Laser and electron beam-induced formation of Ag/Cr structures on Ag<sub>2</sub>CrO<sub>4</sub>

Lemos, Pablo S.; S., Silva G.; Roca, Román Alvarez; Assis, Marcelo; Torres–Mendieta, Rafael; Beltrán‐Mir, Héctor; Mínguez‐Vega, Gladys; Cordoncillo, Eloísa; Andrés, Juán; Longo, Elson

doi:10.1039/c8cp07263a

Cited by 20 publications

(2 citation statements)

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“…Ag2CrO4 was synthesized according to the co-precipitation method previously reported in the literature. 214 α-Ag2WO4 and α-AgVO3 were prepared according to literature methods as well. [215][216] Chitosan, silanes and alcohols, including anhydrous methanol, were obtained from commercial sources (Sigma Aldrich) and were used as received, while n-propanol and n-hexanol were dried over molecular sieves prior to be used.…”

Section: Reagentsmentioning

confidence: 99%

Unraveling a Biomass-Derived Multiphase Catalyst for the Dehydrogenative Coupling of Silanes with Alcohols under Aerobic Conditions

Sorribes

Ventura‐Espinosa

Assis

et al. 2021

ACS Sustainable Chem. Eng.

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Herein, a novel silver and chromium nanostructured N-doped carbonaceous material has been synthesized by a biomass-annealing approach using readily available chitosan as a raw material. The resulting catalyst AgCr@CN-800 has been applied for the dehydrogenative coupling reaction of various silanes with different alcohols to obtain the corresponding silyl ethers under aerobic and mild conditions. Besides excellent activity and selectivity, the as-prepared catalyst exhibits good stability and reusability. Characterization by XRD, XPS, ICP-MS, HRTEM, in combination with careful examination of the structure with Cs-corrected HAADF-STEM revealed that catalyst AgCr@CN-800 comprises Ag and CrN aggregated particles, as well as highly dispersed Ag-Nx and Cr-Nx sites embedded in N-doped graphitic structures. A comparative catalytic study using structure-related catalysts in combination with acid-leaching treatments has shown that the most active species are the Ag particles, and that their activity is boosted by the presence of Cr-derived species. By in-situ Raman spectroscopy experiments, it has been found that the dehydrogenative coupling of silanes with alcohols in the presence of catalyst AgCr@CN-800 takes place through an oxygen-assisted mechanism.

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Section: Reagentsmentioning

confidence: 99%

Unraveling a Biomass-Derived Multiphase Catalyst for the Dehydrogenative Coupling of Silanes with Alcohols under Aerobic Conditions

Sorribes

Ventura‐Espinosa

Assis

et al. 2021

ACS Sustainable Chem. Eng.

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“…[13][14][15] We have reported four new phenomena caused by femtosecond laser irradiation, enabling the fabrication of new complex nanoensembles, such as (i) the scale-up of the formation of Ag nanoparticles on α-Ag2WO4 with bactericidal properties by femtosecond laser irradiation; 16,17 (ii) the formation of nanoparticles of In from the laser irradiation of InP; 18 (iii) the synthesis of stable and metastable phases of Bi nanoparticles; 19 (iv) the synthesis of Ag-Bi nanoalloys with high antibacterial activity by femtosecond laser irradiations, which is interesting for potential antimicrobial applications; 20 and (v) the laser and electron beam-induced formation of Ag/Cr structures on Ag 2 CrO 4 . 21 In addition, we have analyzed the nature of chemical interactions by developing a new protocol based on the chemical pressure approach to point out the connection between some topological features of the electron density and structural stability of InP, thus providing an efficient tool to predict the breaking and formation of chemical bonds provoked by electron irradiation. 22 The current understanding of the processes that emerge in a material upon interaction with a laser involves multiple time and length scales.…”

Section: Introductionmentioning

confidence: 99%

Evidence for the formation of metallic In after laser irradiation of InP

Cabral

Andrés

Machado

et al. 2019

Journal of Applied Physics

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Structural and electronic changes induced by laser irradiation are currently of interest owing to the possibility to tune the mechanical, optical, and transport properties of the irradiated materials. In this work, we investigate the effects of laser irradiation on indium phosphide, InP, by modifying the electronic temperature, T e , of the system within the density functional theory framework and performing molecular dynamics simulations to prove that the laser irradiation also provokes a local thermalization effect. We found that the process can be described by a two-stage mechanism. First, at low T e values (0-1.0 eV), the laser energy induces electronic transitions, while the InP lattice remains undisturbed and cool. In the second stage (with T e in the range of 1.0-4.0 eV), both electron-electron scattering and electronphonon coupling processes are triggered, increasing the energy of the lattice so as to provoke a Coulomb explosion, which changes some physical chemical properties of InP. The close agreement between the simulations helps explain the formation of metallic In as it is observed in the transmission electron microscopy images.

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Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

et al. 2020

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Periodic structures induced by electron irradiation are a unique phenomenon when electron beams irradiate on the surface of some materials. These periodic structures have potential for technological applications. However, the fuzzy nature of the electron-induced structuring hinders its further exploration in such applications. In this paper, novel Ag nanoparticle/AgX (X=Cl, Br and I) composites, with enhanced photocatalytic activity and low toxicological effects, were prepared, for the first time, using electron beam irradiation. The remarkable advantage of this approach is that the Ag nanoparticles/AgX composites can be easily prepared in one-step without the need for high-pressure conditions, surfactants, ionic liquids, or reducing agents. Furthermore, our method does not involve any toxic substances, which makes the as-synthesized samples highly applicable for technological applications. The structure, morphology and physicochemical properties of the Ag nanoparticles/AgX composites were studied using various characterization techniques. Using first-principles calculations based on density functional theory and the quantum theory of atoms in molecules, we reveal how the concentration of excess electrons in the AgX materials induces the formation of the Ag nanoparticles under electron beam irradiation. These results extend the fundamental understanding of the atomic process underlying the mechanism of AgÀ X bond rupture observed during the transformation induced via electron irradiation of the AgX crystals by increasing the total number of electrons in the bulk structure. Thus, our findings provide viable guidance for the realization of new materials for the degradation of contaminated wastewater with low toxicity.

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Laser and electron beam-induced formation of Ag/Cr structures on Ag₂CrO₄

Abstract: The interactions of silver chromate with a femtosecond laser and electron beam irradiations were investigated.

Cited by 20 publications

References 83 publications

Unraveling a Biomass-Derived Multiphase Catalyst for the Dehydrogenative Coupling of Silanes with Alcohols under Aerobic Conditions

Unraveling a Biomass-Derived Multiphase Catalyst for the Dehydrogenative Coupling of Silanes with Alcohols under Aerobic Conditions

Evidence for the formation of metallic In after laser irradiation of InP

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

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Laser and electron beam-induced formation of Ag/Cr structures on Ag2CrO4

Abstract: The interactions of silver chromate with a femtosecond laser and electron beam irradiations were investigated.

Cited by 20 publications

References 83 publications

Unraveling a Biomass-Derived Multiphase Catalyst for the Dehydrogenative Coupling of Silanes with Alcohols under Aerobic Conditions

Unraveling a Biomass-Derived Multiphase Catalyst for the Dehydrogenative Coupling of Silanes with Alcohols under Aerobic Conditions

Evidence for the formation of metallic In after laser irradiation of InP

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

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Product

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About

Laser and electron beam-induced formation of Ag/Cr structures on Ag₂CrO₄