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Giant electrochemical actuation in a nanoporous silicon-polypyrrole hybrid material
Citation Link: https://doi.org/10.15480/882.3001
Publikationstyp
Journal Article
Date Issued
2020-09-30
Sprache
English
TORE-DOI
TORE-URI
Journal
Volume
6
Issue
40
Article Number
eaba1483
Citation
Science Advances 40 (6): eaba1483 (2020)
Publisher DOI
Scopus ID
PubMed ID
32998892
Publisher
American Association for the Advancement of Science
The absence of piezoelectricity in silicon makes direct electro-mechanical applications of this mainstream semiconductor impossible. Integrated electrical control of the silicon mechanics, however, would open up new perspectives for on-chip actuorics. Here, we combine wafer-scale nanoporosity in single-crystalline silicon with polymerization of an artificial muscle material inside pore space to synthesize a composite that shows macroscopic electrostrain in aqueous electrolyte. The voltage-strain coupling is 3 orders of magnitude larger than the best-performing ceramics in terms of piezoelectric actuation. We trace this huge electroactuation to the concerted action of 100 billions of nanopores per square centimetre cross-section and to potential-dependent pressures of up to 150 atmospheres at the single-pore scale. The exceptionally small operation voltages (0.4-0.9 V) along with the sustainable and biocompatible base materials make this hybrid promising for bio-actuator applications.
Subjects
Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Materials Science
Physics - Soft Condensed Matter
physics.app-ph
Physics - Chemical Physics
DDC Class
530: Physik
540: Chemie
Funding(s)
Publication version
publishedVersion
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