catalysis and chemo-/biosensing

Kawasaki

2013

Nanotechnology Reviews

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Abstract:The choice of stabilizer and the stabilizer-toprecursor ions molar ratio during metal nanoparticle synthesis are important for controlling the shape, size, and dispersion stability of the nanoparticles. However, the active sites on the nanoparticles surfaces may be blocked by the stabilizing agents used, resulting in a less-than-effective utilization of the surfaces. In this review, various surfactant-free solution-based methods of synthesizing metal nanoparticles are described, along with the applications of such nanoparticles in catalysis and sensing. " Surfactant-free " synthesis does not imply truly bare metal nanoparticles synthesis but implies one where the metal nanoparticles are prepared in the absence of additional stabilizing agents such as thiolate and phosphine compounds, surfactants, and polymers. These metal nanoparticles are stabilized by the solvents or the simple ions of the reducing agents or low-molecular-weight salts used. Surfactant-free synthesis of metal nanoparticles via photochemical-, ultrasonochemical-, and laser ablation-mediated synthesis methods is also described. Because of the effective utilization of their surfaces, metal nanoparticles prepared without surfactants, polymers, templates, or seeds are expected to exhibit high performance when used in catalysis (synthetic catalysis and electrocatalysis) and sensing (surface-enhanced Raman scattering (SERS)), surfaceassisted laser desorption/ionization-mass spectrometry (SALDI-MS)).

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Matter of age: growing anisotropic gold nanocrystals in organic media

Cited by 38 publications

References 64 publications

N,N‐Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis

N,N‐Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis

Shape‐directed platinum nanoparticle synthesis: nanoscale design of novel catalysts

Surfactant-free solution-based synthesis of metallic nanoparticles toward efficient use of the nanoparticles’ surfaces and their application in catalysis and chemo-/biosensing

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