Shape-Controlled Platinum Nanocubes and Their Assembly into Two-Dimensional and Three-Dimensional Superlattices

Demortière, Arnaud; Launois, Pascale; Goubet, Nicolas; Albouy, Pierre‐Antoine; Petit, Christophe

doi:10.1021/jp802081n

Cited by 128 publications

(125 citation statements)

References 63 publications

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“…This observation is distinctive from the PtNi nanocrystals shown in Fig. 1A, indicating that the reduction might be conducted under kinetic control because the decahedral and icosahedral nanocrystals are supposed to be the most stable shapes for a fcc crystal under thermodynamic conditions [48][49][50]. As the reaction is continued (60 min), more and longer branches are observed to protrude from the corners of the nanocrystal seeds, and most of the nanocrystals have been completely transformed into urchin-like shapes (Fig.…”

Section: Synthesis Of Ptni Alloy Nanocrystalsmentioning

confidence: 80%

Facile synthesis of Pt3Ni alloy nanourchins by temperature modulation and their enhanced electrocatalytic properties

Chen

Sun

et al. 2015

Journal of Alloys and Compounds

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Section: Synthesis Of Ptni Alloy Nanocrystalsmentioning

confidence: 80%

Facile synthesis of Pt3Ni alloy nanourchins by temperature modulation and their enhanced electrocatalytic properties

Chen

Sun

et al. 2015

Journal of Alloys and Compounds

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“…The structural parameters play a crucial role in determining and optimizing the sensor-related properties (Calfen and Mann 2003;Tretyakov 2003;Rawle 2007;Perry and Carter 2006;Evans et al 2010;Colfen and Antonietti 2005;Demortière et al 2008;Shevchenko et al 2006;Koziej et al 2014;Ansari et al 2014). In order to achieve desired shape and size with enhanced functional properties, bottom-to-top wet chemical approach was undertaken to synthesize functional nanopowder for their chemical and biological studies.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of nanostructured framework of novel ZnBaO2 nanopowder via wet chemical approach and hepatocytotoxicity response

et al. 2015

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Wet synthetic process is an effective and facile method at low cost, environmentally benign process for easy scaling-up and then used for fabrication of multiutility devices. Self-assembling of nanobrick leads to architecture framework with new functional properties which help to make its vast applications as nanodevices with their intrinsic shape, size and functional properties. The bimetallic oxide nanostructure with phase structure was characterized by FTIR, UV-visible electronic absorption, XRD, thermal studies, SEM, TEM, DLS and fluorescence. Nanocrystalline ZnBaO 2 powder can be used due to its chemical stability and excellent transmission in the visible region. It was observed that the annealing rate plays an important role to redefine the structural and other physicochemical properties which finally help to change gel into crystalline functional properties with porosity. Wet chemical approach can be used for the synthesis of other metal oxide nanopowders which can be easily scale up for production level. Along with synthesis and characterization, we also assessed biological responses of human hepatocytes exposed to ZnBaO 2 nanopowder. Cell membrane permeability and ammonia detoxification were investigated against various concentrations of nanoparticles on in vitro cultured hepatocytes. Our results suggest that low concentrations (\40 lg/ml) of ZnBaO 2 nanopowder have no cytotoxic effect on hepatocytes viability, proliferation and detoxification, whereas concentrations above 40 lg/ml depict significant toxicity on cells.

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“…By our best knowledge, no report has appeared yet for the preparation of the smaller Pt cube than 3 nm with high shape selectivity. The plausible reason is as follows: the size of Pt nuclei with cuboctahedron shape already has reached 2-3 nm, and the growth of specific facets is difficult without size increase [14,22]. Thus, preparation of small Pt nuclei is essential to obtain small Pt cube, in conjunction with controlled growth of (111) facet of Pt nuclei.…”

Section: Preparation Of Small Pt Cube By the Control Of Growth Kineticsmentioning

confidence: 99%

Shape and Size Controlled Pt Nanocrystals as Novel Model Catalysts

Miyake

Miyabayashi

2011

Catal Surv Asia

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A tremendous development of nanotechnology enabled us to prepare precisely structure-controlled nanocrystals (NCs). Recently, such structure controlled NCs have been applied as model catalysts with controlled active sites to evaluate reaction mechanisms. Here, we review our recent works on preparation of shape controlled Pt NCs, such as cube and wire, and on application as model catalysts for olefin hydrogenation to assess active Pt sites. A hydrogen reduction method of Pt(II) ion was adopted in an aqueous phase to prepare Pt cube in the presence of shape forming agent (NaI) and organic protective agent (sodium polyacrylate or sodium succinate). We succeed to prepare Pt cube with high size and shape selectivity, followed by very small Pt cube of less than 3 nm. Such simultaneous control of both size and shape of Pt NCs has been successfully achieved by the sophisticated tuning of multiple conditions for the growth kinetics of Pt nuclei during hydrogen reduction of PtCl 4 2-in aq. N-, N-dimethylformamide (DMF) solution. The key strategy is to produce small Pt nuclei and to avoid the excessive growth of Pt nuclei, in conjunction with face selective adsorption of anionic protective and shape-forming agents by the control of solvent system. For the preparation of Pt nanowires with high anisotropy, template-assisted methods have been usually used. We have developed facile liquid phase preparation method at room temperature in air without any template. The key factors of the method are: firstly, to use aqueous organic solvent system to control solvent polarity; secondly, to use co-solvent DMF as shape forming agent; thirdly, to use excess NaBH 4 as a stabilizer of Pt nuclei to prevent formation of conventional particles. Single-crystalline Pt nanowires of 2 nm diameter and more than micron length were easily obtained by the reduction of Pt(IV) with excess NaBH 4 in water-DMF-toluene solution (1:8:5 volume ratio) in a short reaction period of 3 h. Then, we have applied shape-controlled Pt NCs protected with PAA prepared by our original methods, such as cube, tetrahedron and wire, as model catalysts for olefin (cis-and trans-stilbenes) hydrogenation in ethanol to evaluate the active facet of Pt catalysts; e.g., Pt(111) or Pt(100). The estimated TOF values for the hydrogenation of cis-and trans-stilbene decreased in the order: cube [ cuboctahedron [ tetrahedron * nanowire. This tendency indicates that Pt(100) show high activity compared with Pt(111). The result is compatible with measurement of XPS and Raman spectra, suggesting strong adsorption of reactant on Pt(100). Hydrogenation of olefins (1-hexene and cyclohexene) has been carried out over Pt cubes with different sizes (8.2-10.1 nm) as catalysts to get information about active sites of Pt catalysts, e.g., flat facet or edge/corner atoms. The results of similar TOF values among Pt cubes with different sizes imply that the active sites are flat facets.

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Shape-Controlled Platinum Nanocubes and Their Assembly into Two-Dimensional and Three-Dimensional Superlattices

Cited by 128 publications

References 63 publications

Facile synthesis of Pt3Ni alloy nanourchins by temperature modulation and their enhanced electrocatalytic properties

Facile synthesis of Pt3Ni alloy nanourchins by temperature modulation and their enhanced electrocatalytic properties

Synthesis of nanostructured framework of novel ZnBaO2 nanopowder via wet chemical approach and hepatocytotoxicity response

Shape and Size Controlled Pt Nanocrystals as Novel Model Catalysts

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