Title
Luminescent <tex>$CuInS_{2}$</tex> quantum dots by partial cation exchange in <tex>$Cu_{2-x}S$</tex> nanocrystals Luminescent <tex>$CuInS_{2}$</tex> quantum dots by partial cation exchange in <tex>$Cu_{2-x}S$</tex> nanocrystals
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Physics
Chemistry
Source (journal)
Chemistry of materials
Volume/pages
27(2015) :2 , p. 621-628
ISSN
0897-4756
ISI
000348618400028
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Here, we show successful partial cation exchange reactions in Cu2-xS nanocrystals (NCs) yielding luminescent CuInS2 (CIS) NCs. Our approach of mild reaction conditions ensures slow Cu extraction rates, which results in a balance with the slow In incorporation rate. With this method, we obtain CIS NCs with photoluminescence (PL) far in the near-infrared (NIR), which cannot be directly synthesized by currently available synthesis protocols. We discuss the factors that favor partial, self-limited cation exchange from Cu2-xS to CIS NCs, rather than complete cation exchange to In2S3. The product CIS NCs have the wurtzite crystal structure, which is understood in terms of conservation of the hexagonal close packing of the anionic sublattice of the parent NCs into the product NCs. These results are an important step toward the design of CIS NCs with sizes and shapes that are not attainable by direct synthesis protocols and may thus impact a number of potential applications.
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Full text (open access)
https://repository.uantwerpen.be/docman/irua/4abc39/10825.pdf
E-info
https://repository.uantwerpen.be/docman/iruaauth/18c5c9/f4f10826.pdf
Handle