Selective synthesis, characterization, and spectroscopic studies on a novel class of reduced platinum and palladium particles stabilized by carbonyl and phosphine ligands

Amiens, Catherine; de, Dominique; Chaudret, Bruno; Bradley, John S.; Mazel, Robert; Roucau, C.

doi:10.1021/ja00077a089

Cited by 109 publications

(62 citation statements)

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“…38 We have also shown that dibenzylideneacetone derivatives of palladium and platinum can be used as precursors to yield metal nanoparticles of uniform sizes in the range 1.2-2.5 nm by submitting solutions of these compounds to CO or H 2 in the presence of a stabilizing agent as such as polymers or organic ligands. [39][40][41] We demonstrate in this paper that these Pd and Pt organometallic complexes can effectively be used as precursors to surface doping tin nanoparticles through very mild conditions and with an accurate control of morphology. The reaction with CO of [Pt 2 (dba) 3 ] or [Pd(dba) 3 ] in anisole containing tin nanoparticles indeed leads to the formation of tin/platinum or tin/palladium nanoparticles.…”

Section: Introductionmentioning

confidence: 82%

Organometallic approach for platinum and palladium doping of tin and tin oxide nanoparticles: structural characterisation and gas sensor investigations

et al. 2006

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Platinum and palladium surface doped tin nanoparticles have been obtained by decomposition of [Pt 2 (dba) 3 ] and [Pd(dba) 2 ] organometallic precursors, respectively, in a colloidal suspension of tin/ tin oxide core-shell nanoparticles of uniform size (E13 nm), in anisole under 1 bar of carbon monoxide at room temperature. The particles can be isolated as pure solids and present effective doping ratios [Pt]/[Sn] and [Pd]/[Sn] of 2.5 and 3.1%, respectively. These nanomaterials have been characterized by means of transmission electron and high-resolution transmission electron microscopies (TEM and HRTEM), Energy Dispersive X-ray spectroscopy (EDX), photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (EXAFS and XANES). The TEM micrographs show spherical nanoparticles whose size and size distribution are essentially similar to those of the initial Sn/SnO x material. HRTEM, EDX, XPS and X-ray absorption spectroscopy (XAS) studies at the Pd and/or Sn-K edge show the conservation of the composite nature of the particles that consist of a tin(0) core covered with a layer of tin oxides on which the doping element is deposited under the form of crystalline metallic platelets of size near 2 nm. The thermal oxidation of these Pt-or Pd-doped tin materials yields nanoparticles of crystallized SnO 2 covered with crystallites of Pt or Pd oxides, as demonstrated by XRD, XPS and XAS experiments, without coalescence or size change. In the oxidised Pd-doped material, EXAFS analysis combined with HRTEM, point towards the formation of two main Pd disordered oxide phases: a rather pure oxopalladate Pd 3.5 O 4 -type phase at the surface of the particle and a mixed Pd/Sn phase having a PdO structure-type at the interface Pd oxide/Sn oxide. The thermal oxidation process can be easily achieved onto the silicon platform of a micro-machined device after integration of the Pt-or Pd-doped Sn/SnO x colloidal suspension by drop deposition. The first electrical measurements indicate remarkable behaviours of the as-obtained microsensors when exposed to traces of carbon monoxide. In addition to the expected large increase of sensitivity of the doped relatively to the undoped sensitive layer measured in humid atmosphere, a surprising and unprecedented inversion of sensitivity from undoped to Pt-and Pd-doped sensors has been observed in dry atmosphere.

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Section: Introductionmentioning

confidence: 82%

Organometallic approach for platinum and palladium doping of tin and tin oxide nanoparticles: structural characterisation and gas sensor investigations

et al. 2006

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“…Consequently, an effective synthetic technique is required to produce nanoparticles with controlled shape and small size within a few Angström standard deviations. The usual synthetic technique for making such nanoparticles involves chemical or electrochemical reduction of metal ions in the presence of a stabilizer such as linear polymers [9][10][11] and ligands [12][13][14][15][16] which prevent the nanoparticles from aggregation and allow isolation of the nanoparticles. To control the particle size and shape, various reductants, stabilizers, solvents etc., have been utilized in nanoparticle preparation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of synthesized platinum nanoparticles on the MCF-7 and HepG-2 cancer cell lines

et al. 2013

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Platinum nanoparticles (PNPs) were synthesized by chemical reduction of potassium hexachloroplatinate (IV) with trisodium citrate under vigorous stirring and addition of sodium dodecyl sulfate as stabilizer reagent. Reducing agent was chosen depending on the oxidation reactions and potential values of the chemical materials used in the experiment. The aim of this study is to investigate the effects of PNPs on the different cancer cell lines and cytotoxicity study of this nanomaterial. The morphology of PNPs was investigated by scanning electron microscope (XL30, Philips Electronics, Amsterdam, The Netherlands) with the ability to perform elemental analysis by EDX. Malvern Zetasizer 3000 HSA (Malvern Instruments, Worcestershire, UK) was used to determine the distribution of particle size and zeta potential of PNPs. The cytotoxicity property of the nanoparticles was evaluated by MTT assay on MCF-7 and HepG-2 cell lines, and the cytotoxic concentration 50% values were determined for 24 h.

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“…In anticipation of the covering with silica we investigated two stabilising agents: DPTES and PVP. The ability of the phosphine moiety of DPTES to bind to noble metals is well documented [26,27]. The use of DPTES modifies the surface of the particles such that silanol groups are exposed.…”

Section: Platinum Colloidsmentioning

confidence: 99%

Design of Colloidal Pt Catalysts Encapsulated by Silica Nano Membranes for Enhanced Stability in H2S Streams

et al. 2010

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Poisoning of platinum catalysts by sulphur compounds is a significant problem that prevents their application in untreated gas streams. We introduce a novel concept to circumvent the poisoning problem by encapsulating individual platinum nano-particles with silica layers that act as selective membranes. Greatly enhanced sulfur tolerance for sufficiently dense illustrates the potential of our approach to design noble metal catalysts that survive in sulphur containing gas streams.

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Selective synthesis, characterization, and spectroscopic studies on a novel class of reduced platinum and palladium particles stabilized by carbonyl and phosphine ligands

Cited by 109 publications

References 0 publications

Organometallic approach for platinum and palladium doping of tin and tin oxide nanoparticles: structural characterisation and gas sensor investigations

Organometallic approach for platinum and palladium doping of tin and tin oxide nanoparticles: structural characterisation and gas sensor investigations

Evaluation of synthesized platinum nanoparticles on the MCF-7 and HepG-2 cancer cell lines

Design of Colloidal Pt Catalysts Encapsulated by Silica Nano Membranes for Enhanced Stability in H2S Streams

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