A Facile, Water-Based Synthesis of Highly Branched Nanostructures of Silver

Wang, Yilong; Camargo, Pedro H. C.; Skrabalak, Sara E.; Gu, Hongchen; Xia, Younan

doi:10.1021/la8020904

Cited by 126 publications

(99 citation statements)

References 36 publications

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“…At around 10 min, the color of the reaction solution maintained stable opaque black, suggesting that the reaction was complete and the mature structures of the nanoparticles were obtained (Figure 7f). This type of nanocrystal growth, formation of initial multipod particles with tubers followed by autocatalytic growth, has previously been observed in the formation of hyperbranched Ag nanostructures 56 and Pt polycrystalline nanodendrites. 57 Following the above discussions, Figure 8 shows a possible schematic pathway to illustrate the formation of Pt singlecrystalline nanoflowers.…”

Section: Resultssupporting

confidence: 63%

Iodine Ions Mediated Formation of Monomorphic Single-Crystalline Platinum Nanoflowers

Yin

Wang

et al. 2012

Chem. Mater.

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Well-defined and strikingly monomorphic single-crystalline Pt nanoflowers were successfully synthesized through the addition of a large amount of iodine ions into polyol process (5 mM H 2 PtCl 6 , 30 mM KI, and 50 mM PVP in ethylene glycol solution at 160°C). The detailed structures of the Pt nanoflowers were studied with high-resolution TEM, indicating that high-quality production of the Pt nanoflowers could be obtained when the KI concentration was increased to six times of H 2 PtCl 6 . The size of Pt nanoflowers could be tuned by changing the concentration of H 2 PtCl 6 with the constant Pt/I ratio (1:6). The formation process of the nanoflowers was investigated by the UV−vis and EXAFS spectroscopic studies, demonstrating that the iodine ions played a key role in inducing the formation of the single-crystalline Pt nanoflowers. After the addition of iodine ions into the polyol synthesis, the Pt−I complex was formed and reduced by different kinetics compared with that of H 2 PtCl 6 to induce the overgrowth of Pt nanocrystals. Additionally, a small portion of iodine element was found to be strongly adsorbed on the surfaces of Pt nanoflowers, which probably also favored the anisotropic overgrowth of Pt nanocrystals resulting in the single-crystalline Pt nanoflowers. A comprehensive set of systematic studies on the synthesis factors (the concentrations of Pt precursor, iodine ions and PVP, reaction temperature, different kinds of Pt precursors and reaction atmosphere) was also reported.

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Section: Resultssupporting

confidence: 63%

Iodine Ions Mediated Formation of Monomorphic Single-Crystalline Platinum Nanoflowers

Yin

Wang

et al. 2012

Chem. Mater.

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“…As a result, the formation of highly branched nanostructures requires growth under conditions that typically favour kinetic products. To date, a range of branched nanostructures have been synthesized for various noble metals, including Pt, [27][28][29] Pd, 3,[30][31][32] Au, 33,34 Ag, 35 and Ru. 36 However, the fast rate of kinetically controlled growth makes it difficult to control the final particle size, with branched structures >100 nm being produced.…”

Section: -26mentioning

confidence: 99%

Synthesis and catalytic properties of highly branched palladium nanostructures using seeded growth

et al. 2016

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Access to the full text of the published version may require a subscription. In order to develop nanocatalysts with enhanced catalytic performance, it is important to be able to synthesize nanocrystals enclosed by high-index surface facets, due to their high denisty of low coordinated atoms at step, ledge and kink sites. Here, we report a facile seed-mediated route to the synthesis of highly branched Pd nanostructures with a combination of {113}, {115} and {220} high-index surface planes. The size of these nanostructures is readily controlled by a simple manipulation of the seed concentration. The selective use of oleylamine and oleic acid was also found to be critical to the synthesis of these structures, with Pd icosahedra enclosed by low-index {111} facets being produced when hexadecylamine was employed as capping ligand. The structure-property relationship of these nanostructures as catalysts in Suzuki-cross coupling reactions was then investigated and compared, with the high-index faceted branched Pd nanostructures found to be the most effective catalysts. Rights

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“…12a). For example, Xia's group employed AA [188], citric acid [189], and PVP [190] as reductants for the synthesis of Pd NCs in a water-based system, achieving the control of the reduction kinetics, and thus the morphology of Pd NCs (Fig. 13) [191].…”

Section: Reduction Reaction For Monometallic Ncsmentioning

confidence: 99%

Understanding of the major reactions in solution synthesis of functional nanomaterials

Wang

2016

Sci. China Mater.

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This review covers the major reactions involved in the solution synthesis of nanomaterials. It was designed to classify the traditional strategies such as precipitation, reduction, seed growth, etching, and so on into two basic processes which are termed as bottom-up and top-down routines. The discussion is focused on the basic mechanism and principles during the nucleation and growth of nanocrystals, especially in the solution system. This review also presents a prediction for how to utilize these intrinsic processes to artificially construct the desired specific and functional nanostructures. We try to describe the most directive and effective way to control the structures of nanocrystals for researchers who can master the major reaction mechanism and grasp the basic technologies in synthetic nanoscience.

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A Facile, Water-Based Synthesis of Highly Branched Nanostructures of Silver

Cited by 126 publications

References 36 publications

Iodine Ions Mediated Formation of Monomorphic Single-Crystalline Platinum Nanoflowers

Iodine Ions Mediated Formation of Monomorphic Single-Crystalline Platinum Nanoflowers

Synthesis and catalytic properties of highly branched palladium nanostructures using seeded growth

Understanding of the major reactions in solution synthesis of functional nanomaterials

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