期刊
SCIENCE ADVANCES
卷 3, 期 9, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1701483
关键词
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资金
- Investissements d'Avenir LabEx PALM [ANR-10 LABX-0039-PALM]
- European Union's Horizon research and innovation program under the Marie Sklodowska-Curie grant [661199]
- CNRS-Commissariat a l'Energie Atomique et aux Energies Alternatives METSA French network [FR CNRS 3507]
- European Union [312483-ESTEEM2]
- Marie Curie Actions (MSCA) [661199] Funding Source: Marie Curie Actions (MSCA)
The emergence of chirality is a central issue in chemistry, materials science, and biology. In nanoparticle assemblies, chirality has been shown to arise through a few different processes, but chiral organizations composed of plate-like nanoparticles, a class of material under scrutiny due to their wide applicative potential, have not yet been reported. We show that ribbons of stacked board-shaped cadmium selenide (CdSe) nanoplatelets (NPLs) twist upon the addition of oleic acid ligand, leading to chiral ribbons that reach several micrometers in length and display a well-defined pitch of similar to 400 nm. We demonstrate that the chirality originates from surface strain caused by the ligand because isolated NPLs in dilute solution undergo a transition from a flat to a twisted shape as the ligand coverage increases. When the platelets are closely stacked within ribbons, the individual twist propagates over the whole ribbon length. These results show that a ligand-induced mechanical stress can strongly distort thin NPLs and that this stress can be expressed at a larger scale, paving the way to stress engineering in assemblies of nanocrystals. Such a structural change resulting from a simple external stimulus could have broad implications for the design of sensors and other responsive materials.
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