Nanopeapods by Galvanic Displacement Reaction

Hangarter, Carlos M.; Lee, Young-In; Hernández, Sandra C.; Choa, Yong‐Ho; Myung, Nosang V.

doi:10.1002/ange.201001559

Cited by 14 publications

(12 citation statements)

References 36 publications

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“…Instead of using an organic surfactant to control the particle growth, a surfactant-free synthesis route using a hard template to confine the particle size would be a desirable alternative and a low-cost TE synthesis. Galvanic replacement synthesis is one such facile and scalable synthesis route for preparing nanosized materials using preformed particles as both the template and reducing agent. − Recently, Myung and co-workers and Moon et al demonstrated this strategy for making metal chalcogenide nanowires and nanotubes. − However, so far as we know, the preparation of bismuth telluride NPs in large quantities using galvanic replacement has not yet been reported.…”

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confidence: 99%

Surfactant-Free Synthesis of Bi₂Te₃−Te Micro−Nano Heterostructure with Enhanced Thermoelectric Figure of Merit

et al. 2011

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The calculation of lattice contribution in thermal conductivity:According to Wiedemann-Franz law (Equation S1), the thermal conductivity can be split into two parts: the lattice part (к L ) and electron part (к e ). к e is the product of the Lorentz number (L) with electrical conductivity and temperature. For heavily degenerated semiconductors (including our materials), 2.0 × 10 -8 V 2 K -2 is accepted as the appropriate value of the Lorentz number L. К = К L +К e = К L + LσT (S1) Due to the anisotropic properties of bismuth telluride, in this work we tested the in-plane charge transport properties and cross-plane thermal transport properties. Z. Ren and co-workers have done a very detailed study on the anisotropic TE properties of Bi 2 Te 2.7 Se 0.3 . 1 In-plane conductivity (perpendicular to press direction) is reported to be higher for both electrical and thermal test than cross-plane (parallel to press direction) by about 10%-20%. Therefore, in this work, we applied a modified factor ~0.8 to estimate the cross-plane electrical conductivity from the experimental in-plane electrical conductivity, resulting in the modification of Equation S1 to Equation S2.Here, К , К L and К e are thermal conductivities of the total, lattice part and electron part in the cross-plane orientation respectively; and σ is the electrical conductivity in the in-plane

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confidence: 99%

Surfactant-Free Synthesis of Bi₂Te₃−Te Micro−Nano Heterostructure with Enhanced Thermoelectric Figure of Merit

et al. 2011

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“…[1][2][3][4][5][6] Additionally, researchers have increasingly begun to focus their efforts on the production of nanostructures with greater structural and compositional complexity. [6][7][8] These novel structures are interesting for applications in areas such as plasmonics and catalysis due to the strong effect of geometry on the localized surface plasmon resonance (LSPR) of metal nanostructures, [9][10][11] the high surface areas possible with nonstandard geometries (such as hollow, porous, or dendritic structures), [12,13] and the synergetic effects that can occur in bimetallic catalysts. [14][15][16] Galvanic replacement is a simple and versatile route to nanostructured materials with the aforementioned attri-butes.…”

Section: Introductionmentioning

confidence: 99%

“…2 A wide variety of fundamental geometries have been demonstrated, including cubes, spheres, tetrahedrons, octahedrons, decahedrons, icosahedrons, and bipyramids 1–6. Additionally, researchers have increasingly begun to focus their efforts on the production of nanostructures with greater structural and compositional complexity 6–8. These novel structures are interesting for applications in areas such as plasmonics and catalysis due to the strong effect of geometry on the localized surface plasmon resonance (LSPR) of metal nanostructures,9–11 the high surface areas possible with nonstandard geometries (such as hollow, porous, or dendritic structures),12, 13 and the synergetic effects that can occur in bimetallic catalysts 14–16…”

Section: Introductionmentioning

confidence: 99%

The Role of Surface Nonuniformity in Controlling the Initiation of a Galvanic Replacement Reaction

