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

Abstract

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

Synthesis and Characterization of Branched fcc/hcp Ruthenium Nanostructures and Their Catalytic Activity in Ammonia Borane Hydrolysis

“…[11][12][13][14] Another common method to make branched or hierarchical nanomaterials is to use a controlled seed to act as a core or template to control the growth of a branched or flower-like shell. [15][16][17][18][19][20][21] Branched and hierarchical nanoparticles give rise to less common crystal structures due to conditions of high strain or templating, which causes fcc metals to adopt hcp crystal structures. 14,22 With judicious reaction design, this form of polymorphism, which is uncommon in the bulk, can be induced on the nanoscale.…”

“…6,[44][45][46][51][52][53][54] In our experiments, the catalytic reaction was started by adding an which have been attributed previously to increased catalytic activity for branched, dendritic and porous nanoparticles. 18,[55][56] The metal carbonyls could also provide a possible dopant that could alter the catalytic properties of the particles. 57 Finally, the branched particles have the highest proportion of the fcc crystal structure present, which has been reported previously to result in enhanced catalytic activity.…”

Polyol Silver Nanowire Synthesis and the Outlook for a Green Process

“…AgNW has also been used in sensor and biosensor applications in which its photon-plasmon interaction and electromagnetic scattering characteristics are strongly depend on its size and morphology [30]. In the application of metal nanostructures as catalysts, their selectivity and activity strongly depend on the atomic arrangement and surface crystal plane [50]. Hemmati et al showed that conductive inks formulated with high aspect ratio AgNW (length of 30 μm and diameter of 40 and 90 nm) content as low as 3 wt.% provide highquality screen printing with sharp-line definition, which is difficult to achieve with low aspect ratio AgNW, micrometer-sized silver particles, or silver flake at the same content.…”

Multi‐Branched Plasmonic Gold Nanoechinus‐Based Triple Modal Bioimaging: An Efficient NIR‐to‐NIR Up and Down‐Conversion Emission and Photoacoustic Imaging

“…Several bimetallic multibranched mesoparticles of Au and Ag have also been reported in literature as an efficient SERS tool . A brief summary of branched shape noble metal nanoparticles, synthetic conditions, and their application were show in Table 1 We recently reported that multibranched gold nanoechinus (Au NEs) could be used for NIR light‐activated dual modal photodynamic and photothermal therapy in B16F0 melanoma tumor modal and further modified with gene silencing to cure deep tissue buried tumors …”