TY - JOUR
T1 - Revisiting the Anion Framework Conservation in Cation Exchange Processes
AU - Meir, Noga
AU - Martin-Garcia, Beatriz
AU - Moreels, Iwan
AU - Oron, Dan
N1 - The authors thank M. Kazes (WIS) for important contributions at the early stages of this work and for helpful discussions throughout it. F. Drago and G. La Rosa (IIT) are acknowledged for performing the ICP-OES measurements. The authors declare no competing financial interest. Funding Information This work is funded by the Ministry of Science, Technology and Space of the state of Israel, the Ministero degli Affari Esteri e della Cooperazione Internazionale of Italy (IONX-NC4SOL), and by the Crown Photonics Center of the Weizmann Institute of Science. This project has also received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 696656 (GrapheneCore1).
PY - 2016/11/8
Y1 - 2016/11/8
N2 - We investigated the effect of cation exchange on the anionic framework of lightly doped CdSe:Te/CdS nanorods. In contrast with previously studied core/shell systems, the Te dopant, located in the center of the CdSe core, provides an extremely sensitive indicator for any structural changes of the anionic framework that may occur as a result of the cation exchange process. We first optimized the cation exchange procedure in order to retain the fluorescence properties of the CdSe:Te/CdS nanorods after exchange of Cd2+ for Cu+ and back to Cd2+. Next, using multiexciton spectroscopy, we were able to probe the magnitude of the exciton exciton repulsion interaction and use that to assess the degree of crystal structure conservation. Our findings provide a much stronger proof that the anion framework is indeed rigid, showing no evidence of significant migration of the anionic dopant.
AB - We investigated the effect of cation exchange on the anionic framework of lightly doped CdSe:Te/CdS nanorods. In contrast with previously studied core/shell systems, the Te dopant, located in the center of the CdSe core, provides an extremely sensitive indicator for any structural changes of the anionic framework that may occur as a result of the cation exchange process. We first optimized the cation exchange procedure in order to retain the fluorescence properties of the CdSe:Te/CdS nanorods after exchange of Cd2+ for Cu+ and back to Cd2+. Next, using multiexciton spectroscopy, we were able to probe the magnitude of the exciton exciton repulsion interaction and use that to assess the degree of crystal structure conservation. Our findings provide a much stronger proof that the anion framework is indeed rigid, showing no evidence of significant migration of the anionic dopant.
UR - http://www.scopus.com/inward/record.url?scp=84994718762&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.6b03332
DO - 10.1021/acs.chemmater.6b03332
M3 - مقالة
SN - 0897-4756
VL - 28
SP - 7872
EP - 7877
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 21
ER -