Spontaneous Formation of Microgroove Arrays on the Surface of p-Type Porous Silicon Induced by a Turing Instability in Electrochemical Dissolution

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Kazuhiro FukamiKuniaki Murase

Abstract

Self-organization plays an imperative role in recent materials science. Highly tunable, periodic structures based on dynamic self-organization at micrometer scales have proven difficult to design, but are desired for the further development of micropatterning. In the present study, we report a microgroove array that spontaneously forms on a p-type silicon surface during its electrodissolution. Our detailed experimental results suggest that the instability can be classified as Turing instability. The characteristic scale of the Turing-type pattern is small compared to self-organized patterns caused by the Turing instabilities reported so far. The mechanism for the miniaturization of self-organized patterns is strongly related to the semiconducting property of silicon electrodes as well as the dynamics of their surface chemistry.

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Citations

May 31, 2019·Physical Chemistry Chemical Physics : PCCP·Bianca T KitagakiRaphael Nagao

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