Macroscopically uniform nanoperiod alloy multilayers formed by coupling of electrodeposition with current oscillations.
Macroscopically uniform nanoperiod alloy multilayers formed by coupling of electrodeposition with current oscillations.
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DOI：
10.1021/jp045876x
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发表时间：
2005-01
期刊：
影响因子：
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通讯作者：
Shuji Nakanishi;Sho-ichiro Sakai;T. Nagai;Y. Nakato
中科院分区：
文献类型：
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作者：
Shuji Nakanishi;Sho-ichiro Sakai;T. Nagai;Y. Nakato
在含有Cu（2+）、Sn（2+）和阳离子表面活性剂的酸性溶液中，电沉积产生负的微分电阻（NDR），并在约20 mV的窄电位区域产生电流振荡，比Sn-Cu合金沉积的起始电位略负。扫描俄歇显微检查表明，振荡过程中沉积的合金膜具有明显的由两种不同成分的合金层组成的交替多层结构。多层膜的厚度周期为40-90 nm，在约1 mm x 1 mm的宏观宽区域内均匀。详细的研究表明，NDR是由阳离子表面活性剂（作为金属离子扩散的抑制剂）在合金表面的吸附引起的，振荡是由NDR与电解质中的欧姆降耦合引起的。
The electrodeposition from an acidic solution containing Cu(2+), Sn(2+), and a cationic surfactant gave a negative differential resistance (NDR) and a current oscillation in a narrow potential region of about 20 mV lying slightly more negative than the onset potential for Sn-Cu alloy deposition. Scanning Auger microscopic inspection has indicated that alloy films deposited during the oscillation have a clear alternate multilayer structure composed of two alloy layers of different compositions. The multilayer had the period of thickness of 40-90 nm and was uniform over a macroscopically wide area of about 1 mm x 1 mm. Detailed investigations have revealed that the NDR arises from adsorption of a cationic surfactant (acting as an inhibitor for diffusion of metal ions) on the alloy surface, and the oscillation comes from coupling of the NDR with the ohmic drop in the electrolyte.