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2011 | "Hydrogen template assisted electrodeposition of sub-micrometer wires …

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작성자 관리자 /   작성일2015-08-25 /   조회1,035회

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Title : Hydrogen template assisted electrodeposition of sub-micrometer wires composing honeycomb-like porous Pb films
Authors: Serhiy Cherevko, Xiaoli Xing, and Chan-Hwa Chung

Journal : Applied Surface Science
Vol/No/Page : 257/18/8054-8061
DOI : 10.1016/j.apsusc.2011.04.098

Abstract :
High surface area porous Pb films are electrodeposited using a hydrogen bubble dynamic template. The influence of the experimental parameters on the morphology features such as the pore size, wall thickness, and sub-micrometer size features is investigated. Two structural transformations between sub-micrometer wires and particles obtained by adjusting the HClO(4) concentration are observed. At a low HClO(4) concentration, the growth of sub-micrometer wires is favored. The deposition of particles or wires covered by particles is observed at higher H(+) concentrations. The addition of sodium citrate as an additive facilitates the preservation of Pb in the form of wires. Adjusting the concentration of Pb(ClO(4))(2)center dot 3H(2)O influences the mass transfer of Pb and affects its morphology. At low concentrations, the deposition of porous Pb films composed of porous wires is shown. The additional deposition of particles on wires is observed at high concentrations. The formation process of honeycomb-like porous structures is revealed by analysis of films deposited during different deposition time. The influence of the current density on the micro and sub-micrometer scale morphologies is presented.

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