Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment.
Spontaneous elongation from nanorod to nanowire in the presence of an amine is reported for nanocrystals of cadmium sulfide and silver sulfide (cation exchanged from CdS). Elongation occurs instantaneously where the final aspect ratio is a controllable multiple of the original nanorod length. Transmission electron microscopy (TEM) analysis reveals the influential factors on the attachment process are the concentration of amine, duration and temperature of the reaction. The elongated nanorods are further characterized by X-ray diffraction (XRD), photoluminescence (PL), ultraviolet-visible spectroscopy (UV-vis) and X-ray photoelectron spectroscopy (XPS). A mechanism of oriented attachment is evidenced by the doubling in length of asymmetrically gold tipped CdS nanorods with the corresponding absence of elongation in symmetrically tipped nanorods.
O'Sullivan
Catriona
C
Materials and Surface Science Institute, and Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland.
Gunning
Robert D
RD
Sanyal
Ambarish
A
Barrett
Christopher A
CA
Geaney
Hugh
H
Laffir
Fathima R
FR
Ahmed
Shafaat
S
Ryan
Kevin M
KM