Room‐Temperature Organometallic Synthesis of Soluble and Crystalline ZnO Nanoparticles of Controlled Size and Shape

Monge, Miguel; Kahn, Myrtil L.; Maisonnat, André; Chaudret, Bruno

doi:10.1002/anie.200351949

Cited by 220 publications

(146 citation statements)

References 25 publications

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“…As opposed to what was pointed out in other studies [33,41,43], the size and shape controls are not affected by the concentration of zinc precursor. Instead, the concentration of benzyl alcohol seems to play a role.…”

Section: Structural and Morphological Characterizationcontrasting

confidence: 99%

Solvent Dependent Shape and Magnetic Properties of Doped ZnO Nanostructures

Clavel

Willinger

Zitoun

et al. 2007

Adv Funct Materials

117

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This study reports on a new solution phase synthesis leading to cobalt and manganese doped ZnO which have been theoretically predicted ferromagnetic at room temperature. The solvothermal synthesis involving the reaction of zinc and cobalt acetate or manganese oleate with benzyl alcohol leads to pure inorganic nanoparticles that are diluted magnetic semiconductors. The addition of an inert solvent, that is used in order to control the amount of benzyl alcohol, drastically influences the particles morphology and strongly affects the magnetic behaviors. Cobalt doped particles are paramagnetic or ferromagnetic depending on the synthesis conditions. In order to exclude the formation of secondary phases and/or metal clusters and to understand the role of the solvent on the magnetic properties, the local structure of Co 2+ and Mn 2+ in the wurtzite ZnO matrix were characterized by XRD, UV-Visible diffuse reflectance and electron paramagnetic resonance.

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Section: Structural and Morphological Characterizationcontrasting

confidence: 99%

Solvent Dependent Shape and Magnetic Properties of Doped ZnO Nanostructures

Clavel

Willinger

Zitoun

et al. 2007

Adv Funct Materials

117

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“…We recently reported a direct organometallic route to prepare ZnO colloidal solutions containing nanoparticles of controlled size and shape. 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.…”

Section: Introductionmentioning

confidence: 95%

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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“…41,42 It consists in the addition of Zn(c-C 6 H 11 ) 2 solid to a THF solution containing the lithium (sodium) precursor and octylamine (OA) as stabilizer. The proportion of Li (Na) was varied from 1 to 10 mol% compared to Zn.…”

Section: Synthesismentioning

confidence: 99%

“…28,29,37 In previous works, we evidenced the interest of an organometallic synthesis based on the Zn(c-C 6 H 11 ) 2 complex for the preparation of ZnO nanoparticles of controlled size and shape. 41,42 This method takes advantage of the exothermic reaction of the organometallic precursor with water, the kinetics of which is well controlled by the ligand present in the reaction solution. Importantly, this method only leads to the formation of ZnO nanoparticles and cyclohexane.…”

Section: Introductionmentioning

confidence: 99%

Lithium ion as growth-controlling agent of ZnO nanoparticles prepared by organometallic synthesis

et al. 2008

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao. (series 3) were used. Interestingly, Li precursors induce a modification of the growth of the particles while, no effect is observed when Na precursors is used. Indeed, isotropic nanoparticles were obtained when Li precursors were used while nanorods were formed with Na precursor as already observed in the same experimental conditions without alkali-metal precursor.Observations by TEM show that as the Li/Zn molar ratio increases, the mean diameters of the nanoparticles vary from 3.7 AE 0.7 nm to 2.5 AE 0.4 nm, and from 4.3 AE 1.0 nm to 3.1 AE 0.8 nm for series 1 and series 2, respectively, while the length and the diameter of the nanorods are ca. 11 Â 4 nm, for series 3. Interestingly, the consequence of the lithium induced size variation leads to a shift of the emission band in the visible range, from yellow to blue through white as a function of increasing concentration of lithium precursor. The intensity of this emission is strong enough to be clearly seen by the human eye.

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Room‐Temperature Organometallic Synthesis of Soluble and Crystalline ZnO Nanoparticles of Controlled Size and Shape

Cited by 220 publications

References 25 publications

Solvent Dependent Shape and Magnetic Properties of Doped ZnO Nanostructures

Solvent Dependent Shape and Magnetic Properties of Doped ZnO Nanostructures

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

Lithium ion as growth-controlling agent of ZnO nanoparticles prepared by organometallic synthesis

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