Details
| Original language | English |
|---|---|
| Article number | 2009104 |
| Journal | Advanced functional materials |
| Volume | 31 |
| Issue number | 8 |
| Early online date | 18 Dec 2020 |
| Publication status | Published - 17 Feb 2021 |
Abstract
The central promise of nanoparticle-based materials is that cooperative properties may emerge, when individual quantum dots are positioned on a periodic lattice. Yet, there are only a few papers in the literature reporting such effects. Nevertheless, it is clear that the symmetry of the superlattice is decisive for the desired emergent phenomena. An interesting question is, how the symmetry of the initial monodisperse nanoparticles affects the structure of the colloidal crystal during self-assembly processes. For instance, particles with a hexagonal cross-section demonstrate self-organization, which is very similar to spherical colloids. Likewise, one would also expect that trigonal nanoparticles behave similarly. Unfortunately, it is very hard to obtain monodisperse semiconductor colloids with a trigonal shape, because this requires a symmetry break during morphogenesis of the nanocrystal. While such a symmetry break is known in the literature for structures attached to a solid substrate, herein, colloidal synthesis of trigonal ZnO nanorods is successfully demonstrated, and the mechanism is elucidated via experimental and theoretical methods. 2D-superlattices formed by such particles with trigonal cross-section are compared to hexagonal analogues. It is found that there are distinct differences, which result in important differences in properties such as the formation of voids and also in optical properties.
Keywords
- colloidal superstructures, nanoparticle shape, nanorods, particle-based materials, self-assembly
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Advanced functional materials, Vol. 31, No. 8, 2009104, 17.02.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ligand-Programmed Consecutive Symmetry Break(s) in Nanoparticle Based Materials Showing Emergent Phenomena
T2 - Transitioning from Sixfold to Threefold Symmetry in Anisotropic ZnO Colloids
AU - Theiß, Sebastian
AU - Voggel, Michael
AU - Kuper, Henning
AU - Hoermann, Martin
AU - Krings, Ulrich
AU - Baum, Peter
AU - Becker, Joerg August
AU - Wittmann, Valentin
AU - Polarz, Sebastian
N1 - Funding Information: The research was funded by the German Research Foundation (DFG) within the collaborative research center SFB‐1214 project A1 and project Z1 Particle Analysis Center.
PY - 2021/2/17
Y1 - 2021/2/17
N2 - The central promise of nanoparticle-based materials is that cooperative properties may emerge, when individual quantum dots are positioned on a periodic lattice. Yet, there are only a few papers in the literature reporting such effects. Nevertheless, it is clear that the symmetry of the superlattice is decisive for the desired emergent phenomena. An interesting question is, how the symmetry of the initial monodisperse nanoparticles affects the structure of the colloidal crystal during self-assembly processes. For instance, particles with a hexagonal cross-section demonstrate self-organization, which is very similar to spherical colloids. Likewise, one would also expect that trigonal nanoparticles behave similarly. Unfortunately, it is very hard to obtain monodisperse semiconductor colloids with a trigonal shape, because this requires a symmetry break during morphogenesis of the nanocrystal. While such a symmetry break is known in the literature for structures attached to a solid substrate, herein, colloidal synthesis of trigonal ZnO nanorods is successfully demonstrated, and the mechanism is elucidated via experimental and theoretical methods. 2D-superlattices formed by such particles with trigonal cross-section are compared to hexagonal analogues. It is found that there are distinct differences, which result in important differences in properties such as the formation of voids and also in optical properties.
AB - The central promise of nanoparticle-based materials is that cooperative properties may emerge, when individual quantum dots are positioned on a periodic lattice. Yet, there are only a few papers in the literature reporting such effects. Nevertheless, it is clear that the symmetry of the superlattice is decisive for the desired emergent phenomena. An interesting question is, how the symmetry of the initial monodisperse nanoparticles affects the structure of the colloidal crystal during self-assembly processes. For instance, particles with a hexagonal cross-section demonstrate self-organization, which is very similar to spherical colloids. Likewise, one would also expect that trigonal nanoparticles behave similarly. Unfortunately, it is very hard to obtain monodisperse semiconductor colloids with a trigonal shape, because this requires a symmetry break during morphogenesis of the nanocrystal. While such a symmetry break is known in the literature for structures attached to a solid substrate, herein, colloidal synthesis of trigonal ZnO nanorods is successfully demonstrated, and the mechanism is elucidated via experimental and theoretical methods. 2D-superlattices formed by such particles with trigonal cross-section are compared to hexagonal analogues. It is found that there are distinct differences, which result in important differences in properties such as the formation of voids and also in optical properties.
KW - colloidal superstructures
KW - nanoparticle shape
KW - nanorods
KW - particle-based materials
KW - self-assembly
UR - http://www.scopus.com/inward/record.url?scp=85097737059&partnerID=8YFLogxK
U2 - 10.1002/adfm.202009104
DO - 10.1002/adfm.202009104
M3 - Article
AN - SCOPUS:85097737059
VL - 31
JO - Advanced functional materials
JF - Advanced functional materials
SN - 1616-301X
IS - 8
M1 - 2009104
ER -