Microwave synthesis and inherent stabilization of metal nanoparticles in 1-methyl-3-(3-carboxyethyl)-imidazolium tetrafluoroborate

Marquardt, Dorothea; Xie, Zailai; Taubert, Andreas; Thomann, Ralf; Janiak, Christoph

doi:10.1039/c1dt10795j

Cited by 57 publications

(31 citation statements)

References 46 publications

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“…The particles are stable in the absence of capping ligands (surfactants) for more than six months although some variation in particle size could be observed by TEM [78].…”

Section: Metal Nanoparticles From Metal Carbonyls M X (Co) Ymentioning

confidence: 99%

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Ionic Liquids for the Synthesis and Stabilization of Metal Nanoparticles

Janiak

2013

Zeitschrift Für Naturforschung B

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131

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The synthesis and stabilization of metal nanoparticles (M-NPs) from metals, metal salts, metal complexes and metal carbonyls in ionic liquids (ILs) is reviewed. The electrostatic and steric properties of ionic liquids allow for the stabilization of M-NPs without the need of additional stabilizers, surfactants or capping ligands. The synthesis of M-NPs in ILs can be carried out by chemical or electroreduction, thermolysis and photochemical methods including decomposition by microwave or sono-/ultrasound irradiation. Gas-phase syntheses can use sputtering, plasma/glow-discharge electrolysis and physical vapor deposition or electron beam and γ-irradiation. Metal carbonyl precursors M x (CO) y contain the metal atoms already in the zero-valent oxidation state needed for M-NPs so that no extra reducing agent is necessary. Microwave-induced thermal decomposition of precursors in ILs is a rapid and energy-saving access to M-NPs because of the significant absorption efficiency of ILs for microwave energy due to their ionic charge, high polarity and high dielectric constant. M-NP/IL dispersions can be applied in catalytic reactions, e. g., in C-C coupling or hydrogenation catalysis.

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“…The particles are stable in the absence of capping ligands (surfactants) for more than six months although some variation in particle size could be observed by TEM [78].…”

Section: Metal Nanoparticles From Metal Carbonyls M X (Co) Ymentioning

confidence: 99%

“…6) [76,77]. For both non-functionalized and functionalized ILs equally charged layers around the M-NPs lead to their separation through electrostatic repulsion and, thus, prevent their aggregation or Ostwald ripening [17,78].…”

Section: Metal Nanoparticles and Ionic Liquidsmentioning

confidence: 99%

Ionic Liquids for the Synthesis and Stabilization of Metal Nanoparticles

Janiak

2013

Zeitschrift Für Naturforschung B

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131

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“…28 Compared to these studies the Ce 0.5 Zr 0.5 O 2 prepared in ionic liquid via microwave heating reached this conversion at lower temperatures (100%, 350 1C). 32 For Ni-NPs, according to SAXS analysis the increase of the alkyl side-chain of the imidazolium ring from C 4 to C 14 leads to a decrease in size and in distance between Ni-NPs. 30 For WO 3 nanoparticles, the presence of the hydrogen bonding between the C2-H of the imidazolium ring and the oxygen of the metal oxide nanoparticles was verified by Raman measurements.…”

Section: View Article Onlinementioning

confidence: 99%

Energy efficient microwave synthesis of mesoporous Ce_0.5M_0.5O₂ (Ti, Zr, Hf) nanoparticles for low temperature CO oxidation in an ionic liquid – a comparative study

2015

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Ce 0.5 M 0.5 O 2 (M = Ti, Zr, Hf) nanoparticles have been successfully synthesized by microwave irradiation in the ionic liquid [C 4 mim][Tf 2 N] (1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide). The morphology, crystallinity, and chemical composition of the obtained materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, and N 2 -adsorption measurements. XRD and Raman spectroscopy analyses confirmed the formation of solid solutions with cubic fluorite structure. The catalytic activities of the Ce 0.5 M 0.5 O 2 (M = Ti, Zr, Hf) nanoparticles were investigated in the low-temperature oxidation of CO. Ce 0.5 Zr 0.5 O 2 nanospheres exhibit the best performance (100% conversion at 350 1C), followed by Ce 0.5 Hf 0.5 O 2 (55% conversion at 360 1C) and Ce 0.5 Ti 0.5 O 2 (11% conversion at 350 1C). Heating the as-prepared Ce 0.5 Zr 0.5 O 2 to 600 1C for extended time leads to a decrease in surface area and, as expected decreased catalytic activity. Depending on the ionic liquid the obtained Ce 0.5 Zr 0.5 O 2 exhibits different morphologies, varying from nano-spheres in [C 4 mim][Tf 2 N] and [P 66614 ][Tf 2 N] (P 66614 = trishexyltetradecylphosphonium) to sheet-like assemblies in [C 3 mimOH][Tf 2 N] (C 3 mimOH = 1-(3-hydroxypropyl)-3methylimidazolium). The microwave synthesis superiority to other heating methods like sonochemical synthesis and conventional heating was proven by comparative experiments where the catalytic activity of Ce 0.5 Zr 0.5 O 2 obtained by alternate methods such as conventional heating was found to be poorer than that of the microwave-synthesised material.

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“…The microwave assisted ionic liquid (MAIL) method has been used for the synthesis of metal, [6][7][8] metal oxide [9][10][11], metal fluoride [12], metal sulfide [13] and semiconductor nanoparticles [14]. However, there are few reports on the synthesis of QDs [15] by the (MAIL) method.…”

Section: Introductionmentioning

confidence: 99%

Microwave assisted synthesis of ZnS quantum dots using ionic liquids

et al. 2012

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Microwave synthesis and inherent stabilization of metal nanoparticles in 1-methyl-3-(3-carboxyethyl)-imidazolium tetrafluoroborate

Cited by 57 publications

References 46 publications

Ionic Liquids for the Synthesis and Stabilization of Metal Nanoparticles

Ionic Liquids for the Synthesis and Stabilization of Metal Nanoparticles

Energy efficient microwave synthesis of mesoporous Ce_0.5M_0.5O₂ (Ti, Zr, Hf) nanoparticles for low temperature CO oxidation in an ionic liquid – a comparative study

Microwave assisted synthesis of ZnS quantum dots using ionic liquids

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Microwave synthesis and inherent stabilization of metal nanoparticles in 1-methyl-3-(3-carboxyethyl)-imidazolium tetrafluoroborate

Cited by 57 publications

References 46 publications

Ionic Liquids for the Synthesis and Stabilization of Metal Nanoparticles

Ionic Liquids for the Synthesis and Stabilization of Metal Nanoparticles

Energy efficient microwave synthesis of mesoporous Ce0.5M0.5O2 (Ti, Zr, Hf) nanoparticles for low temperature CO oxidation in an ionic liquid – a comparative study

Microwave assisted synthesis of ZnS quantum dots using ionic liquids

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Energy efficient microwave synthesis of mesoporous Ce_0.5M_0.5O₂ (Ti, Zr, Hf) nanoparticles for low temperature CO oxidation in an ionic liquid – a comparative study