posted on 2024-01-03, 18:07authored byQiming Liu, Xingjian Song, Davida DuBois, Bingzhe Yu, Amrinder Bhuller, Gabriel Flannery, Marcus Hawley, Frank Bridges, Shaowei Chen
Metal chalcogenide nanoparticles
play a vital role in a wide range
of applications and are typically stabilized by organic derivatives
containing thiol, amine, or carboxyl moieties, where the nonconjugated
particle–ligand interfaces limit the electronic interactions
between the inorganic cores and organic ligands. Herein, a wet-chemistry
method is developed for the facile preparation of stable platinum
chalcogenide (S, Se) nanoparticles capped with acetylene derivatives
(e.g., 4-ethylphenylacetylene, EPA). The formation of Pt–C
conjugated bonds at the nanoparticle interfaces, which is confirmed
by optical and X-ray spectroscopic measurements, leads to markedly
enhanced electronic interactions between the d electrons of the nanoparticle
cores and π electrons of the acetylene moiety, in stark contrast
to the mercapto-capped counterparts with only nonconjugated Pt–S–
interfacial bonds, as manifested in spectroscopic measurements and
density functional theory calculations. This study underscores the
significance of conjugated anchoring linkages in the stabilization
and functionalization of metal chalcogenides, a unique strategy for
diverse applications.