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Strain-Induced Self-Rolling of Electrochemically Deposited $Co(OH)_{2}$ Films into Organic–Inorganic Microscrolls
| Content Provider | MDPI |
|---|---|
| Author | Schwan, Jonas Rosenfeldt, Sabine Schenk, Anna S. |
| Copyright Year | 2022 |
| Description | Strain-induced self-folding is a ubiquitous phenomenon in biology, but is rarely seen in brittle geological or synthetic inorganic materials. We here apply this concept for the preparation of three-dimensional free-standing microscrolls of cobalt hydroxide. Electrodeposition in the presence of structure-directing water-soluble polyelectrolytes interfering with solid precipitation is used to generate thin polymer/inorganic hybrid films, which undergo self-rolling upon drying. Mechanistically, we propose that heterogeneities with respect to the nanostructural motifs along the surface normal direction lead to substantial internal strain. A non-uniform response to the release of water then results in a bending motion of the two-dimensional $Co(OH)_{2}$ layer accompanied by dewetting from the substrate. Pseudomorphic conversion into $Co_{3}O_{4}$ affords the possibility to generate hierarchically structured solids with inherent catalytic activity. Hence, we present an electrochemically controllable precipitation system, in which the biological concepts of organic matrix-directed mineralization and strain-induced self-rolling are combined and translated into a functional material. |
| Starting Page | 1072 |
| e-ISSN | 20734352 |
| DOI | 10.3390/cryst12081072 |
| Journal | Crystals |
| Issue Number | 8 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-31 |
| Access Restriction | Open |
| Subject Keyword | Crystals Electrocrystallization Cobalt Hydroxide Self-rolling Nanostructure Nanocomposites |
| Content Type | Text |
| Resource Type | Article |
