One pot oxidative cleavage of cyclohexene to adipic acid using silver tungstate nano-rods in a Brønsted acidic ionic liquid

Vafaeezadeh, Majid; Hashemi, Mohammed M.

doi:10.1039/c5ra02339d

Cited by 43 publications

(33 citation statements)

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“…Silver tungstate (Ag 2 WO 4 )-based materials constitute a particularly intensively researched family of inorganic compounds because of their particular crystal and electronic structures. [8][9][10][11][12] In response to their extensive range of innovative properties and practical applications, a plethora of experimental works have been published on the synthesis and properties of Ag 2 WO 4 -based materials, [13][14][15][16][17][18][19][20][21][22][23][24][25][26] and on their applications in photocatalysis, 17,19,20,25 catalysis, 14,18 photoluminescence, 9,13,15 sensors, 22 and as antibacterial agents. 21,23,26 Ag 2 WO 4 exhibits stunningly complex polymorphism, 27 and its understanding has evoked recent interest due to both fundamental scientic and technological aspects.…”

Section: Introductionmentioning

confidence: 99%

Uncovering the metastable γ-Ag₂WO₄phase: a joint experimental and theoretical study

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Uncovering the metastable γ-Ag₂WO₄phase: a joint experimental and theoretical study

et al. 2017

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“…Silver tungstate, α‐Ag 2 WO 4 , is a material that has received special attention from the scientific community because of its applications in a variety of fields such as photoluminescence, bactericide behavior, gas sensor, and photocatalytic activity …”

Section: Introductionmentioning

confidence: 99%

Formation of Ag nanoparticles under electron beam irradiation: Atomistic origins from first‐principles calculations

Andrés

Gouveia

Gracia

et al. 2017

Int J of Quantum Chemistry

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The formation of Ag nanoparticles is currently a topic subject to a great deal of research because they are excellent materials with many technological applications. Recently, the formation of Ag nanoparticles on a-Ag 2 WO 4 semiconductors induced by electron irradiation has been reported, but the mechanism underlying the transformations remains elusive. The aim of this article is to describe the mechanisms of electron beam irradiation on a-Ag 2 WO 4 and its transformation to form Ag nanoparticles in vacuum conditions. To this end, a combined study involving experiments and multiscale computational approaches (density functional theory calculations and molecular dynamics simulations) is presented. With the increasing interplay between experimental and computational approaches at multiple length scales, we will also discuss how these combined data can be used to provide a deep insight into the rationalization of electron beam-induced transformations. This phenomenon is likely to be promoted by electron charge redistribution in these materials due to electronic excitations combined with the formation of silver vacancies under electron beam irradiation. As this mechanism should be relevant to other Ag-based materials, our results provide pointers for the further development and optimization of electron beammediated engineering of the atomic structure and electronic properties at the atomic resolution. K E Y W O R D Sa-Ag 2 WO 4 , Ag nanoparticles, electron beam irradiation, first-principles calculations, plasmons | I N TR ODU C TI ONIn recent years, a strong continuous effort has been made in the synthesis of Ag nanoparticles (NPs) due to their remarkable properties and exciting applications in areas such as photonics, electronics, photocatalysis, sensing, and biomedicine. [1][2][3][4][5][6][7][8][9][10][11][12] The possibility of building new materials byThis article is dedicated to our colleague and friend, Prof. Nino Russo, as a tribute on the occasion of his 70th birthday. We hereby take this opportunity to convey our most heartfelt congratulations to an excellent person and a great researcher who possesses a privileged vision of interpersonal relations, teachinglearning processes, and technical-scientific innovations. combining metallic Ag with a semiconductor gives rise to a broad spectrum of synergistic and complementary properties that enable new applications to be developed, and many studies have revealed that the deposition of Ag on semiconductors enhances their photocatalytic activity due to the particular properties of Ag-based photocatalysts. [13,14] This phenomenon is related to the surface plasmon resonance, which improves the separation of the electron-hole pair. [15][16][17][18][19][20][21][22][23][24] The controlled combination of these two different materials is an interesting challenge, in which Ag NPs on the contact interface trigger structural and electronic variations that affect the photocatalytic performance of the semiconductor by increasing the electron-hole separation and then th...

