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Liquid metals (such as gallium or Ga) exist in liquid states under ambient conditions and are hardly sculpted in chiral structures. Herein, through electron‐beam evaporation of Ga, hemispherical achiral Ga nanoparticles (NPs) are randomly immobilized along helical surfaces of SiO2 nanohelices (NHs), functioning as a chiral template. Helical assembly of Ga NPs shows chiroplasmonic optical activity...
Metallic chiral nanoparticles (CNPs) promisingly function as asymmetric catalysts but lack an important study in thermal stability of optical activity that stems from metastable chiral lattices. In this work, annealing is applied to silver (Ag) CNPs, fabricated by glancing angle deposition (GLAD), and causes elimination of optical activity at 200 °C, mainly ascribed to chiral‐to‐achiral lattice transformation...
Electron transporting layers (ETLs), required to be optically transparent in perovskite solar cells (PSCs) having regular structures, possess a determinant effect on electron extraction and collection. Metal oxides (e.g., TiO2) have overwhelmingly served as ETLs, but usually have low electron mobility (μe < 10−2 cm2 V−1 s−1) not favorable for photovoltaic conversion. Here, metal oxides are replaced...
Bulk metals lack chirality. Recently, metals have been sculptured with metastable chirality varying from the micro‐ to nano‐scale. The manipulation of molecular chirality could be novelly performed using metals composed of chiral lattices at atomic scales (i.e., chiral nanoparticles or CNPs) if one could fundamentally understand the interactions between molecules and the chiral metal lattices. The...
In article number 2001473, Zhifeng Huang and co‐workers introduce an emerging concept of metal chiral nanoparticles (CNPs), composed of chiral lattices at the atomic scale without containing chiral ligands. Metal CNPs are mainly generated by macroscopic shear forces applied with glancing angle deposition, and have unique asymmetric properties promisingly leading to prominent applications in the fields...
Metallic chiral nanoparticles (CNPs) with a nominal helical pitch (P) of sub‐10 nm contain inherent chirality and are promisingly applied to diverse prominent enantiomer‐related applications. However, the sub‐wavelength P physically results in weak optical activity (OA) to prohibit the development of these applications. Herein, a facile method to amplify the CNPs' OA by alloying the host CNPs with...
In article number 1807307, Ken Cham‐Fai Leung, Yonggang Yang, Zhifeng Huang, and co‐workers report silver chiral nanoparticles (AgCNPs) with a sub‐5 nm helical pitch lead devised for the enantioselective amplification of optical activity of adsorbed enantiomers with axial chirality, probably owing to enantiospecific adsorption of the enantiomers on the surface chiral lattices of AgCNPs.
Enantiodifferentiation is of fundamental importance in chiral chemistry and substantially requires high optical activity (OA) of enantiomers; but the enantiomeric OA is typically weak due to subwavelength molecular dimension, leading to a lack of sensitive enantiodifferentiation. A new approach is devised to evidently amplify the enantiomeric OA by anchoring axially chiral molecules containing the...
Ultraviolet (UV)‐resonant metals (e.g., aluminum) typically have low melting point to cause a fabrication difficulty in helical sculpture to generate plasmons with chiroptical activity in the UV region. In this work, using glancing angle deposition (GLAD), two new methods are devised to generate crystalline chiral Al nanostructures that have stable chiroptical response in the UV–visible region originating...
In article number 1701112, Zhifeng Huang and co‐workers report chiral aluminum nanostructures with strong, stable chiroptical activity in the UV‐visible region that are fabricated by glancing angle physical vapor deposition. The chiroptical activity originates from the hidden helicity or helicity duplication from the chiral host, and the latter can be generally adapted to diverse plasmonic metals...
Silver nanospirals with strong chiroptical activity (characterized by circular dichroism) are grafted with achiral alkyl ligands, resulting in a weakening of the chiroptical activity. The chiroptical weakening is exacerbated with increasing bond energy of the Ag‐ligand contacts, which is ascribed to the effective medium screening effect and electron withdrawal toward the alkyl ligands.
Silver nanospirals with strong chiroptical activity, characterized by circular dichroism, are grafted with achiral alkyl ligands to cause chiroptical activity to weaken, as presented by Z. F. Huang and co‐workers on page 6698. The chiroptical weakening is exacerbated by the increasing bond energy of the Ag‐ligand contacts, which is ascribed to the effective medium screening effect and electron withdrawal...
The geometrical prerequisite for forming a helix is P (helical pitch) > d (wire diameter). Limited by the current development of nanofabrication techniques, it is difficult to minimize d and consequently P to the sub‐10 nm molecule‐comparable scale, preventing the study of chiral plasmonics at dimensions approaching the physical limit. Herein, glancing angle deposition is operated at substrate...
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