Tailoring of Colloidal HfO₂ Nanocrystals with Unique Morphologies and New Self-Assembly Features.

ABSTRACT: Advancing the synthesis of HfO₂ nanocrystals, a refined anhydrous protocol that enables kinetic trapping of the metastable tetragonal phase and modulates twinning defects in anisotropically grown monoclinic nanoprisms is presented. This evolved sol-gel approach examines the role of the capping agent tri-n-octylphosphine oxide (TOPO) and introduces a novel heating strategy with sequential growth stages. Replacement of TOPO with triphenylphosphine oxide (TPPO) leads to the formation of prismatic hafnia nanocrystals exhibiting pristine {011}-facets of the monoclinic phase. Furthermore, a hot-injection inspired heating approach yields sub-4 nm isotropic HfO₂ nanocrystals in the tetragonal phase, bypassing the need for aliovalent cation species. In contrast, a heat-

SUBMITTER: Ohlerth T 

PROVIDER: S-EPMC11935035 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature