Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment

Hugh Geaney; Catriona O'Sullivan; Robert D. Gunning; Ambarish Sanyal; Christopher A. Barrett; Fathima R. Laffir; Shafaat Ahmed; Kevin M. Ryan

doi:10.1021/ja902860t

Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment

Hugh Geaney, Catriona O'Sullivan, Robert D. Gunning, Ambarish Sanyal, Christopher A. Barrett, Fathima R. Laffir, Shafaat Ahmed, Kevin M. Ryan

Department of Chemical Sciences

University of Limerick

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English (Ireland)
Pages (from-to)	12250-12257
Number of pages	8
Journal	Journal of the American Chemical Society
Volume	131
Issue number	34
DOIs	https://doi.org/10.1021/ja902860t
Publication status	Published - 2 Sep 2009

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title = "Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment",

abstract = "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.",

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T1 - Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment

AU - Geaney, Hugh

AU - O'Sullivan, Catriona

AU - Gunning, Robert D.

AU - Sanyal, Ambarish

AU - Barrett, Christopher A.

AU - Laffir, Fathima R.

AU - Ahmed, Shafaat

AU - Ryan, Kevin M.

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N2 - 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.

AB - 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.

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Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment

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