Formation of Cu-Sn Alloy Layer by Contact Deposition Using Quaternary Ammonium-Imide-Type Ionic Liquid

Katase, Takuma; Kurosaki, Ryoichi; Murase, Kuniaki; Hirato, Tetsuji; Awakura, Yasuhiro

doi:10.1149/1.2171814

Cited by 27 publications

(32 citation statements)

References 9 publications

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“…Although ionic liquids are sometimes termed ''room-temperature molten salts,'' we should not adhere to the use of ionic liquids at room temperatures. We have recently been investigating the electrochemical alloying of a Cu-Sn layer at middle to low temperatures, 120-150°C, using TMHA-Tf 2 N as electrolyte [17]. At elevated temperatures, the advantages of ionic liquids, i.e.…”

Section: Diffusion Of Cu(i) Ions In Tmha-tf 2 N Ionic Liquidmentioning

confidence: 99%

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Redox and transport behaviors of Cu(I) ions in TMHA-Tf2N ionic liquid solution

et al. 2007

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The redox and transport behavior of monovalent copper species in an ammonium imide-type ionic liquid, trimethyln-hexylammonium bis((trifluoromethyl)sulfonyl)amide (TMHA-Tf 2 N) were examined with a micro-disc electrode to clarify its applicability to, for example, electroplating. It was found that the diffusion coefficient of Cu(I) ions in TMHA-Tf 2 N containing 12 mmol dm )3 Cu(I) ions was 1.2 Â 10 )6 cm 2 s )1 and the redox potential of Cu(I)/Cu was in the potential range 0.1-0.2 V vs. I ) /I 3 ) at 50°C. The diffusion coefficient was one order smaller than that of Cu(II) ions in aqueous solution due to the high viscosity of the ionic liquid. The diffusion coefficient of Cu(I) ion increased with rising temperature and was 1.0 Â 10 )5 cm 2 s )1 at 112°C, which was comparable to that of Cu(II) ions in aqueous CuSO 4 solutions at ambient temperature. This is accounted for by the drastic decrease in the viscosity of the ionic liquid solution with increasing temperature. The activation energy of diffusion was estimated to be 39 kJ mol )1 in the ionic liquid solution.

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Section: Diffusion Of Cu(i) Ions In Tmha-tf 2 N Ionic Liquidmentioning

confidence: 99%

“…In addition, ionic liquids can also be used as a solvent for electrodeposition processes at medium-low temperatures, i.e. 100-200°C, that cannot easily be attained with aqueous or volatile organic baths [17].…”

Section: Introductionmentioning

confidence: 99%

Redox and transport behaviors of Cu(I) ions in TMHA-Tf2N ionic liquid solution

et al. 2007

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“…We thus focused on ionic liquids (ILs), which are currently the subject of considerable attention as a new ''green" electrolyte for electrochemical science and engineering [13][14][15]. Most ILs have a wider potential window (up to $5 V) and a higher thermal stability (up to 450°C) [16,17], so the use of ILs would maximize the performance of electrochemically active SAMs and contribute to their long-term stability when applied to some electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Anionic effect of ionic liquids electrolyte on electrochemical behavior of ferrocenylthiol/alkanethiol binary SAMs

Sun

Murase

Ichii

et al. 2010

Journal of Electroanalytical Chemistry

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a b s t r a c tRedox behaviors of binary self-assembled monolayers (SAMs) consisting of ferrocenyl-and methyl-terminated alkanethiols on gold were investigated in three different ionic liquids (ILs) and were compared with the behaviors in an aqueous HClO 4 solution. A set of cyclic voltammograms showed that, when the surface density of ferrocenyl-groups was relatively high, the shape of redox waves (e.g. peak area and peak broadening towards positive potential) for the ferrocenyl-groups was strongly affected by the anion size of the ILs, suggesting that the compensation of surface positive charge emerged when oxidized to ferrocenium state is sterically-hindered in the case of large anions like bis[(trifluoromethyl)sulfonyl]amide (TFSA À ). This is supported by the fact that the anion-size effect disappeared if the density of ferrocenyl-groups was diluted. A potential-step chronocoulometry was concomitantly employed to estimate the net faradaic charge of the redox. The redox behaviors in mixed ILs containing two different sized anions also gave clear evidence that smaller anions, e.g. BF À 4 ions, have a greater tendency to make ion pairs with ferrocenium moieties.

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“…Especially, the treatment of the alloy deposition bath, the entropy of which is high since the bath contains two or more metal components, is energy-consuming in some cases. Recently, Murase and coworkers investigated the formation of Cu-Sn speculum alloy layers through a reduction-diffusion method using a galvanic contact [1] or potentiostatic alloying [2] of Cu substrate. Here, they demonstrated that the alloy layers can easily be prepared through successive electrochemical processes using two baths, each containing a single metal ions, i.e.…”

Section: Introductionmentioning

confidence: 99%