Cobley¹,

Zhang²,

Song³

et al. 2011

Chemistry An Asian Journal

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The use of silver nanocrystals--asymmetrically truncated octahedrons and nanobars--characterized by a nonuniform surface as substrates for a galvanic replacement reaction was investigated. As the surfaces of these nanocrystals contain facets with a variety of different areas, shapes, and atomic arrangements, we were able to examine the roles of these parameters in different stages of the galvanic replacement reaction with HAuCl(4) (e.g., pitting, hollowing, pit closing, and pore formation), and thus obtain a deeper understanding of the reaction mechanism than is possible with silver nanocubes. We found that the most important of these parameters was the atomic arrangement, that is, whether the surface was capped by a {100} or {111} facet, and that the area and shape of the facet had essentially no effect on the initiation of the reaction. Interestingly, through the reaction with asymmetrically truncated octahedrons, we were also able to demonstrate that even when pitting occurred over a large area, this region would be sealed through a combination of atomic diffusion and deposition during the intermediate stages of the reaction. Consequently, even if pitting occurred across a large percentage of the nanocrystal surface, it was still possible to maintain the morphology of the template throughout the reaction.

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“…The geometry‐dependent physical properties of the NPPs make them attractive for various applications,10 and this arrangement can support both mechanical and chemical stability while allowing for interactions between adjacent nanoparticle components. Many such NPP structures have been achieved, including Au@SiO 2 ,10 Pt@CoAl 2 O 4 ,11 Au@Ga 2 O 3 ,12 Au@MgO,13 Cu@Al 2 O 3 ,14 Cu@TiO 2 ,14 Ag@TiO 2 ,15 Ni@TiO 2 ,16 Au@Te,17 Ag@SiO 2 ,18 and Ni@Ni 3 S 2 19…”

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Polypyrrole Shell@3D‐Ni Metal Core Structured Electrodes for High‐Performance Supercapacitors

Chen

Kuang

et al. 2015

Chemistry A European J

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Three-dimensional (3D) nanometal films serving as current collectors have attracted much interest recently owing to their promising application in high-performance supercapacitors. In the process of the electrochemical reaction, the 3D structure can provide a short diffusion path for fast ion transport, and the highly conductive nanometal may serve as a backbone for facile electron transfer. In this work, a novel polypyrrole (PPy) shell@3D-Ni-core composite is developed to enhance the electrochemical performance of conventional PPy. With the introduction of a Ni metal core, the as-prepared material exhibits a high specific capacitance (726 F g(-1) at a charge/discharge rate of 1 A g(-1)), good rate capability (a decay of 33% in Csp with charge/discharge rates increasing from 1 to 20 A g(-1)), and high cycle stability (only a small decrease of 4.2% in Csp after 1000 cycles at a scan rate of 100 mV s(-1)). Furthermore, an aqueous symmetric supercapacitor device is fabricated by using the as-prepared composite as electrodes; the device demonstrates a high energy density (≈21.2 Wh kg(-1)) and superior long-term cycle ability (only 4.4% and 18.6% loss in Csp after 2000 and 5000 cycles, respectively).

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Nanopeapods by Galvanic Displacement Reaction

Cited by 14 publications

References 36 publications

Surfactant-Free Synthesis of Bi₂Te₃−Te Micro−Nano Heterostructure with Enhanced Thermoelectric Figure of Merit

Surfactant-Free Synthesis of Bi₂Te₃−Te Micro−Nano Heterostructure with Enhanced Thermoelectric Figure of Merit

The Role of Surface Nonuniformity in Controlling the Initiation of a Galvanic Replacement Reaction

Polypyrrole Shell@3D‐Ni Metal Core Structured Electrodes for High‐Performance Supercapacitors

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Nanopeapods by Galvanic Displacement Reaction

Cited by 14 publications

References 36 publications

Surfactant-Free Synthesis of Bi2Te3−Te Micro−Nano Heterostructure with Enhanced Thermoelectric Figure of Merit

Surfactant-Free Synthesis of Bi2Te3−Te Micro−Nano Heterostructure with Enhanced Thermoelectric Figure of Merit

The Role of Surface Nonuniformity in Controlling the Initiation of a Galvanic Replacement Reaction

Polypyrrole Shell@3D‐Ni Metal Core Structured Electrodes for High‐Performance Supercapacitors

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Surfactant-Free Synthesis of Bi₂Te₃−Te Micro−Nano Heterostructure with Enhanced Thermoelectric Figure of Merit

Surfactant-Free Synthesis of Bi₂Te₃−Te Micro−Nano Heterostructure with Enhanced Thermoelectric Figure of Merit