1 research outputs found
Surface Topographical Engineering of Chiral Au Nanocrystals with Chiral Hot Spots for Plasmon-Enhanced Chiral Discrimination
Surface roughness in chiral plasmonic
nanostructures generates
asymmetrical localized electromagnetic fields, which hold great promise
for applications in chiral recognition, chiroptical spectroscopic
sensing, and enantioselective photocatalysis. In this study, we develop
a surface topographical engineering approach to precisely manipulate
the surface structures of chiral Au nanocrystals. Through carefully
controlling the amounts of l- or d-cystine (Cys)
and the seed solution in the growth process, we successfully synthesize
chiral Au nanocrystals with highly disordered, ordered, and less ordered
wrinkled surfaces. An underlying principle governing the relationship
between surface roughness, orderliness, and chiroptical response is
also proposed. More importantly, the chiral ordered wrinkles on the
surfaces of the nanocrystals generate asymmetrical localized electronic
fields with enhanced intensity, which achieve excellent plasmon-enhanced
chiral discrimination ability for penicillamine (Pen) enantiomers.
This work offers exciting prospects for manipulating the surface structures
of chiral nanocrystals and designing highly sensitive plasmon-enhanced
enantioselective sensors with chiral hot spots