Synthesis of silver–graphene nanocomposite and its catalytic application for the one-pot three-component coupling reaction and one-pot synthesis of 1,4-disubstituted 1,2,3-triazoles in water

Salam, Noor; Sinha, Arjyabaran; Roy, Anupam Singha; Mondal, Paramita; Jana, Nikhil R.; Islam, Sk. Manirul

doi:10.1039/c3ra47466f

Cited by 108 publications

(61 citation statements)

References 68 publications

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“…12,13 The adsorption of metal nanoparticles onto the surface of carbon allotropes including nanotube and graphene oxide is also postulated to enhance the overall stability of nanoparticle catalysts and often used as the strategy for various catalytic reactions. 14–19 However, systematic studies regarding the stability of nanoparticle–graphene oxide hybrid materials under elevated temperatures are currently lacking in the literature, despite the frequent use of annealing or calcination to remove surface adsorbed organic species from the nanoparticle surfaces for the activation of metal nanoparticle catalysts. 20–22 …”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide-Promoted Reshaping and Coarsening of Gold Nanorods and Nanoparticles

Pan

Low

Weerasuriya

et al. 2015

ACS Appl. Mater. Interfaces

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This paper describes thermally induced reshaping and coarsening behaviors of gold nanorods and nanoparticles immobilized on the surface of graphene oxide. Cetyltrimethylammonium bromide-stabilized gold nanorods with an aspect ratio of ~3.5 (54:15 nm) and glutathione-capped gold nanoparticles with an average core size of ~3 nm were synthesized and self-assembled onto the surface of graphene oxide. The hybrid materials were then heated at different temperatures ranging from 50 to 300 °C. The effects of heat treatments were monitored using UV–vis spectroscopy and transmission electron microscopy (TEM). These results were directly compared with those of heat-treated free-standing gold nanorods and nanoparticles without graphene oxide to understand the heat-induced morphological changes of the nanohybrids. The obtained results showed that the gold nanorods would undergo a complete reshaping to spherical particles at the temperature of 50 °C when they are assembled on graphene oxide. In comparison, the complete reshaping of free-standing gold nanorods to spherical particles would ultimately require a heating of the samples at 200 °C. In addition, the spherical gold nanoparticles immobilized on graphene oxide would undergo a rapid coarsening at the temperature of 100–150 °C, which was lower than the temperature (150–200 °C) required for visible coarsening of free-standing gold nanoparticles. The results indicated that graphene oxide facilitates the reshaping and coarsening of gold nanorods and nanoparticles, respectively, during the heat treatments. The stripping and spillover of stabilizing ligands promoted by graphene oxide are proposed to be the main mechanism for the enhancements in the heat-induced transformations of nanohybrids.

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Section: Introductionmentioning

confidence: 99%

Graphene Oxide-Promoted Reshaping and Coarsening of Gold Nanorods and Nanoparticles

Pan

Low

Weerasuriya

et al. 2015

ACS Appl. Mater. Interfaces

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“…12). In their approach, the catalysts were very stable and showed no silver leaching or aggregation, and were reused at least 5 times without loss of catalytic activity [95]. However when the AAC reaction is said to be catalyzed by Ag-based catalysts or other metal catalysts, caution is appropriate, because trace amount of copper contaminants could be enough to catalyze the AAC reactions.…”

Section: The Agaac Reactionsmentioning

confidence: 99%

Metal-catalyzed azide-alkyne “click” reactions: Mechanistic overview and recent trends

Changlong

Ikhlef

Kahlal

et al. 2016

Coordination Chemistry Reviews

293

162

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Highlights-The review is focused on the mechanistic aspects and recent trends (since 2012) of the metal-catalyzed azide-alkyne cycloaddition (MAAC) so-called "click" reactions with catalysts based on various metals (Cu, Ru, Ag, Au, Ir, Ni, Zn, Ln), although Cu (I) catalysts are still the most used ones.-These MAAC reactions are by far the most common click reactions relevant to the "green chemistry" concept.-Mechanistic investigations are essential to reaction improvements and subsequent applications, and indeed as shown in this review the proposed mechanisms have been multiple during the last decade based on theoretical computations and experimental search of intermediates.-New trends are also presented here often representing both exciting approaches for various applications and new challenges for further mechanistic investigations.

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“…high SERS activity of silver and large specific surface area of graphene. [558][559][560] Recently, Khan et al have described the synthesis of HRG/Ag nanocomposites using a Pulicaria glutinosa plant extract as reducing agent (cf. Fig.…”

Section: Surface-enhanced Raman Scattering Substratesmentioning

confidence: 99%

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

et al. 2015

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Synthesis of silver–graphene nanocomposite and its catalytic application for the one-pot three-component coupling reaction and one-pot synthesis of 1,4-disubstituted 1,2,3-triazoles in water

Cited by 108 publications

References 68 publications

Graphene Oxide-Promoted Reshaping and Coarsening of Gold Nanorods and Nanoparticles

Graphene Oxide-Promoted Reshaping and Coarsening of Gold Nanorods and Nanoparticles

Metal-catalyzed azide-alkyne “click” reactions: Mechanistic overview and recent trends

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

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