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Kinked silicon nanowires: Superstructures by metal assisted chemical etching

Sandu, Georgiana, Avila Osses, Jonathan, Luciano, Marine, Caina, Darwin, Stopin, Antoine, Bonifazi, Davide, Gohy, Jean-François, Silhanek, Alejandro V., Florea, Ileana, Bahri, Mounib, Ersen, Ovidiu, Leclere, Philippe, Gabriele, Sylvain, Vlad, Alexandru and Melinte, Sorin 2019. Kinked silicon nanowires: Superstructures by metal assisted chemical etching. Nano Letters , -. 10.1021/acs.nanolett.9b02568

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We report on metal assisted chemical etching of Si for the synthesis of mechanically-stable, hybrid crystallographic orientation Si superstructures with high aspect ratio, above 200. This one-pot-type method sustains high etching rates and facilitates reproducible results. The protocol enables the control of the number, angle and location of kinks via successive etch-quench sequences. We analysed relevant Au mask catalyst features to systematically assess their impact on a wide spectrum of etched morphologies that can be easily attained and customized by fine tuning of the critical etching parameters. For instance, the designed kinked Si nanowires can be internalized in biological cells, without affecting their viability. An accessible numerical model is provided to explain the etch profiles and the physico-chemical events at the Si-Au-electrolyte interface and offers guidelines for the development of finite-element modeling of metal assisted Si chemical etching.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Chemistry
Publisher: American Chemical Society
ISSN: 1530-6984
Date of First Compliant Deposit: 14 October 2019
Date of Acceptance: 8 October 2019
Last Modified: 19 Jan 2021 03:30

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