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https://doi.org/10.15480/882.3660
Publisher DOI: | 10.1038/s41467-021-23398-0 | Title: | Laser-excited elastic guided waves reveal the complex mechanics of nanoporous silicon | Language: | English | Authors: | Thelen, Marc ![]() Bochud, Nicolas Brinker, Manuel ![]() Prada, Claire Huber, Patrick ![]() |
Issue Date: | 14-Jun-2021 | Publisher: | Nature Publishing Group UK | Source: | Nature Communications 12 (1): 3597 (2021-12-01) | Abstract (english): | Nanoporosity in silicon leads to completely new functionalities of this mainstream semiconductor. A difficult to assess mechanics has however significantly limited its application in fields ranging from nanofluidics and biosensorics to drug delivery, energy storage and photonics. Here, we present a study on laser-excited elastic guided waves detected contactless and non-destructively in dry and liquid-infused single-crystalline porous silicon. These experiments reveal that the self-organised formation of 100 billions of parallel nanopores per square centimetre cross section results in a nearly isotropic elasticity perpendicular to the pore axes and an 80% effective stiffness reduction, altogether leading to significant deviations from the cubic anisotropy observed in bulk silicon. Our thorough assessment of the wafer-scale mechanics of nanoporous silicon provides the base for predictive applications in robust on-chip devices and evidences that recent breakthroughs in laser ultrasonics open up entirely new frontiers for in-situ, non-destructive mechanical characterisation of dry and liquid-functionalised porous materials. |
URI: | http://hdl.handle.net/11420/9896 | DOI: | 10.15480/882.3660 | ISSN: | 2041-1723 | Journal: | Nature communications | Institute: | Material- und Röntgenphysik M-2 | Document Type: | Article | Project: | SFB 986: Teilprojekt B7 - Polymere in grenzflächenbestimmten Geometrien: Struktur, Dynamik und Funktion an planaren und in porösen Hybridsystemen Dynamische Elektrobenetzung an Nanoporösen Oberflächen: Schaltbare Tropfenspreitung, Imbition und Elastokapillarität Publikationsfonds 2021 |
Funded by: | Deutsche Forschungsgemeinschaft (DFG) | More Funding information: | C.P. acknowledges the support of LABEX WIFI (within the French Program "Investments for the Future”) under references ANR-10-LABX-24 and ANR-10-IDEX-0001-02 PSL*. N.B. acknowledges the Univ Paris-Est Creteil for the "Support for research for newly appointed Associate Professors”. | License: | ![]() |
References: | 10.15480/336.3174 |
Appears in Collections: | Publications with fulltext |
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s41467-021-23398-0.pdf | Verlags-PDF | 2,1 MB | Adobe PDF | View/Open![]() |
s41467-021-24354-8.pdf | Verlags-Korrektur | 330,9 kB | Adobe PDF | View/Open![]() |
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