Stability of sputter-deposited gold nanoparticles in imidazolium ionic liquids

Vanecht, Evert; Binnemans, Koen; Patskovsky, Sergiy; Meunier, Michel; Seo, Jin Won; Stappers, Linda; Fransaer, Jan

doi:10.1039/c2cp23677j

Cited by 62 publications

(112 citation statements)

References 41 publications

(58 reference statements)

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“…An absorbance peak appears at a certain wavelength when nanoparticles are mono-dispersed, while the absorption wavelength shifts and the baseline increases when aggregates form. 84 The UV-vis spectra of gold nanoparticles exhibit a typical surface plasmon resonance (SPR) band at around 530 nm. 3.…”

Section: Characterization Of Nanoparticle Dispersion Stability In Ionmentioning

confidence: 99%

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Nanoparticles in ionic liquids: interactions and organization

Alexandridis

2015

Phys. Chem. Chem. Phys.

309

222

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Ionic liquids (ILs), defined as low-melting organic salts, are a novel class of compounds with unique properties and a combinatorially great chemical diversity. Ionic liquids are utilized as synthesis and dispersion media for nanoparticles as well as for surface functionalization. Ionic liquid and nanoparticle hybrid systems are governed by a combined effect of several intermolecular interactions between their constituents. For each interaction, including van der Waals, electrostatic, structural, solvophobic, steric, and hydrogen bonding, the characterization and quantitative calculation methods together with factors affecting these interactions are reviewed here. Various self-organized structures based on nanoparticles in ionic liquids are generated as a result of a balance of these intermolecular interactions. These structures, including colloidal glasses and gels, lyotropic liquid crystals, nanoparticle-stabilized ionic liquid-containing emulsions, ionic liquid surface-functionalized nanoparticles, and nanoscale ionic materials, possess properties of both ionic liquids and nanoparticles, which render them useful as novel materials especially in electrochemical and catalysis applications. This review of the interactions within nanoparticle dispersions in ionic liquids and of the structure of nanoparticle and ionic liquid hybrids provides guidance on the rational design of novel ionic liquid-based materials, enabling applications in broad areas.

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Section: Characterization Of Nanoparticle Dispersion Stability In Ionmentioning

confidence: 99%

“…3. 84 Several studies have considered gold nanoparticle synthesis and dispersion in imidazolium-based and pyrrolidinium-based ionic liquids. The suspension showed a red color at the time of synthesis, characteristic of gold nanoparticles.…”

Section: Characterization Of Nanoparticle Dispersion Stability In Ionmentioning

confidence: 99%

Nanoparticles in ionic liquids: interactions and organization

Alexandridis

2015

Phys. Chem. Chem. Phys.

309

222

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“…The shift of the SPR band to higher wavelengths has been attributed to aggregation of NPs. 31 The residual absorption at 800 nm for copper grown on a glass support has been attributed elsewhere to metallic particles surrounded by an oxide monolayer. 44,45 Figure 3A shows the evolution of peak absorbance at λ = 600 nm for copper particles as a function of time for three initial Cu(II) ion concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…[23][24][25] The ILs possess other unique properties such as low vapor pressure, wide liquidus range, highly ionic environment, wide electrochemical window and pre-organized structure. 26 Thus, the synthesis of NPs in ILs is becoming a very active field of research 20,[27][28][29][30][31][32][33][34] which has been reviewed in recent literature. [35][36][37][38][39] However, while the stability of NPs in ILs has been widely investigated, NPs growth mechanisms and kinetic aspects in these media are still not fully understood.…”

mentioning

confidence: 99%

Growth Behavior of Copper and Platinum Nanoparticles in an Imidazolium Based Ionic Liquid

