Controlling the shapes of silver nanocrystals with different capping agents.
This paper provides direct evidence to support the role of a capping agent in controlling the evolution of Ag seeds into nanocrystals with different shapes. Starting with single-crystal seeds (spherical or cubic in shape), we could selectively obtain Ag octahedrons enclosed by {111} facets and nanocubes/nanobars enclosed by {100} facets by adding sodium citrate (Na(3)CA) and poly(vinyl pyrrolidone) (PVP), respectively, as a capping agent while all other parameters were kept the same. This research not only offers new insights into the role played by a capping agent in shape-controlled synthesis but also provides, for the first time, Ag octahedrons as small as 40 nm in edge length for optical and spectroscopic studies.
Department of Biomedical Engineering, Washington University, St. Louis, Missouri 63130, USA.
Jie
J
Zeng
Yiqun
Y
Zheng
Matthew
M
Rycenga
Jing
J
Tao
Zhi-Yuan
ZY
Li
Qiang
Q
Zhang
Yimei
Y
Zhu
Younan
Y
Xia
D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
D012834:Silver