Incorporation of Au and Ag Nanostructures Inside Sio2

Dı́az, Carlos; Valenzuela, Alejandra; Soto, K.; Laguna‐Bercero, M. A.

doi:10.4067/s0717-97072019000304502

Cited by 2 publications

(5 citation statements)

References 25 publications

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“…Interestingly, the macromolecular complex PS-4-co-PVP•(AuCl 3 ) n does not present this luminescent behavior. The pyrolysis of all these macromolecular precursors affords metallic Au • foams with pore size depending on the nature of the Au salt joined to the polymer chain [94] (Figure 10). Metallic sponges (or foams) of macroporous metals have attracted great attention due to their unusual and peculiar properties such as mechanical strength and stiffness [95].…”

Section: Goldmentioning

confidence: 99%

“…Several solution methods for preparing Ag • nanoparticles have been reported but relatively scarce from solid-state methods [96][97][98]. For Ag • containing precursors as Ag(CF 3 SO 3 )•Chitosan, Ag was obtained as shown in the XRD pattern [94]. Their morphology indicates a foam-like shape.…”

Section: Silvermentioning

confidence: 99%

“…As known in catalysis, the inclusion of M • , as well as MxOy inside solid matrices, induces stability of the catalytic material as well as a greater surface area of the catalyst within the solid matrix [139,140]. Au • and the bimetallic Au • /Ag • were incorporated in silica to give Au • //SiO 2 [94] and Au • /Ag • //SiO 2 [56].…”

Section: Incorporation Of Metallic and Metal Oxides Into Solid Matrixmentioning

confidence: 99%

“…The inclusion of the Ag • nanoparticles inside SiO 2 was also made by pyrolysis of the respective (PS-co-4-PVP)•(AgNO 3 ) n •(SiO 2 ) n and chitosan•(AgNO 3 ) n •(SiO 2 ) n precursors [94]. Well dispersed Ag nanoparticles inside SiO 2 were observed for the Ag/SiO 2 composites obtained from chitosan•(AgNO 3 )n•(SiO 2 ) m and (PS-co-4-PVP)•(AgNO 3 )n•(SiO 2 ) m , with particle sizes of 5 and 6 nm, respectively.…”

Section: Incorporation Of Metallic and Metal Oxides Into Solid Matrixmentioning

confidence: 99%

“…Figure 18.EDS mapping for the Au/Ag//SiO 2 composite from the macromolecular Chitosan•(AuCl 3 /AgSO 3 CF 3 ) n •SiO 2 precursor 1:1. Adapted from reference[94].…”

mentioning

confidence: 99%

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Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Dı́az

Valenzuela

Laguna‐Bercero

2022

IJMS

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Nanomaterials have attracted much attention over the last decades due to their very different properties compared to those of bulk equivalents, such as a large surface-to-volume ratio, the size-dependent optical, physical, and magnetic properties. A number of solution fabrication methods have been developed for the synthesis of metal and metal oxides nanoparticles, but few solid-state methods have been reported. The application of nanostructured materials to electronic solid-state devices or to high-temperature technology requires, however, adequate solid-state methods for obtaining nanostructured materials. In this review, we discuss some of the main current methods of obtaining nanomaterials in solid state, and also we summarize the obtaining of nanomaterials using a new general method in solid state. This new solid-state method to prepare metals and metallic oxides nanostructures start with the preparation of the macromolecular complexes chitosan·Xn and PS-co-4-PVP·MXn as precursors (X = anion accompanying the cationic metal, n = is the subscript, which indicates the number of anions in the formula of the metal salt and PS-co-4-PVP = poly(styrene-co-4-vinylpyridine)). Then, the solid-state pyrolysis under air and at 800 °C affords nanoparticles of M°, MxOy depending on the nature of the metal. Metallic nanoparticles are obtained for noble metals such as Au, while the respective metal oxide is obtained for transition, representative, and lanthanide metals. Size and morphology depend on the nature of the polymer as well as on the spacing of the metals within the polymeric chain. Noticeably in the case of TiO2, anatase or rutile phases can be tuned by the nature of the Ti salts coordinated in the macromolecular polymer. A mechanism for the formation of nanoparticles is outlined on the basis of TG/DSC data. Some applications such as photocatalytic degradation of methylene by different metal oxides obtained by the presented solid-state method are also described. A brief review of the main solid-state methods to prepare nanoparticles is also outlined in the introduction. Some challenges to further development of these materials and methods are finally discussed.

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Section: Goldmentioning

confidence: 99%

Section: Silvermentioning

confidence: 99%

Section: Incorporation Of Metallic and Metal Oxides Into Solid Matrixmentioning

confidence: 99%

Section: Incorporation Of Metallic and Metal Oxides Into Solid Matrixmentioning

confidence: 99%

“…Figure 18.EDS mapping for the Au/Ag//SiO 2 composite from the macromolecular Chitosan•(AuCl 3 /AgSO 3 CF 3 ) n •SiO 2 precursor 1:1. Adapted from reference[94].…”

mentioning

confidence: 99%

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Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Dı́az

Valenzuela

Laguna‐Bercero

2022

IJMS

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Matrix Effect of Properties of Au, ZnO and Eu2O3: Silica, Titania and Alumina Matrices

Díaz,

Cifuentes-Vaca,

Valenzuela

2023

Micro

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The composites Au/SiO2, Au/TiO2, Au/Al2O3, ZnO/TiO2, ZnO/TiO2, ZnO/Al2O3 and Eu2O3/SiO2, Eu2O3/TiO2 and Eu2O3/Al2O3 were prepared using a solid-state method. The effect of the polymer precursors was investigated using two precursor polymers, Chitosan and Poly(styrene-co-4vinylpyridine), (PS-co-4-PVP) in the M/MxLy•Chitosan//M’xO’y as well as M/MxLy•PS-co-4-PVP//M’xO’y with M’xO’y = SiO2, TiO2 and Al2O3. The effects on the particle size and morphology were observed. The new composites were characterized using X-ray powder diffraction, SEM-EDS mapping and HRTEM analysis. The distribution of the metallic nanoparticles as well as the metal oxide nanoparticles inside the matrices depend on the matrix. Marked optical and photocatalytic effects of the Au, ZnO and Eu2O3 inside the SiO2, TiO2 and Al2O3 matrices are expected. An experiment is in course.

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Incorporation of Au and Ag Nanostructures Inside Sio2

Cited by 2 publications

References 25 publications

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Matrix Effect of Properties of Au, ZnO and Eu2O3: Silica, Titania and Alumina Matrices

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