Abstract
The study of different chiral inorganic nanomaterials has been experiencing rapid growth during the past decade, with its primary focus on metals and semiconductors. Ceramic materials can substantially expand the range of mechanical, optical, chemical, electrical, magnetic, and biological properties of chiral nanostructures, further stimulating theoretical, synthetic, and applied research in this area. An ever-expanding toolbox of nanoscale engineering and self-organization provides a chirality-based methodology for engineering of hierarchically organized ceramic materials. However, fundamental discoveries and technological translations of chiral nanoceramics have received substantially smaller attention than counterparts from metals and semiconductors. Findings in this research area are scattered over a variety of sources and subfields. Here, the diversity of chemistries, geometries, and properties found in chiral ceramic nanostructures are summarized. They represent a compelling materials platform for realization of chirality transfer through multiple scales that can result in new forms of ceramic materials. Multiscale chiral geometries and the structural versatility of nanoceramics are complemented by their high chiroptical activity, enantioselectivity, catalytic activity, and biocompatibility. Future development in this field is likely to encompass chiral synthesis, biomedical applications, and optical/electronic devices. The implementation of computationally designed chiral nanoceramics for biomimetic catalysts and quantum information devices may also be expected.
Highlights
Chirality is the geometric property that describes an object that is not non-superimposable upon its mirror image
The methods of density functional theory (DFT) calculations and molecular dynamics (MD) simulations were used to demonstrate the distortion and displacement and can detected by circular dichroism (CD) spectroscopy and Raman optical activity.[22b, 38] the lattice distortions and atomic displacements in the NP cores can be retained after removing the ligands
The complexity and diversity of chiral ceramic nanostructures is quite remarkable and in this final section we focused on the preparation and potential applications of this rapidly evolving class of ceramic nanomaterials
Summary
Chirality is the geometric property that describes an object that is not non-superimposable upon its mirror image. 2.5 Glancing Angle Deposition Beside the wurtzite structural ceramic oxides, the universal way to control crystal growth with integrating glancing angle deposition (GLAD) in PVD process provided the solution and aroused researchers’ interests For this technique, the specific enantiomer of the chiral ceramic nanostructures can be obtained by variong the direction of the substrate rotation (Figure 2a).[70]. Another compelling work on chiral CuO nanostructures involves CuO flower-like superstructures.[88] They reported the surfactant-mediated hydrothermal synthesis of chiral CuO assemblies in the presence of “symmetry-breakers” (S)-(-)- and (R)-(+)-2-amino-3-phenyl-1-propanol ((S)-(-)- and (R)-(+)-APP) During this process, the cupric ions (Cu2+) served as a bridge, which linked the SDS and APP through electrostatic interaction and coordination bonding chelation, respectively (Figure 8a). The transparency of the chiral Co3O4 NP-gels to circularly polarized light beams in the ultraviolet range could be reversibly altered due to the rapid alignment of magnetic moments of cobalt atoms (Figure 12c).[22b]
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