Abstract
AbstractIn this paper we report the pore formation onto n ‐InP (100) in acidic liquid ammonia at 223 K, by applying a constant current density of 2 mA·cm–2. The evolution of the electrode potential and the pore morphology has been investigated in this uncommon non‐aqueous medium. This solvent provides true water free and oxygen free conditions. Specific and reproducible electrochemical behaviour have been obtained. An original evolution of the porous structure has been observed by scanning electron microscopy. Tortuous current line oriented pores are formed. Pores are organized in hemispherical depressions and a multilayered structure is also evidenced. A three distinguished steps evolution has been established. In the first step, an insoluble passive layer is formed on surface, followed by the nucleation of the porous layer. The second phase corresponds to the formation of the first porous layer; while the third stage corresponds to the periodic lift‐off of the porous layer constituting thus a multilayered structure. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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