Nanostructured copper oxides and phosphates from a new solid-state route

Dı́az, Carlos; Valenzuela, Marı́a Luisa; Lavayen, Vladimir; Mendoza, Karina; Pena, Dela; O’Dwyer, Colm

doi:10.1016/j.ica.2011.07.003

Cited by 30 publications

(24 citation statements)

References 53 publications

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“…The most likely mechanism for the formation of the Au/Ag superstructures may be similar to mechanisms that have been previously established as general for the solid-state pyrolysis of metallic and organometallic derivatives cyclicoligomer-phosphazene and polyphosphazense [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] . Figure 7 shows a schematic representation of the probable formation mechanism of the pyrolytic product.…”

Section: Probable Mechanism Formationmentioning

confidence: 82%

“…Coordination was confirmed by the behavior of the broad ν(OH) in Chitosan 20 which becomes unfolded upon coordination, and exhibiting a new band around 3100 cm -1 . PSPco-4-PVP coordination was evidenced by the appearance of a characteristic band in the range 1600-1650 cm -1 corresponding to coordinate pyridine 10,20 . Figure 1 Schematic representation of the solid-state method to obtain nanostructured materials from oligomeric and polymeric precursors.…”

Section: Precursors Synthesismentioning

confidence: 99%

“…In such case the solvent was eliminated at reduced pressure using a high vacuum pump and/or using a furnace with vacuum. PSP-co-4-PVP coordination was evidenced by the appearance of a characteristic band in the range 1600-1650 cm-1 corresponding to coordinate pyridine 10,20 . Elemental analyses (%) : …”

Section: General Procedures Psp-4-pvp/( Mln/m'ln)nmentioning

confidence: 99%

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Bimetallic Au/Ag Metal Superstructures From Macromolecular Metal Complexes in Solid-State

Dı́az

Valenzuela

Bobadilla

2013

J. Chil. Chem. Soc.

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Novel bimetallic Au/Ag superstructures have been prepared from solid-state pyrolysis of the macromolecular complexes Chitosan(MLn/M'Ln) n y PSP-4-PVP×( MLn/M'Ln)n with MLn = AuCl 3 and M'Ln = Ag(CF 3 SO 3 ).The characterization was made from XRD (X-ray diffraction of powder), SEM and EDS analysis. Morphologies are influenced by both the nature of the polymer and the metal/polymer, molar ratio of the polymer precursor. EDS analysis suggests a core/shell Au/Ag structure for the materials. A probable mechanism of the formation of these superstructures is discussed. Although separated reports of metallic superstructures of Au or Ag have been recently described, the here reported are the first bimetallic Au/Ag.

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Section: Probable Mechanism Formationmentioning

confidence: 82%

Section: Precursors Synthesismentioning

confidence: 99%

See 1 more Smart Citation

Bimetallic Au/Ag Metal Superstructures From Macromolecular Metal Complexes in Solid-State

Dı́az

Valenzuela

Bobadilla

2013

J. Chil. Chem. Soc.

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“…Synthesis of the macromolecular precursors Macromolecular precursors were prepared according preious works [37][38][39]. In a typical synthesis the respective metallic salt PtCl 2 was added in a Schlenk tube over the CH 2 Cl 2 (50 mL) solvent under magnetic stirring and then the respective polymer PSP-co-4-PVP and Chitosan was added amount according the 1:1 and 1:5 molar ratio for 15 days at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…In this work we report a novel solid-state method for the preparation of nanostructured Pt, from the pyrolysis of macromolecular precursors PSP-co-4-PVP•(PtCl 2 )n and Chitosan•(PtCl 2 )n 1:5 and 1:1 molar relationship [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Solid State Morphology and Size Tuning of Nanostructured Platinum Using Macromolecular Complexes

Dı́az

Valenzuela

Baez

et al. 2015

J. Chil. Chem. Soc.

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The macromolecular complexes Chitosan•(PtCl 2 ) n and PSP-co-4-PVP•(PtCl 2 ) n , were prepared from the respective polymer and PtCl 2 in metal:polymer molar ratios 1:1 and 1:5. Pyrolisis of the macromolecular complexes Chitosan•(PtCl 2 ) n and PSP-co-4-PVP•(PtCl 2 ) n at 800 °C under air affords cubic nanostructured Pt in the pure phase. The morphology of the pyrolityc products depends on the molar metal:polymer ratio; i.e. a "cotton" 3D shape for the 1:1 ratio and a "foamy" 3D shape for the 1:5 ratio. On the other hand, the particle size depends on the polymer nature, obtaining Pt nanoparticles as small as 6 nm for the chitosan precursors in both molar ratio.

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Bimetallic Au//Ag Alloys Inside SiO2 Using a Solid-State Method

et al. 2017

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Bimetallic Au/Ag nanostructures have been included inside SiO 2 by pyrolysis of the macromolecular complexes Chitosan(MLn/M'Ln) n •SiO 2 and PSP-4-PVP⋅(MLn/M'Ln)n•SiO 2 with MLn = AuCl 3 and M'Ln = Ag(CF 3 SO 3). The structural characterization was performed by XRD (X-ray diffraction of powder) and UV-vis, and the microstructural characterization was done by SEM/ EDS analysis HRTEM. The resulting products from the pyrolytic precursors PSP-4-PVP•(AuCl 3 /AgSO 3 CF 3) n •SiO 2 1:1 (1), PSP-4-PVP•(AuCl 3 /AgSO 3 CF 3) n •SiO 2 1:5 (2) , Chitosan•(AuCl 3 /AgSO 3 CF 3) n •SiO 2 1:1 (3) and Chitosan •(AuCl 3 /AgSO 3 CF 3) n •SiO 2 1:5 (4) were Au/Ag//SiO 2 , Au// SiO 2 and Ag// SiO 2 as well as isolated Au and Ag, depending on the polymeric precursor. The Chitosan polymer precursor induces mainly Ag and Ag/SiO 2 nanostructures, while PSP-4-PVP induces mainly Au/Ag nanostructures. This can be explained by the facility to link Ag + to the NH 2 and OH groups of Chitosan than to the pyridine of PSP-4-PVP. On the contrary, Au +3 exhibits most coordination ability to pyridine groups of PSP-4-PVP than NH 2-and OHgroups of Chitosan. EDS mapping analysis indicates a uniform distribution of the Au/Ag nanostructure inside the SiO 2 matrix. Using reflectance diffuse analysis, the plasmon is consistent with the Au/Ag alloys structure.

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Nanostructured copper oxides and phosphates from a new solid-state route

Cited by 30 publications

References 53 publications

Bimetallic Au/Ag Metal Superstructures From Macromolecular Metal Complexes in Solid-State

Bimetallic Au/Ag Metal Superstructures From Macromolecular Metal Complexes in Solid-State

Solid State Morphology and Size Tuning of Nanostructured Platinum Using Macromolecular Complexes

Bimetallic Au//Ag Alloys Inside SiO2 Using a Solid-State Method

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