(1. 湖南大学 化学化工学院, 长沙 410082；
2. 湖南建材高等专科学校 化学化工系, 衡阳 421008)
摘 要: 用连续三脉冲（氧化、 成核和生长）电势或电流在高定向石墨表面电沉积钯合金纳米线阵列。 研究了电沉积工艺对合成纳米线的成分、尺寸及形貌的影响。 在含高浓度铵离子的钯镍和钯银氨配合物系统中合成钯合金纳米线阵列有利于钯镍和钯银合金的共沉积, 提高电沉积溶液的导电性能。控制电势合成法能获得成分均匀的纳米线阵列, 但控制电流法能获得线径均匀的线条。 在-1.5~-1.4 V电势下成核5~1 000 ms, 在-0.5~-0.25 V或-60~-20 μA/cm2下生长可得到成分均匀的钯合金, 线条尺寸均匀、连续、 平行和分离的镍含量为8%~15%的钯镍合金纳米线和银含量为16%~25%的钯银合金纳米线阵列。
关键字: 钯； 合金纳米线； 高定向石墨； 电沉积
Pd-Ag alloy nanowire arrays
（1. College of Chemistry and Chemical Engineering,
Hunan University, Changsha 410082, China;
2. Department of Chemistry and Chemical Engineering,
Hunan College of Building Materials, Hengyang 421008, China）
Abstract: The palladium alloy nanowire arrays were electrodeposited on the surface of highly oriented pyrolytic graphite by successive three pulses of potential or current (oxidation, nucleation and growth). The effects of the deposition processes on the alloy compositions, sizes and morphologies of Pd alloy nanowire arrays were investigated. The palladium alloy nanowires synthesized in systems of Pd-Ni ammonia coordinates or Pd-Ag ammonia coordinates containing high ammonium ion concentration are apt to not only codeposite the Pd-Ni or Pd-Ag alloy, but also increase the conductibility of the plating solutions. The results show that the alloy nanowire arrays with even composition can be obtained by potentiostatic deposition, but those with narrow diameter distribution can be obtained by galvanostatic deposition. The parallel and separate palladium alloy nanowire arrays with equal composition and narrow diameters distribution with 8%-15% Ni or 16%-25% Ag can be obtained by nucleating at -1.5--1.4 V for 5-1 000 ms and growing at -0.5--0.25 V or -60--20 μA/cm2.
Key words: Pd; alloy nanowires; high oriented pyrolytic graphite; electrodeposition
