Synthesis of Pd-Au bimetallic nanocrystals via controlled overgrowth.
This paper describes the synthesis of Pd-Au bimetallic nanocrystals with controlled morphologies via a one-step seeded-growth method. Two different reducing agents, namely, L-ascorbic acid and citric acid, were utilized for the reduction of HAuCl(4) in an aqueous solution to control the overgrowth of Au on cubic Pd seeds. When L-ascorbic acid was used as the reducing agent, conformal overgrowth of Au on the Pd nanocubes led to the formation of Pd-Au nanocrystals with a core-shell structure. On the contrary, localized overgrowth of Au was observed when citric acid was used as the reducing agent, producing Pd-Au bimetallic dimers. Through this morphological control, we were able to tune the localized surface plasmon resonance peaks of Pd-Au bimetallic nanostructures in the visible region.
Department of Biomedical Engineering, Washington University, St. Louis, Missouri 63130, USA.
Byungkwon
B
Lim
Hirokazu
H
Kobayashi
Taekyung
T
Yu
Jinguo
J
Wang
Moon J
MJ
Kim
Zhi-Yuan
ZY
Li
Matthew
M
Rycenga
Younan
Y
Xia
D003460:Crystallization / Q000379:methods; D006046:Gold / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010165:Palladium / Q000737:chemistry*
D010165:Palladium; D006046:Gold