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电化学(中英文) ›› 1996, Vol. 2 ›› Issue (2): 164-169. 

• 研究论文 • 上一篇    下一篇

铜在HOPG上电沉积过程的现场ECSTM研究

谢兆雄,毛秉伟,卓向东,穆纪,千田昭武   

  1. 厦门大学化学系
  • 收稿日期:1996-05-28 修回日期:1996-05-28 出版日期:1996-05-28 发布日期:1996-05-28

In Situ Studies of Copper Electrodepostion on HOPG by Using ECSTM

Xie Zhaoxiong Mao Bingwei Zhuo Xiangdong Mu Jiqian Tian Zhaowu   

  1. (State Key Laboratory for Physical Chemistry of the Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:1996-05-28 Revised:1996-05-28 Published:1996-05-28 Online:1996-05-28

摘要: 用自制的电化学扫描隧道显微镜(ECSTM)现场研究Cu在HOPG上的电沉积过程.结果表明Cu在HOPG上的电沉积为三维成核的过程.当电位较低或Cu2+离子浓度较低时,铜在本体金属生长主要沿着台阶方向.过电位较高时,铜的成核数目增加,沉积层的晶粒有所细化.同时,非现场ECSTM比较研究表明,STM针尖对针尖局部区域的电沉积起屏蔽作用,针尖所在区域Cu的沉积速度比其它区域明显减小

关键词: ECSTM, STM, 电沉积, 铜沉积层

Abstract: In this paper, copper electrodepostion on HOPG had been in situ studied by using a homebuilt electrochemical scanning tunneling microscopy (ECSTM). Three dimensional nucleation and subsequent growth of copper crystals were found as the initial stage of copper deposition on HOPG. In the case of lower overpotential or lower concentration of Cu 2+ , the bulk deposited copper layer tended to form smooth terraces, and grow at the edge of steps. The terraces were stable to some extent, which made it possible to be observed with atomic resolution. At a higher overpotential, the crystal size of copper were somehow smaller. By comparing with ex situ STM images, it was found that the deposition rate under the STM tip area was much lower, which might due to the shielding of the STM tip.

Key words: ECSTM, STM, Electrodeposition, Copper deposits

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