Formation of Au Nanofiber/Fullerene Nanowhisker 1D/1D Composites via Reductive Deposition at the Interface between an Ionic Liquid and Water

Koya, Ippei; Yokoyama, Y.; Sakka, Tetsuo; Nishi, Naoya

doi:10.1246/cl.220134

Cited by 4 publications

(5 citation statements)

References 32 publications

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“…Importantly, by lowering the pH of the aqueous phase, the thermodynamics of the reaction can be inhibited, favouring Au nanocluster formation (i.e., <1.7 nm in diameter particles). Moreover, the IL supramolecular fluidic microenvironment plays an important role in the size and shape of the particles formed, in agreement with previous works [7,9,29]. Unlike at the w|DCE micro-interface [15], large sub-micron (~500 nm diameter) particles were avoided at high pH.…”

Section: Discussionsupporting

confidence: 90%

“…Moreover, the liquid|liquid interface, or immiscible interface between two electrolyte solutions (ITIES), has become of increasing interest as a platform for the electrodeless synthesis of a variety of materials [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. While at first this relied on spontaneous chemical reactions, increasingly, electrochemical control via an applied external potential is being turned to.…”

Section: Introductionmentioning

confidence: 99%

“…In their propose anism, the RAIL partitions into the water phase and undergoes homogeneous transfer with H2PdCl4(aq). These previous reports have focused on the water|oil (w|o) interface; however, recently, the water|ionic liquid (w|IL) one has emerged [7][8][9][10]24,25]. Ionic liquids (ILs) are large-on a molecular scale-organic salts with melting points typically below ambient temperature whose molecular architecture can be tuned to obtain a wide variety of physicochemical properties.…”

Section: Introductionmentioning

confidence: 99%

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Electrodeless Synthesis of Low Dispersity Au Nanoparticles and Nanoclusters at an Immiscible Micro Water/Ionic Liquid Interface

Moshrefi

Stockmann

2022

Nanomaterials

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Owing to their biocompatibility, optical, and catalytic properties, Au nanoparticles (NPs) have been the subject of much research. Since smaller NPs have enhanced catalytic properties and NP morphology greatly impacts their effectiveness, controlled and reproducible methods of generating Au NPs are still being sought. Herein, Au NPs were electrochemically generated at a water|ionic liquid (w|IL) immiscible micro-interface, 25 µm in diameter, using a redox active IL and compared to results at a water|oil (w|o) one. The liquid|liquid interface is advantageous as it is pristine and highly reproducible, as well as an excellent means of species and charge separation. In this system, KAuCl4 dissolved in the aqueous phase reacts under external potential control at the water|P8888TB (tetraoctylphosphonium tetrakis(pentafluorophenyl)borate) with trioctyl(ferrocenylhexanoyl)phosphonium tetrakis(pentafluorophenyl)borate (FcIL), an electron donor and redox active IL. FcIL was prepared with a common anion to P8888TB, which greatly enhances its solubility in the bulk IL. Simple ion transfer of AuCl4− and AuCl(4−γ)(OH)γ− at the w|P8888TB micro-interface were characterized voltammetrically as well as their heterogeneous electron transfer reaction with FcIL. This interfacial reaction generates Au NPs whose size can be thermodynamically controlled by modifying the pH of the aqueous phase. Critically, at low pH, nanoclusters, <1.7 nm in diameter, were generated owing to inhibited thermodynamics in combination with the supramolecular fluidic nature of the IL microenvironment that was observed surrounding the as-prepared NPs.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrodeless Synthesis of Low Dispersity Au Nanoparticles and Nanoclusters at an Immiscible Micro Water/Ionic Liquid Interface

Moshrefi

Stockmann

2022

Nanomaterials

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“…Fullerenes are composed of a single element, carbon, and have a simple zero-dimensional shape. Nevertheless, by simply changing the conditions, one-dimensional [ 408 , 409 ], two-dimensional [ 410 , 411 ], three-dimensional [ 412 , 413 ], and hierarchical structures [ 414 ] can be obtained. Those structures can also be treated at high temperatures to synthesize various forms of carbon materials.…”

Section: Fullerene Assembly: Examples Of Dynamic Formation Process Fr...mentioning

confidence: 99%

Materials Nanoarchitectonics at Dynamic Interfaces: Structure Formation and Functional Manipulation

Ariga

2024

Materials

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The next step in nanotechnology is to establish a methodology to assemble new functional materials based on the knowledge of nanotechnology. This task is undertaken by nanoarchitectonics. In nanoarchitectonics, we architect functional material systems from nanounits such as atoms, molecules, and nanomaterials. In terms of the hierarchy of the structure and the harmonization of the function, the material created by nanoarchitectonics has similar characteristics to the organization of the functional structure in biosystems. Looking at actual biofunctional systems, dynamic properties and interfacial environments are key. In other words, nanoarchitectonics at dynamic interfaces is important for the production of bio-like highly functional materials systems. In this review paper, nanoarchitectonics at dynamic interfaces will be discussed, looking at recent typical examples. In particular, the basic topics of “molecular manipulation, arrangement, and assembly” and “material production” will be discussed in the first two sections. Then, in the following section, “fullerene assembly: from zero-dimensional unit to advanced materials”, we will discuss how various functional structures can be created from the very basic nanounit, the fullerene. The above examples demonstrate the versatile possibilities of architectonics at dynamic interfaces. In the last section, these tendencies will be summarized, and future directions will be discussed.

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“…This methodology is also substrate-free; therefore, the formed nanostructures are easily separated from the reaction liquids and washed for purification. The liquid-liquid two-phase system for metal nanostructure formation is not limited to the O-W system; it has been extended to the ionic liquid (IL)-W twophase system by our group [8,9,18,[10][11][12][13][14][15][16][17] and other groups, [19][20][21][22][23] where a variety of metal nanostructure morphologies were attained.…”

Section: Introductionmentioning

confidence: 99%

A Water‐Free ITIES: Ionic Liquid/Oil Interface for Base Metal Nanostructure Formation – Zn Case

et al. 2022

Self Cite

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Reductive metal deposition at the interface between two immiscible electrolyte solutions (ITIES), the oil/water interface, is an attractive methodology to produce metal nanostructures. However, the metals that can be deposited are limited to noble metals; otherwise, water molecules are reduced. Herein, a method to overcome this limitation by utilizing a novel waterfree ITIES between a hydrophilic ionic liquid and oil was introduced. As proof-of-concept experiments, the reductive deposition of zinc, a base metal with a standard redox potential more negative than that of water, was successfully realized at the ionic liquid/oil interface. The morphology of the zinc nanostructures was investigated, and the reaction mechanism was discussed, in which the electron transfer and ion transfer reactions across the interface simultaneously occurred to maintain the electroneutrality of the liquids.

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Formation of Au Nanofiber/Fullerene Nanowhisker 1D/1D Composites via Reductive Deposition at the Interface between an Ionic Liquid and Water

Cited by 4 publications

References 32 publications

Electrodeless Synthesis of Low Dispersity Au Nanoparticles and Nanoclusters at an Immiscible Micro Water/Ionic Liquid Interface

Electrodeless Synthesis of Low Dispersity Au Nanoparticles and Nanoclusters at an Immiscible Micro Water/Ionic Liquid Interface

Materials Nanoarchitectonics at Dynamic Interfaces: Structure Formation and Functional Manipulation

A Water‐Free ITIES: Ionic Liquid/Oil Interface for Base Metal Nanostructure Formation – Zn Case

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