Novel One-Phase Synthesis of Thiol-Functionalized Gold, Palladium, and Iridium Nanoparticles Using Superhydride

Yee, Chanel K.; Jordan, Rainer; Ulman, Abraham; White, Henry; King, Alexander H.; Rafailovich, Miriam; Sokolov, Jonathan

doi:10.1021/la990015e

Cited by 292 publications

(252 citation statements)

References 64 publications

(24 reference statements)

Supporting

Mentioning

247

Contrasting

Order By: Relevance

“…Au nanoparticles coated with PS-r-PVPh-SH were synthesized using the THF one-phase method. 61 Au precursor (HAuCl 4 ·3H 2 O, Sigma-Aldrich, > 99.9%, 0.8 mmol) and 0.2 mmol of PS 22 -r-PVPh 3 -SH or PS 20 -r-PVPh 7 -SH polymers were placed in a round-bottom flask with a magnetic stirrer. Dry THF (20 mL) was transferred into the flask via a cannula under agitation after three vacuum and argon purging cycles.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

Morphology Evolution of PS-b-P2VP Diblock Copolymers via Supramolecular Assembly of Hydroxylated Gold Nanoparticles

et al. 2012

View full text Add to dashboard Cite

ABSTRACT:We report on the strong segregation of core− shell Au nanoparticles, with a shell layer consisting of a random copolymer brush of styrene and vinylphenol (PS-rPVPh-SH), in poly(styrene-b-2-vinylpyridine) (PS-b-P2VP) diblock copolymer. Because of the formation of multiple hydrogen bonds between the hydroxyl groups within the shell of the nanoparticles and the pyridine group in PS-b-P2VP, the Au nanoparticles were strongly localized into P2VP domains with a very high volume fraction of nanoparticles (ϕ p ∼ 0.53). The spatial distribution of Au nanoparticles, observed by transmission electron microscopy (TEM), is compared with results of previous experiments where homopolymers were blended with block copolymers. If the diameter d of the nanoparticles is much less than the width D of the P2VP lamellar domains, these nanoparticles are more uniformly distributed across the P2VP domain than if d is comparable to D, in which case the nanoparticles are pushed toward the center of the P2VP domains. This behavior is similar to that observed when homopolymers are blended with block copolymers. Novel morphological transitions from spherical to cylindrical P2VP morphologies and from lamellae to cylindrical PS morphologies were observed during coassembly of these functional nanoparticles with block copolymers.

show abstract

Section: ■ Experimental Methodsmentioning

confidence: 99%

Morphology Evolution of PS-b-P2VP Diblock Copolymers via Supramolecular Assembly of Hydroxylated Gold Nanoparticles

et al. 2012

View full text Add to dashboard Cite

show abstract

“…PS-and PVP-coated gold particles are synthesized by standard reduction of HAuCl 4 ‚3H 2 O in THF 11 or two phase toluene/water 12 utilizing thiol-terminated PS (M n ∼ 1300 g/mol, PDI ) 1.10) and PVP (M n ∼ 1500 g/mol, PDI ) 1.09) stabilizing ligands, respectively. For particles coated with both PS and PVP chains, a 1:1 molar mixture of PS:PVP thiol is added to the synthesis batch in THF.…”

mentioning

confidence: 99%

Control of Nanoparticle Location in Block Copolymers

et al. 2005

View full text Add to dashboard Cite

“…[12][13][14][15] Even though these one-phase syntheses have been shown to significantly narrow the particle size distribution, to our best knowledge, monodisperse metallic particles with size dispersivity <5% have not yet been reported by using any one-phase synthesis without a subsequent size-selection process.…”

mentioning

confidence: 99%

One-Step One-Phase Synthesis of Monodisperse Noble-Metallic Nanoparticles and Their Colloidal Crystals

2006

View full text Add to dashboard Cite

Noble-metallic nanoparticles have attracted increasing research attention during the past decades due to their interesting sizedependent optical, electronic, and catalytic properties. 1,2 Nanoparticles with a narrow size distribution can further function as building blocks for the construction of higher-ordered superlattices that exhibit collective properties of individual nanoparticles. [3][4][5][6][7][8] Although several synthetic routes of noble-metallic nanoparticles have been developed, the challenge remains of obtaining monodisperse nanoparticles with size <10 nm on a large scale. Since the first report in 1994, the syntheses of metallic nanoparticles with size less than 10 nm have been dominated by the Brust method, a twophase protocol that can be easily scaled up to gram scale. However, the nanoparticles prepared by the Brust method and its variations typically have a continuous and broad size distribution in the range of 1-4 nm. 9,10 Similarly, the method based on the solvated metal atom dispersion technique is suitable for preparation of metal nanoparticles on the gram scale, 6,11 but post-heat treatment is generally required for good size dispersivity.Recently, efforts have been made to develop one-phase syntheses in which the reduction of metal takes place homogeneously in a selected organic solvent rather than at the two-phase interface as in the Brust method. 12-15 Even though these one-phase syntheses have been shown to significantly narrow the particle size distribution, to our best knowledge, monodisperse metallic particles with size dispersivity <5% have not yet been reported by using any one-phase synthesis without a subsequent size-selection process.We report here a facile one-step one-phase synthetic route to achieve a variety of metallic nanoparticles by using amine-borane complexes as reducing agents. With the use of different metal sources, both mono-and alloyed metallic nanoparticles with a narrow size distribution can be obtained in a single step on a gram scale. The synthesized nanoparticles are ready to function as building blocks for the formation of large colloidal crystals ( Figure 1) directly from the reaction mixtures.All syntheses were carried out in air by mixing metal source(s) and capping ligand (e.g., thiols) in an organic solvent, such as benzene, toluene, or chloroform. An amine-borane complex was then added to the mixture and stirred until the reduction was complete. As an example, dodecanethiol-capped gold nanoparticles were prepared as follows: 0.25 mmol AuPPh 3 Cl was mixed with 0.125 mL of dodecanethiol in 20 mL of benzene to form a clear solution to which 2.5 mmol of tert-butylamine-borane complex was then added. The color of the mixture darkened gradually and became purple-red after stirring at 55°C for 5 min. TEM samples were prepared by dipping carbon-coated Cu TEM grids directly into the solution and drying in air for at least 2 h. As shown in Figure 1A, long-range close-packed superlattices of 6.2 nm gold nanoparticles ( Figure 1A) can be obtained even without ...

show abstract

Novel One-Phase Synthesis of Thiol-Functionalized Gold, Palladium, and Iridium Nanoparticles Using Superhydride

Cited by 292 publications

References 64 publications

Morphology Evolution of PS-b-P2VP Diblock Copolymers via Supramolecular Assembly of Hydroxylated Gold Nanoparticles

Morphology Evolution of PS-b-P2VP Diblock Copolymers via Supramolecular Assembly of Hydroxylated Gold Nanoparticles

Control of Nanoparticle Location in Block Copolymers

One-Step One-Phase Synthesis of Monodisperse Noble-Metallic Nanoparticles and Their Colloidal Crystals

Contact Info

Product

Resources

About