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Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
In-situ Electrochemical Atomic Force Microscopy with Atomic Resolution of Ni(110) in Neutral and Alkaline Aqueous Solution
Nobumitsu HiraiHiromi OkadaShigeta Hara
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2003 Volume 44 Issue 4 Pages 727-730

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Abstract

Bare and anodically oxidized Ni(110) surfaces in 0.05 kmol m−3 Na2SO4 (pH = 6.5) and 0.01 kmol m−3 NaOH (pH = 12) aqueous solution have been investigated by in-situ electrochemical atomic force microscopy (EC-AFM) with atomic resolution. We have succeeded in in-situ observation of unreconstructed Ni(110)-(1×1) structures in both 0.05 kmol m−3 Na2SO4 and 0.01 kmol m−3 NaOH solution. Under passive region, we have observed well-ordered structures differing from those of the bare surfaces and we found that surface structure of anodically oxidized Ni(110) in 0.05 kmol m−3 Na2SO4 solution agrees with NiO(110), whereas that in 0.01 kmol m−3 NaOH solution agrees with β-Ni(OH)2 (0001). These EC-AFM observations reveal the following orientation relationship of the surface structures on the anodic oxide layers and the substrates: NiO(110) [001] || Ni(110) [001] and NiO(110) [1\\bar10] || Ni(110) [1\\bar10] in neutral solution, and β-Ni(OH)2(0001) [11\\bar20] || Ni(110) [001] and β-Ni(OH)2(0001) [1\\bar100] || Ni(110) [1\\bar10] in alkaline solution.

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© 2003 The Japan Institute of Metals and Materials
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