High-Frequency EPR and ENDOR Spectroscopy of Mn2+Ions in CdSe/CdMnS Nanoplatelets

被引：8

作者：

Babunts, Roman A. ^{[1
]}

Uspenskaya, Yulia A. ^{[1
]}

Romanov, Nikolai G. ^{[1
]}

Orlinskii, Sergei B. ^{[2
]}

Mamin, Georgy V. ^{[2
]}

Shornikova, Elena V. ^{[3
]}

Yakovlev, Dmitri R. ^{[1
,3
]}

Bayer, Manfred ^{[3
]}

Isik, Furkan ^{[4
]}

Shendre, Sushant ^{[5
]}

Delikanli, Savas ^{[4
,5
]}

Demir, Hilmi Volkan ^{[4
,5
]}

Baranov, Pavel G. ^{[1
]}

机构：

[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

来源：

ACS NANO | 2023年 / 17卷 / 05期

基金：

俄罗斯基础研究基金会;

关键词：

colloidal nanocrystals; CdSe nanoplatelets; diluted magnetic semiconductors; electron paramagnetic resonance; electron nuclear double resonance; ELECTRON-PARAMAGNETIC-RESONANCE; MAGNETIC POLARON; QUANTUM DOTS;

D O I：

10.1021/acsnano.2c10123

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：4474 / 4482

页数：9