(1. 湖南大學(xué) 化學(xué)化工學(xué)院, 長沙 410082；
2. 湖南建材高等專科學(xué)校 化學(xué)化工系, 衡陽 421008)
摘 要: 用連續(xù)三脈沖（氧化、 成核和生長）電勢或電流在高定向石墨表面電沉積鈀合金納米線陣列。 研究了電沉積工藝對合成納米線的成分、尺寸及形貌的影響。 在含高濃度銨離子的鈀鎳和鈀銀氨配合物系統(tǒng)中合成鈀合金納米線陣列有利于鈀鎳和鈀銀合金的共沉積, 提高電沉積溶液的導(dǎo)電性能。控制電勢合成法能獲得成分均勻的納米線陣列, 但控制電流法能獲得線徑均勻的線條。 在-1.5~-1.4 V電勢下成核5~1 000 ms, 在-0.5~-0.25 V或-60~-20 μA/cm2下生長可得到成分均勻的鈀合金, 線條尺寸均勻、連續(xù)、 平行和分離的鎳含量為8%~15%的鈀鎳合金納米線和銀含量為16%~25%的鈀銀合金納米線陣列。
關(guān)鍵字: 鈀； 合金納米線； 高定向石墨； 電沉積
Pd-Ag alloy nanowire arrays
YUAN Juan1, WANG Jin-yin2
（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
