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Colloidal Synthesis of Nanohelices via Bilayer Lattice Misfit
journal contribution
posted on 2020-07-07, 14:39 authored by Yang Liu, Yuda Li, Soojin Jeong, Yi Wang, Jun Chen, Xingchen YeHelical
structures are ubiquitous in natural and synthetic materials
across multiple length scales. Excellent and sometimes unusual chiral
optical, mechanical, and sensing properties have been previously demonstrated
in such symmetry-breaking shape, yet a general principle to realize
helical structures at the sub-100 nm scale via colloidal synthesis
remains underexplored. In this work, we describe the wet-chemical
synthesis of monodisperse nanohelices based on gadolinium oxide (Gd2O3). Aberration-corrected electron microscopy revealed
that individual nanohelices consist of a bilayer structure with the
outer and inner layers derived from the {111} and {100} planes of
bulk Gd2O3, respectively. Distinct from existing
inorganic nanocoils with flexible bending geometries, the built-in
lattice misfit between two adjacent crystal planes induces continuous
helical growth yielding three-dimensional rigid nanohelices. Furthermore,
the presence of water in the reaction was found to suppress the formation
of nanohelices, producing nanoplates expressing predominantly {111}
planes. Our study not only provides a bottom-up synthetic route and
mechanistic understanding of nanohelices formation but may also open
up new possibilities for creating chiral plasmonic nanostructures,
luminescent biological labels, and nanoscale transducers.
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Colloidal Synthesishelical growthnanoscale transducerslattice misfitGd 2 O 3sub -100 nm scalehelical structuressymmetry-breaking shapechiral plasmonic nanostructuresbulk Gd 2 O 3Aberration-corrected electron micro...gadolinium oxideBilayer Lattice Misfit Helical stru...crystal planeslength scalesnanohelices formationwet-chemical synthesisbilayer structure
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