Selective Growth of Ag Nanowires on Si(111) Surfaces by Electroless Deposition

Tokuda, Norio; Sasaki, Naoyuki; Watanabe, Hidenobu; Miki, Kazushi; Yamasaki, Satoshi; Hasunuma, Ryu; Yamabe, Kikuo

doi:10.1021/jp052284l

Cited by 12 publications

(11 citation statements)

References 12 publications

(24 reference statements)

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“…4,5 Liquid−liquid phase separation of organic salts (ionic liquids) mixing with small organic molecules is also of great importance, especially in catalysis 6,7 and separation. 8,9 For instance, the biocatalytic synthesis of 16 flavor esters 10 or monoacylglycerides 11 can be carried out in specific ionic liquids and separated through liquid−liquid phase separation. Similar procedures were also found when mixing ionic liquids with other small organic molecules such as neryl acetate 12 and immobilized lipase.…”

Section: Introductionmentioning

confidence: 99%

“…Liquid–liquid phase separation is of great importance in many fields of chemistry, chemical engineering, biology, physics, and materials science. For instance, liquid–liquid phase separation can be used for membrane preparation, , liquid catalysis, and providing separated environment for complex bio–chemical interactions in cell. , Liquid–liquid phase separation of organic salts (ionic liquids) mixing with small organic molecules is also of great importance, especially in catalysis , and separation. , For instance, the biocatalytic synthesis of 16 flavor esters or monoacylglycerides can be carried out in specific ionic liquids and separated through liquid–liquid phase separation. Similar procedures were also found when mixing ionic liquids with other small organic molecules such as neryl acetate and immobilized lipase .…”

Section: Introductionmentioning

confidence: 99%

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Liquid–Liquid Phase Separation of Viologen Bistriflimide/Benzene Mixtures: Role of the Dual Ionic and Organic Nature of Ionic Liquids

et al. 2020

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Liquid–liquid phase separation occurs at room temperature when mixing an excess of benzene with solid viologen bistriflimide salts with various alkyl side-chain lengths. A liquid phase composed of (almost) pure benzene is above the other sponge-like liquid phase with salt absorbed in benzene. Nuclear magnetic resonance experiments indicate that the mole ratio of benzene/salt in the sponge-like phase remains unchanged upon varying the amounts of (nonexcessive) salt or benzene. Moreover, the benzene/viologen salt mole ratio in the sponge-like phase increases linearly with respect to the side-chain length of the cation. Similarly, when an excess of viologen salt is added in benzene, a sponge-like liquid phase composed of salt absorbed by benzene is observed in equilibrium with some solid viologen salt neither dissolved nor absorbed by the solvent. The mole ratio of the sponge-like liquid phase again increases linearly with side-chain length, while it remains independent of the relative amount of benzene and viologen salt as long as the latter is in excess. Finally, when appropriate amounts of benzene and viologen salt are mixed, a single sponge-like liquid phase is observed at an intermediate composition between the lower and upper limits. Molecular dynamics simulations reveal that because of their dual ionic and organic nature, when absorbed in benzene, the studied salts form nanoscale segregated liquid structures, akin ionic liquids, with a continuous polar network composed of anions and cationic charged groups, along with nonpolar domains composed of alkyl cationic side chains. Benzene molecules are preferentially absorbed inside the nonpolar region, which effectively expands the nonpolar region to be sponge-like and consequently liquidizes the viologen salt. The linearity of the benzene/salt ratio in the upper and lower phase boundaries comes from the fact that the effective volume of the nonpolar region for accommodating benzene molecules grows linearly with cationic alkyl side-chain length. The occurrence of the above phenomena is attributed to the nonpolar feature of benzene molecules, and there is no evidence of π–π or ion−π interaction between the ions and benzene molecules. Moreover, the diffusion of benzene in the sponge-like phase is found to be close to that in n-alkanes, supporting the idea of nanoscale segregation of polar and nonpolar regions in the sponge-like phase. The revealed mechanism is anticipated to be general for understanding liquid–liquid phase separation observed in mixtures of organic salts (ionic liquids) having relatively long alkyl chains with small organic molecules.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Phase Separation of Viologen Bistriflimide/Benzene Mixtures: Role of the Dual Ionic and Organic Nature of Ionic Liquids

et al. 2020

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“…[2][3][4] We have reported that atomic metal wires could be fabricated along step edges by the wet process. [5][6][7] To obtain well-controlled nanostructures, however, some advanced methods of template preparation with a given step structure are required. It is thus necessary to understand wet etching kinetics during step-terrace preparation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Kink Generation Rate and Step Flow Velocity on Si(111) during Wet Etching

Hasunuma

Yamabe

2013

Jpn. J. Appl. Phys.

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The rate of kink generation in ultralow dissolved-oxygen water (LOW) at a <112̄> oriented atomic step on a Si(111) surface was experimentally determined. By controlling the step length by adding SiO2 line patterns that prevent kink propagation across the patterns, it was found that step flow velocity was proportional to step length when the step was short. From the proportionality coefficient, the rate of kink generation was evaluated to be 800 cm-1 s-1. Furthermore, the velocity of kink propagation along a step was also evaluated as 40 nm/s.

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“…On the other hand, a promising approach to exploiting the SERS effect of the 2D Au nanoplates involves integrating them with a solid substrate. As a result of this need, extensive exploration has been undertaken in recent years; however, most of the employed methods are restricted by a two‐step route (synthesizing Au nanoplates first and then casting them on the surface of a solid substrate). Alternatively, simultaneous synthesis and immobilization of Au nanoplates on the selected matrix has been attractive because of great convenience and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Au nanoplate/polypyrrole nanofiber composite film: preparation, characterization and application as SERS substrate

Xia

Xiao

2011

J Raman Spectroscopy

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Without any other additives or additional energy, Au nanoplates have been successfully prepared and integrated simultaneously with the dedoped polypyrrole nanofiber film via the in situ reduction of AuCl4– on the film surface. The morphology and structure of the as‐prepared composite film are characterized, and its application for surface‐enhanced Raman scattering is also investigated. It has been found that the morphology of as‐prepared Au nanoplates is dependent on the reaction duration, while the density is dependent on the concentration of AuCl4– ions in the reaction process. It is suggested that polypyrrole plays dual reducing and structure‐directing roles during the formation of Au nanoplates. Surface‐enhanced Raman scattering study shows that the Au nanoplates give an intensive and enhanced Raman scattering when 4‐aminothiophenol is used as a probing molecule. The employed approach may shed some light on simultaneously fabricating and immobilizing other noble metal micro/nanostructures with unique morphology. Copyright © 2011 John Wiley & Sons, Ltd.

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Selective Growth of Ag Nanowires on Si(111) Surfaces by Electroless Deposition

Cited by 12 publications

References 12 publications

Liquid–Liquid Phase Separation of Viologen Bistriflimide/Benzene Mixtures: Role of the Dual Ionic and Organic Nature of Ionic Liquids

Liquid–Liquid Phase Separation of Viologen Bistriflimide/Benzene Mixtures: Role of the Dual Ionic and Organic Nature of Ionic Liquids

Evaluation of Kink Generation Rate and Step Flow Velocity on Si(111) during Wet Etching

Au nanoplate/polypyrrole nanofiber composite film: preparation, characterization and application as SERS substrate

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