Synthesis of Small Au–Ag Core–Shell Cubes, Cuboctahedra, and Octahedra with Size Tunability and Their Optical and Photothermal Properties

Chiang, Chieh Chun; Huang, Michael H.

doi:10.1002/smll.201502513

Cited by 25 publications

(23 citation statements)

References 33 publications

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“…Their clean surfaces have enabled the evaluation of facet effects on organocatalysis with product selectivity . Similarly, bimetallic Au–Pd and Au–Ag core–shell nanocrystals with tunable shapes and sizes can also be prepared in aqueous solutions and be used for facet‐dependent catalytic examinations . It has been shown that Pd nanocrystals are not only useful in various organic reactions but they can also be applied for hydrogen gas production through dehydrogenation of ammonia borane (NH 3 BH 3 ) .…”

Section: Figurementioning

confidence: 99%

Facet‐Dependent and Light‐Assisted Efficient Hydrogen Evolution from Ammonia Borane Using Gold–Palladium Core–Shell Nanocatalysts

et al. 2016

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Au-Pd core-shell nanocrystals with tetrahexahedral (THH), cubic,a nd octahedral shapes and comparable sizes were synthesized. Similar-sized Au and Pd cubes and octahedra were also prepared. These nanocrystals were used for the hydrogen-evolution reaction (HER) from ammonia borane. Light irradiation can enhance the reaction rate for all the catalysts.I np articular,A u-Pd THH exposing {730} facets showed the highest turnover frequency for hydrogen evolution under light with 3-fold rate enhancement benefiting from lattice strain, modified surface electronic state,and abroader range of light absorption. Finite-difference time-domain (FDTD) simulations show astronger electric field enhancement on Au-Pd core-shell THH than those on other Pd-containing nanocrystals.Light-assisted nitro reduction by ammonia borane on Au-Pd THH was also demonstrated. Au-Pd tetrahexahedra supported on activated carbon can act as asuperior recyclable plasmonic photocatalyst for hydrogen evolution.Plasmonic metal nanocrystals such as Au,A g, and Pd have been synthesized in aqueous solutions with well-defined shapes,s uch as cubic and octahedral structures. [1][2][3][4][5][6][7] Their clean surfaces have enabled the evaluation of facet effects on organocatalysis with product selectivity. [8][9][10] Similarly,b imetallic Au-Pd and Au-Ag core-shell nanocrystals with tunable shapes and sizes can also be prepared in aqueous solutions and be used for facet-dependent catalytic examinations. [11][12][13][14][15][16] It has been shown that Pd nanocrystals are not only useful in various organic reactions but they can also be applied for hydrogen gas production through dehydrogenation of ammonia borane (NH 3 BH 3 ). [17][18][19][20][21][22] Ammonia borane (AB) is apromising hydrogen-storage material because of its high hydrogen storage capacity (19.6 wt %) among all practical hydrogenstorage materials. [23,24] It is highly soluble in water and inert toward hydrolysis,b ut produces hydrogen gas only in the presence of as uitable catalyst. [17][18][19][20][25][26][27][28] Development of simple and highly efficient catalysts for the dehydrogenation of AB is desirable.Previous notable examples used sub-10 nm spherical Pd and CoPd alloy nanoparticles to catalyze this reaction. [17][18][19][20] Facet effects on catalytic efficiencyh ave not been examined for this reaction. It should be interesting to use cubic and octahedral Pd nanocrystals for the dehydrogenation of AB.In addition to employing pure Pd nanocrystals as the catalyst, use of polyhedral Au-Pd core-shell heterostructures for hydrogen generation can be advantageous because Pd surface property can be modified slightly by the Au cores,and the particles can absorb aw ider range of visible light. Such nanostructures can be used in plasmonic photocatalysis to improve catalytic efficiency. Fore xample,b imetallic AuPd nanowheels can serve as ah ighly efficient catalyst in the oxidation of benzyl alcohol and Suzuki coupling reaction under light irradiation.[29] Pd-tipped Au nanorods have exhib...

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Section: Figurementioning

confidence: 99%

Facet‐Dependent and Light‐Assisted Efficient Hydrogen Evolution from Ammonia Borane Using Gold–Palladium Core–Shell Nanocatalysts

et al. 2016

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“…In the past decade, bimetal nano-heterostructures have emerged as an important class of multifunctional nanomaterials [11][12][13][14][15][16]. Benefiting from the strong coupling between two metals, bimetal nano-heterostructures often exhibit superior performance to their monometallic counterparts in a deal of applications, e.g., catalysis, sensing, disease diagnosis and therapy, and so on [17][18][19][20][21][22][23]. Though diversified strategies have been developed to construct various bimetal nano-heterostructures, it remains a great challenge to produce asymmetric bimetal nano-heterostructures, as crystal structures of metals are usually of high symmetry.…”

Section: Introductionmentioning

confidence: 99%

Origin of symmetry breaking in the seed-mediated growth of bi-metal nano-heterostructures

Pei

Jiang

et al. 2018

Science Bulletin

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“…Compared to the more successful developments in the aqueous phase synthesis of polyhedral Au, Ag, and Pd nanocrystals, [1][2][3][4][5][6][7][8] coppern anocubes and octahedra have mainly been synthesized in hydrophobic organic media at very high temperatures. [9][10][11][12] Cu nanocubes have also been made in anhydrous ethylene glycol in the presence of poly(vinylpyrrolidone).…”

Section: Introductionmentioning

confidence: 99%

Aqueous‐Phase Synthesis of Size‐Tunable Copper Nanocubes for Efficient Aryl Alkyne Hydroboration

Thoka

Madasu

Hsia

et al. 2017

Chemistry An Asian Journal

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Copper nanocubes with average sizes of 82, 95, and 108 nm have been synthesized in an aqueous mixture of cetyltrimethylammonium chloride (CTAC) surfactant, copper acetate, and sodium ascorbate reductant heated at 100 °C for 40 min. Copper nanowires with an average length of 25 μm can also be prepared this way by simply increasing the volume of sodium ascorbate introduced. Small shifts in the plasmonic absorption band positions with tunable particle sizes have been observed. The copper nanocubes were employed to catalyze hydroboration of phenylacetylene and various substituted aryl alkynes with 100 % (E)-product selectivity and 82-95 % product yields. The copper nanocubes are cheap to make and should catalyze a broad scope of organic coupling reactions.

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Synthesis of Small Au–Ag Core–Shell Cubes, Cuboctahedra, and Octahedra with Size Tunability and Their Optical and Photothermal Properties

Abstract: Aqueous phase synthesis of small Au-Ag core-shell nanocubes, cuboctahedra, and octahedra is achieved through the deposition of Ag shells on small octahedral Au cores. These nanocrystals show efficient photothermal activity and can assemble into supercrystals.

Cited by 25 publications

References 33 publications

Facet‐Dependent and Light‐Assisted Efficient Hydrogen Evolution from Ammonia Borane Using Gold–Palladium Core–Shell Nanocatalysts

Facet‐Dependent and Light‐Assisted Efficient Hydrogen Evolution from Ammonia Borane Using Gold–Palladium Core–Shell Nanocatalysts

Origin of symmetry breaking in the seed-mediated growth of bi-metal nano-heterostructures

Aqueous‐Phase Synthesis of Size‐Tunable Copper Nanocubes for Efficient Aryl Alkyne Hydroboration

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