High-Frequency EPR and ENDOR Spectroscopy of Mn2+Ions in CdSe/CdMnS Nanoplatelets
Creators
- 1. Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia
- 2. Kazan Fed Univ, Inst Phys, Kazan 420008, Russia
- 3. Tech Univ Dortmund, Expt Phys 2, D-44227 Dortmund, Germany
- 4. Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, Dept Elect & Elect Engn, Dept Phys, TR-06800 Ankara, Turkiye
- 5. Nanyang Technol Univ, Luminous Ctr Excellence Semicond Lighting & Displa, Sch Elect & Elect Engn, Sch Phys & Math Sci,Div Phys & Appl Phys,Sch Mat S, Singapore 639798, Singapore
Description
Semiconductor colloidal nanoplatelets based of CdSe have excellent optical properties. Their magneto-optical and spin-dependent properties can be greatly modified by implementing magnetic Mn2+ ions, using concepts well estab-lished 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 Mn2+ ions in core/shell CdSe/(Cd,Mn)S nanoplatelets. We observed two sets of resonances assigned to the Mn2+ 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 Mn2+ ions. The interaction between surface Mn2+ ions and 1H nuclei belonging to oleic acid ligands is measured by means of electron nuclear double resonance. This allowed us to estimate the distances between the Mn2+ ions and 1H nuclei, which equal to 0.31 +/- 0.04, 0.44 +/- 0.09, and more than 0.53 nm. This study shows that the Mn2+ ions can serve as atomic-size probes for studying the ligand attachment to the nanoplatelet surface.
Files
bib-4e31eae2-6d23-41c3-8212-299686c1b357.txt
Files
(289 Bytes)
| Name | Size | Download all |
|---|---|---|
|
md5:3d788bed65549e905a09bb94dc19388c
|
289 Bytes | Preview Download |