表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
70 巻 , 4 号
選択された号の論文の2件中1~2を表示しています
研究論文
  • 北田 敦, 姜 唯宇, 深見 一弘, 邑瀬 邦明
    2019 年 70 巻 4 号 p. 210-214
    発行日: 2019/04/01
    公開日: 2019/04/04
    ジャーナル フリー

    For use in room-temperature electrodeposition of magnesium(Mg)metal, aging variation was studied to assess the electrochemical properties of a mixed system: an ionic liquid(IL)and a Grignard reagent. Cyclic voltammograms of a mixture of an IL, i.e. trimethylhexylammonium bis(trifluoromethylsulfonyl)amide(TMHA-Tf2N; Tf=CF3SO2), and a Grignard reagent, i.e., ethylmagnesium bromide(EtMgBr)in tetrahydrofuran(THF), showed redox currents for Mg metal deposition and dissolution. Similarly to other IL-Grignard mixed electrolyte solutions, the mixture examined in this study was found to have larger redox current than neat Grignard electrolyte solutions. Voltammograms for one-day-aged TMHA-Tf2N-EtMgBr-in-THF mixtures showed smaller or almost no redox current. Furthermore, adding a Grignard reagent to the one-day-aged IL-Grignard mixture did not improve the electrochemical properties. Therefore, redox property deterioration was not attributable to a sizable decrease in the electrochemically active species or a shift of the Schlenk equilibrium in 2EtMgBr ↔ Et2Mg+MgBr2. From our results, we speculate that Lewis acidic IL cations and Lewis basic Grignard species reacted gradually to form redox-inactive species or inhibitor(s)for the electrochemical deposition of Mg.

  • 星 芳直, 相場 玲宏, 藤井 尚人, 四反田 功, 板垣 昌幸
    2019 年 70 巻 4 号 p. 215-219
    発行日: 2019/04/01
    公開日: 2019/04/04
    ジャーナル フリー

    An impedance-response-based copper wiring corrosion sensor(CCS)was fabricated using screen printing technique. Filter paper(FP)containing 1 M NaCl solution was set on the zigzag conducting parts of the CCS to control the wet area during impedance measurements using a two-electrode system. Arbitrary values of width w or length L of the FP were chosen to investigate the short circuit current in the direction along or crossing the conducting parts. Impedance spectra with different w values of the FP showed a loop on the Nyquist plane. Loop diameter d increased concomitantly with increasing w values of the FP. Part of the loop was observed in the impedance spectra with different L values of the FP. Values of d estimated from respective parts of the loop increased concomitantly with increasing L values of the FP. Results indicate that these loops are related to the copper-wiring / electrolyte solution interface and that d values increase concomitantly with increasing wet area on the conducting parts. Results of the electrochemical impedance simulation demonstrated the following: solution resistance Rsol is inversely related to the L values; the electric double layer capacitance Cdl increased linearly, concomitantly with increasing L values of the FP; and Rsol and the Cdl increased linearly, concomitantly with increasing w values of the FP. Results demonstrate that the impedance response is related closely to the short circuit current in the direction crossing the conducting parts of the CCS.

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