Journal
NANOTECHNOLOGY
Volume 32, Issue 19, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/abe263
Keywords
magnetic nanoparticles; directed self-assembly; aerosol; electrostatic precipitator
Funding
- NanoLund
- Swedish Research Council [2013-05280, 2019-04970, 2018-05973]
- Crafoord foundation
- Vinnova [2013-05280] Funding Source: Vinnova
- Swedish Research Council [2019-04970, 2013-05280] Funding Source: Swedish Research Council
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Directed self-assembly of charged magnetic aerosolized nanoparticles with tunable size and composition has been demonstrated using combined electric and magnetic fields, resulting in a variety of nanostructures. The magnetization of nanoparticles and the orientation of external magnetic fields play key roles in governing the self-assembly process. These results highlight the potential of aerosol deposition in a combined electric and magnetic field for tailored bottom-up fabrication of nanostructures.
Directed self-assembly of nanoparticles (NPs) is a promising strategy for bottom-up fabrication of nanostructured materials with tailored composition and morphology. Here, we present a simple and highly flexible method where charged magnetic aerosolized (i.e. suspended in a gas) NPs with tunable size and composition are self-assembled into nanostructures using combined electric and magnetic fields. Size-selected Co, Ni, and Fe NPs have been generated by spark ablation, and self-assembled into different structures, ranging from one-dimensional nanochains to macroscopic three-dimensional networks. By comparing the resulting structures with simulations, we can conclude that the magnetization of the NPs governs the self-assembly through interparticle magnetic dipole-dipole interactions. We also show how the orientation of the external magnetic field directs the self-assembly into differently aligned nano- and macroscopic structures. These results demonstrate how aerosol deposition in a combined electric and magnetic field can be used for directed bottom-up self-assembly of nanostructures with specialized composition and morphology.
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