High-Frequency EPR and ENDOR Spectroscopy of Mn 2+ Ions in CdSe/CdMnS Nanoplatelets.

Autor: Babunts RA; Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia., Uspenskaya YA; Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia., Romanov NG; Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia., Orlinskii SB; Kazan Federal University, Institute of Physics, 420008 Kazan, Russia., Mamin GV; Kazan Federal University, Institute of Physics, 420008 Kazan, Russia., Shornikova EV; Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany., Yakovlev DR; Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia.; Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany., Bayer M; Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany., Isik F; Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey., Shendre S; Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore., Delikanli S; Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore.; Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey., Demir HV; Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore.; Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey., Baranov PG; Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia.
Jazyk: angličtina
Zdroj: ACS nano [ACS Nano] 2023 Mar 14; Vol. 17 (5), pp. 4474-4482. Date of Electronic Publication: 2023 Feb 20.
DOI: 10.1021/acsnano.2c10123
Abstrakt: Semiconductor colloidal nanoplatelets based of CdSe have excellent optical properties. Their magneto-optical and spin-dependent properties can be greatly modified by implementing magnetic Mn 2+ ions, using concepts well established for diluted magnetic semiconductors. A variety of magnetic resonance techniques based on high-frequency (94 GHz) electron paramagnetic resonance in continuous wave and pulsed mode were used to get detailed information on the spin structure and spin dynamics of Mn 2+ ions in core/shell CdSe/(Cd,Mn)S nanoplatelets. We observed two sets of resonances assigned to the Mn 2+ ions inside the shell and at the nanoplatelet surface. The surface Mn demonstrates a considerably longer spin dynamics than the inner Mn due to lower amount of surrounding Mn 2+ ions. The interaction between surface Mn 2+ ions and 1 H nuclei belonging to oleic acid ligands is measured by means of electron nuclear double resonance. This allowed us to estimate the distances between the Mn 2+ ions and 1 H nuclei, which equal to 0.31 ± 0.04, 0.44 ± 0.09, and more than 0.53 nm. This study shows that the Mn 2+ ions can serve as atomic-size probes for studying the ligand attachment to the nanoplatelet surface.
Databáze: MEDLINE