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Title: Independent control of the shape and composition of ionic nanocrystals through sequential cation exchange reactions

Abstract

Size- and shape-controlled nanocrystal growth is intensely researched for applications including electro-optic, catalytic, and medical devices. Chemical transformations such as cation exchange overcome the limitation of traditional colloidal synthesis, where the nanocrystal shape often reflects the inherent symmetry of the underlying lattice. Here we show that nanocrystals, with established synthetic protocols for high monodispersity, can be templates for independent composition control. Specifically, controlled interconversion between wurtzite CdS, chalcocite Cu2S, and rock salt PbS occurs while preserving the anisotropic dimensions unique to the as-synthesized materials. Sequential exchange reactions between the three sulfide compositions are driven by the disparate solubilites of the metal ion exchange pair in specific coordinating molecules. Starting with CdS, highly anisotropic PbS nanorods are created, which serve as an important material for studying strong 2-dimensional quantum confinement, as well as for optoelectronic applications. Furthermore, interesting nanoheterostructures of CdS|PbS are obtained by precise control over ion insertion and removal.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Materials Sciences Division
OSTI Identifier:
974549
Report Number(s):
LBNL-2367E
TRN: US201007%%796
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Nature Chemistry
Additional Journal Information:
Journal Name: Nature Chemistry
Country of Publication:
United States
Language:
English
Subject:
75; 30; 36; 14; 77; CATIONS; CONFINEMENT; DIMENSIONS; ION EXCHANGE; REMOVAL; SALT DEPOSITS; SHAPE; SULFIDES; SYMMETRY; SYNTHESIS; TRANSFORMATIONS; PbS, lead sulfide, nanorods, cation exchange, copper sulfide, Cu2S, CdS, Cadmium sulfide, nanocrystal, quantum dots

Citation Formats

Luther, Joseph Matthew, Zheng, Haimei, Sadtler, Bryce, and Alivisatos, A Paul. Independent control of the shape and composition of ionic nanocrystals through sequential cation exchange reactions. United States: N. p., 2009. Web.
Luther, Joseph Matthew, Zheng, Haimei, Sadtler, Bryce, & Alivisatos, A Paul. Independent control of the shape and composition of ionic nanocrystals through sequential cation exchange reactions. United States.
Luther, Joseph Matthew, Zheng, Haimei, Sadtler, Bryce, and Alivisatos, A Paul. 2009. "Independent control of the shape and composition of ionic nanocrystals through sequential cation exchange reactions". United States. https://www.osti.gov/servlets/purl/974549.
@article{osti_974549,
title = {Independent control of the shape and composition of ionic nanocrystals through sequential cation exchange reactions},
author = {Luther, Joseph Matthew and Zheng, Haimei and Sadtler, Bryce and Alivisatos, A Paul},
abstractNote = {Size- and shape-controlled nanocrystal growth is intensely researched for applications including electro-optic, catalytic, and medical devices. Chemical transformations such as cation exchange overcome the limitation of traditional colloidal synthesis, where the nanocrystal shape often reflects the inherent symmetry of the underlying lattice. Here we show that nanocrystals, with established synthetic protocols for high monodispersity, can be templates for independent composition control. Specifically, controlled interconversion between wurtzite CdS, chalcocite Cu2S, and rock salt PbS occurs while preserving the anisotropic dimensions unique to the as-synthesized materials. Sequential exchange reactions between the three sulfide compositions are driven by the disparate solubilites of the metal ion exchange pair in specific coordinating molecules. Starting with CdS, highly anisotropic PbS nanorods are created, which serve as an important material for studying strong 2-dimensional quantum confinement, as well as for optoelectronic applications. Furthermore, interesting nanoheterostructures of CdS|PbS are obtained by precise control over ion insertion and removal.},
doi = {},
url = {https://www.osti.gov/biblio/974549}, journal = {Nature Chemistry},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 06 00:00:00 EDT 2009},
month = {Mon Jul 06 00:00:00 EDT 2009}
}