Cu2Se and Cu Nanocrystals as Local Sources of Copper in Thermally Activated In Situ Cation Exchange
Botton, Gianluigi A.
Kahaly, M. Upadhyay
De Donato, Francesco
Lentijo Mozo, Sergio
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Computational Physics and Materials Science (CPMS)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2016-02-03
Print Publication Date2016-02-23
Permanent link to this recordhttp://hdl.handle.net/10754/595373
MetadataShow full item record
AbstractAmong the different synthesis approaches to colloidal nanocrystals a recently developed toolkit is represented by cation exchange reactions, where the use of template nanocrystals gives access to materials that would be hardly attainable via direct synthesis. Besides, post-synthetic treatments, such as thermally activated solid state reactions, represent a further flourishing route to promote finely controlled cation exchange. Here, we report that, upon in situ heating in a transmission electron microscope, Cu2Se nanocrystals deposited on an amorphous solid substrate undergo partial loss of Cu atoms, which are then engaged in local cation exchange reactions with Cu “acceptors” phases represented by rod- and wire- shaped CdSe nanocrystals. This thermal treatment slowly transforms the initial CdSe nanocrystals into Cu2-xSe nanocrystals, through the complete sublimation of Cd and the partial sublimation of Se atoms. Both Cu “donor” and “acceptor” particles were not always in direct contact with each other, hence the gradual transfer of Cu species from Cu2Se or metallic Cu to CdSe nanocrystals was mediated by the substrate and depended on the distance between the donor and acceptor nanostructures. Differently from what happens in the comparably faster cation exchange reactions performed in liquid solution, this study shows that slow cation exchange reactions can be performed at the solid state, and helps to shed light on the intermediate steps involved in such reactions.
CitationCu2Se and Cu Nanocrystals as Local Sources of Copper in Thermally Activated In Situ Cation Exchange 2016 ACS Nano
PublisherAmerican Chemical Society (ACS)
- Cu Vacancies Boost Cation Exchange Reactions in Copper Selenide Nanocrystals.
- Authors: Lesnyak V, Brescia R, Messina GC, Manna L
- Issue date: 2015 Jul 29
- Sequential cation exchange in nanocrystals: preservation of crystal phase and formation of metastable phases.
- Authors: Li H, Zanella M, Genovese A, Povia M, Falqui A, Giannini C, Manna L
- Issue date: 2011 Nov 9
- Colloidal CdSe/Cu3P/CdSe nanocrystal heterostructures and their evolution upon thermal annealing.
- Authors: De Trizio L, De Donato F, Casu A, Genovese A, Falqui A, Povia M, Manna L
- Issue date: 2013 May 28
- Cation exchange reactions in colloidal branched nanocrystals.
- Authors: Miszta K, Dorfs D, Genovese A, Kim MR, Manna L
- Issue date: 2011 Sep 27
- Octapod-shaped colloidal nanocrystals of cadmium chalcogenides via "one-pot" cation exchange and seeded growth.
- Authors: Deka S, Miszta K, Dorfs D, Genovese A, Bertoni G, Manna L
- Issue date: 2010 Sep 8