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“…Primarily, this is because these phenomena occur too rapidly to be detected on the nanocrystal surfaces. Very recently, using an electron beam in an electron microscope under high vacuum, we identified the formation and growth of Ag nanoparticles on α-Ag 2 WO 4 [51][52][53][54][55][56][57] [61], and other authors have also reported interest in these fascinating systems [62][63][64][65][66][67][68][69][70][71]. Much of the applications of the aforementioned Ag materials are based on their photoluminescence properties [51] and bactericidal/antibacterial effect (which allows their use in clinical sterilization) [55].…”

Section: Introductionmentioning

confidence: 99%

In situgrowth of Ag nanoparticles onα-Ag₂WO₄under electron irradiation: probing the physical principles

et al. 2016

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Exploiting the plasmonic behavior of Ag nanoparticles grown on α-Ag 2 WO 4 is a widely employed strategy to produce efficient photocatalysts, ozone sensors, and bactericides. However, a description of the atomic and electronic structure of the semiconductor sites irradiated by electrons is still not available. Such a description is of great importance to understand the mechanisms underlying these physical processes and to improve the design of silver nanoparticles to enhance their activities. Motivated by this, we studied the growth of silver nanoparticles to investigate this novel class of phenomena using both transmission electron microscopy and field emission scanning electron microscopy. A theoretical framework based on density functional theory calculations (DFT), together with experimental analysis and measurements, were developed to examine the changes in the local geometrical and electronic structure of the materials. The physical principles for the formation of Ag nanoparticles on α-Ag 2 WO 4 by electron beam irradiation are described. Quantum mechanical calculations based on DFT show that the (001) of α-Ag 2 WO 4 displays Ag atoms with different coordination numbers. Some of them are capable to diffuse out of the surface with a very low energy barrier (less than 0.1 eV), thus, initiating the growth of metallic Ag nanostructures and leaving Ag vacancies into the bulk material. These processes increase the structural disorder of α-Ag 2 WO 4 as well as its electrical resistance as observed in the experimental measurements.S Online supplementary data available from stacks.iop.org/NANO/0/000000/mmedia

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One pot oxidative cleavage of cyclohexene to adipic acid using silver tungstate nano-rods in a Brønsted acidic ionic liquid

Abstract: The first catalytic application of silver tungstate is disclosed for the synthesis of adipic acid from the oxidative cleavage of cyclohexene.

Cited by 43 publications

References 32 publications

Uncovering the metastable γ-Ag₂WO₄phase: a joint experimental and theoretical study

Uncovering the metastable γ-Ag₂WO₄phase: a joint experimental and theoretical study

Formation of Ag nanoparticles under electron beam irradiation: Atomistic origins from first‐principles calculations

In situgrowth of Ag nanoparticles onα-Ag₂WO₄under electron irradiation: probing the physical principles

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One pot oxidative cleavage of cyclohexene to adipic acid using silver tungstate nano-rods in a Brønsted acidic ionic liquid

Abstract: The first catalytic application of silver tungstate is disclosed for the synthesis of adipic acid from the oxidative cleavage of cyclohexene.

Cited by 43 publications

References 32 publications

Uncovering the metastable γ-Ag2WO4phase: a joint experimental and theoretical study

Uncovering the metastable γ-Ag2WO4phase: a joint experimental and theoretical study

Formation of Ag nanoparticles under electron beam irradiation: Atomistic origins from first‐principles calculations

In situgrowth of Ag nanoparticles onα-Ag2WO4under electron irradiation: probing the physical principles

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Uncovering the metastable γ-Ag₂WO₄phase: a joint experimental and theoretical study

Uncovering the metastable γ-Ag₂WO₄phase: a joint experimental and theoretical study

In situgrowth of Ag nanoparticles onα-Ag₂WO₄under electron irradiation: probing the physical principles