Iflah

Zilbermann

Pevzner

et al. 2017

J. Electrochem. Soc.

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The formation of Cu and Pt nanoparticles in an imidazolium-based ionic liquid was followed by UV-Visible spectroscopy. The different growth processes, autocatalytic first order and oriented second order, for Cu and Pt, respectively, is attributed to the different chemical nature of the metal particles surface. Stabilization through layering of the particles surface by the ionic liquid has an important impact on the use of noble and non-noble metal nanoparticles in energy conversion systems such as fuel cells and CO 2 electrocatalytic reduction to useful fuels. Nanoparticles (NPs) possess unique optical, thermal, electronic, and catalytic properties which strongly depend on their size, shape, and monodispersity. [1][2][3][4][5][6][7] As such, there is an increasing interest of comprehending the complex process by which NPs are generated. NPs generation includes nucleation and growth processes. LaMer investigated the formation of sulfur sols and suggested nucleation which can occur until a nucleus of critical size is obtained. 8,9 Further growth on the nucleus according to this mechanism is spontaneous but diffusion limited. Finke and coworkers have disputed LaMer mechanism and proposed a continuous nucleation slow process followed by a subsequent autocatalytic surface growth process. [10][11][12] Ostwald ripening is another coarsening mechanism in which larger nanocrystals grow at the expense of smaller ones and is driven by the higher solubility of small NPs. 13,14 Coalescence between particles, known also as aggregation growth, has recently been revealed to play an important role in the NPs growth.15-18 Some in situ analytical techniques, such as small angle X-ray scattering, 15 optical spectroscopy which has been applied for semiconductor NPs,19 and TEM 20 have been used to clarify the different processes involved in the generation of NPs.The stability of metal NPs relies mainly on the steric and/or electronic protection provided by different types of water or organic solvent soluble stabilizers such as surfactants, polymers, quaternary ammonium salts, and polyoxoanions. 21,22 It has been reported in this respect that ionic liquids (ILs) stabilize NPs without adding a surface ligand and by means of their interaction with metals which is exclusive to their components structure. [23][24][25] The ILs possess other unique properties such as low vapor pressure, wide liquidus range, highly ionic environment, wide electrochemical window and pre-organized structure.26 Thus, the synthesis of NPs in ILs is becoming a very active field of research 20,27-34 which has been reviewed in recent literature. [35][36][37][38][39] However, while the stability of NPs in ILs has been widely investigated, NPs growth mechanisms and kinetic aspects in these media are still not fully understood. Imidazolium-based ILs form extended hydrogen bonds and a π-π stacking network. They are consequently highly structured and are described as "supramolecular" fluids. 26,40,41 This structured organization favors well-defined and extended ordering...

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“…[17][18][19] Electrochemical preparation of nanoparticles can be performed easily and inexpensively compared to other methods, including electron beam irradiation, chemical reduction, and sputtering. [20][21][22] However, electrochemical preparation of the nanoparticles of intermetallic compounds has not been attempted although it may be achieved by codeposition of different metals in RTILs. The nanoparticles of the compound semiconductors containing Se are also expected to be formed by electrochemical reduction of selenium species in RTILs while formation of Se(-II) may prevent codeposition of the compound semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Formation of Selenium Nanoparticle in an Amide-type Ionic Liquid

et al. 2018

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Electrochemical formation of selenium (Se) nanoparticles in an amide-type ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA) containing selenium tetrachloride (SeCl 4 ) was investigated in the presence of excess chloride anion on a glassy carbon electrode. Electrochemical reduction of [SeCl 6 ] 2− resulted in deposition of Se on the electrode surface. The deposited Se was further reduced electrochemically at the more negative potential region to form [Se 2 ] 2− , which was suggested to exist by ultraviolet-visible spectroscopy. Se nanoparticles dispersed in the ionic liquid were formed by the proportionation reaction between [SeCl 6 ] 2− and [Se 2 ] 2− in the ionic liquid. The Se nanoparticles were characterized by energy dispersive X-ray spectroscopy and transmission electron microscopy.

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Stability of sputter-deposited gold nanoparticles in imidazolium ionic liquids

Cited by 62 publications

References 41 publications

Nanoparticles in ionic liquids: interactions and organization

Nanoparticles in ionic liquids: interactions and organization

Growth Behavior of Copper and Platinum Nanoparticles in an Imidazolium Based Ionic Liquid

Electrochemical Formation of Selenium Nanoparticle in an Amide-type Ionic Liquid

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