No abstract

This paper reports findings of an investigation of Pd-Ag alloy nanowires on the step edges of highly oriented pyrolytic graphite (HOPG) by electrochemical deposition at room temperature. Scanning electron microscopy (SEM) images reveal that these alloy nanowires (109-430 nm) are uniform in diameter, and have lengths up to 100-500 lm. The electrodeposition process involves the initial formation of nanowires induced at the step edges of the oxidized HOPG substrate at a very negative potential and subsequent growth at a constant low current density to coalesce the discontinuous nanowires. Alloy nanowires with a 20-25% silver content can be obtained when the ratio of Pd and Ag in the solution is carefully controlled. The SEM images demonstrate that the alloy nanowire arrays are continuous, parallel, ordered, well-aligned and have a narrow distribution of diameters. The Pd-Ag alloy nanowire arrays are promising materials for fabricating hydrogen nanosensors.

制脉冲电势-2.0 V 形核 0.2 s，在脉冲电势-0.4 V 生长 1h， 可以获得平均直径为 200nm, 长度约 400 滋m 的钯 镍合金纳米线阵列, 纳米线的合金成分中镍含量为 12.4%(质量分数, w).