Chiral Nanoparticles with Enhanced Thermal Stability of Chiral Structures through Alloying

Yicong Ma, Chao Lin, Linfeng Cai, Geping Qu, Xiaopeng Bai, Lin Yang, Zhifeng Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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. The Ag CNPs are remarkedly enhanced in thermal stability through an alloying with aluminum (Al) via layer-by-layer GLAD to generate binary Ag0.5Al0.5 CNPs composed of solid-state liquids, whose optical activity vanishes at 700 °C. Ease in the diffusion of Al atoms in the host Ag CNPs and thermal insulation from the Al2O3 layers partially covering the binary CNPs effectively prohibit structural relaxation of the metastable chiral lattices, accounting for the significant enhancement in thermal stability of chiral lattices. This is a pioneering work to investigate the fundamental principles determining the thermal stability of metallic CNPs in terms of chiral structures and optical activity. It paves the way toward applying metallic CNPs to asymmetric catalysis at high temperature to accelerate an asymmetric synthesis of enantiomers with designable chirality, which is one of the most important topics in modern chemistry.

Original languageEnglish
Article number2107657
JournalSmall
Volume18
Issue number14
Early online date17 Feb 2022
DOIs
Publication statusPublished - 7 Apr 2022

Scopus Subject Areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

User-Defined Keywords

  • chiral lattices
  • chiral nanoparticles
  • glancing angle deposition
  • optical activity
  • thermal stability

Fingerprint

Dive into the research topics of 'Chiral Nanoparticles with Enhanced Thermal Stability of Chiral Structures through Alloying'. Together they form a unique fingerprint.

Cite this