Please use this identifier to cite or link to this item: doi:10.22028/D291-33147
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Title: A MACEing silicon: Towards single-step etching of defined porous nanostructures for biomedicine
Author(s): Alhmoud, Hashim
Brodoceanu, Daniel
Elnathan, Roey
Kraus, Tobias
Voelcker, Nicolas H.
Language: English
Title: Progress in materials science
Volume: 116
Publisher/Platform: Elsevier
Year of Publication: 2021
Publikation type: Journal Article
Abstract: Metal-assisted chemical etching (MACE) affords porous silicon nanostructures control over size, shape, and porosity in a single step. Simplicity and flexibility are potential advantages over more traditional silicon bulk micromachining techniques. MACE-generated porous micro- and nanostructures are suitable as biomaterials through their length scales and biocompatibility. This work provides a comprehensive overview of the MACE reaction mechanism that yields biomedically relevant silicon nanostructures – from nanowires, nanopillars, to sub-micrometer holes and pores. We discuss their biomedical applications in biosensors, cell capture and transfection arrays, and drug delivery vectors. We assess the reported benefits of the various nanostructures and discuss whether MACE provides clear and distinct advantages over other techniques. The flexibility and simplicity of MACE comes at a cost. The reaction parameters are many and inter-related, and we lack a full model of the etching mechanism. While the cathode reaction is well understood, the anode reaction involving dissolution of the silicon remains controversial. Such uncertainties impede rational design of specific structures that address biomedical requirements. We summarize current understanding to provide design guidelines for structures used in biomedicine and review the effects of key parameters on the morphological attributes of the etched features.
DOI of the first publication: 10.1016/j.pmatsci.2019.100636
URL of the first publication: https://www.sciencedirect.com/science/article/abs/pii/S0079642519301185
Link to this record: hdl:20.500.11880/30466
http://dx.doi.org/10.22028/D291-33147
ISSN: 1873-2208
0048-5500
Date of registration: 27-Jan-2021
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
Professorship: NT - Prof. Dr. Tobias Kraus
Collections:Die Universitätsbibliographie

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