The migration of Mn2+ ions in Cd1-xMnxS nanocrystals: Thermal annealing control

被引：11

作者：

Dantas, N. O. ^{[2
]}

Freitas Neto, E. S. ^{[2
]}

Silva, R. S. ^{[6
]}

Chen, F. ^{[3
]}

Pereira-da-Silva, M. A. ^{[4
,5
]}

Lopez-Richard, V. ^{[1
]}

Marques, G. E. ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Dept Fis, BR-13560905 Sao Carlos, SP, Brazil

[2] Univ Fed Uberlandia, Inst Fis, LNMIS, BR-38400902 Uberlandia, MG, Brazil

[3] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP, Brazil

[4] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560250 Sao Carlos, SP, Brazil

[5] UNICEP, Ctr Univ Cent Paulista, BR-13563470 Sao Carlos, SP, Brazil

[6] Univ Fed Triangulo Mineiro, Dept Fis, BR-38025180 Uberaba, MG, Brazil

来源：

SOLID STATE COMMUNICATIONS | 2012年 / 152卷 / 05期

基金：

巴西圣保罗研究基金会;

关键词：

Nanocrystals; Mn ions diffusion; Diluted magnetic semiconductor; Thermal annealing; CDSE; DEPENDENCE;

D O I：

10.1016/j.ssc.2011.12.018

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

This work reports evidence of the induced migration of Mn2+ ions in Cd(1-x)MnxS nanocrystals (NCs) by selecting a specific thermal treatment for each sample. The growth and characterization of these magnetic dots were investigated by atomic force microscopy (AFM), optical absorption (OA), and electronic paramagnetic resonance (EPR) techniques. The comparison of experimental and simulated EPR spectra confirms the incorporation of Mn2+ ions both in the core and at the dot surface regions. The thermal treatment of a magnetic sample, via selected annealing temperature and/or time, affects the fine and hyperfine interaction constants which modify the shape and the intensity of the EPR transition spectrum. The identification of these changes has allowed tracing the magnetic ion migration from core to surface regions of a dot as well as inferring the local density of the magnetic impurity ions. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：337 / 340

页数：4

共 17 条

[1] Inorganic cluster syntheses of TM2+-doped quantum dots (CdSe, CdS, CdSe/CdS):: Physical property dependence on dopant locale [J].

Archer, Paul I. ;

Santangelo, Steven A. ;

Gamelin, Daniel R. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2007, 129 (31) :9808-9818

[2] Direct observation of sp-d exchange interactions in colloidal Mn2+- and Co2+-doped CdSe quantum dots [J].

Archer, Paul I. ;

Santangelo, Steven A. ;

Gamelin, Daniel R. .

NANO LETTERS, 2007, 7 (04) :1037-1043

[3] Exciton storage by Mn2+ in colloidal Mn2+-doped CdSe quantum dots [J].

Beaulac, Remi ;

Archer, Paul I. ;

van Rijssel, Jos ;

Meijerink, Andries ;

Gamelin, Daniel R. .

NANO LETTERS, 2008, 8 (09) :2949-2953

[4] ELECTRON ELECTRON AND ELECTRON-HOLE INTERACTIONS IN SMALL SEMICONDUCTOR CRYSTALLITES - THE SIZE DEPENDENCE OF THE LOWEST EXCITED ELECTRONIC STATE [J].

BRUS, LE .

JOURNAL OF CHEMICAL PHYSICS, 1984, 80 (09) :4403-4409

[5] Shape control of monodisperse CdS nanocrystals: Hexagon and pyramid [J].

Cheng, Yao ;

Wang, Yuansheng ;

Bao, Feng ;

Chen, Daqin .

JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (19) :9448-9451

[6] Self-purification in semiconductor nanocrystals [J].

Dalpian, Gustavo M. ;

Chelikowsky, James R. .

PHYSICAL REVIEW LETTERS, 2006, 96 (22)

[7] Optical properties of IV-VI quantum dots embedded in glass: Size-effects [J].

Dantas, N. O. ;

Qu, Fanyao ;

Monte, A. F. G. ;

Silva, R. S. ;

Morais, P. C. .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2006, 352 (32-35) :3525-3529

[8]

Dantas NO., 2002, J PHYS CHEM C, V106, P7453

[9] Doping semiconductor nanocrystals [J].

Erwin, SC ;

Zu, LJ ;

Haftel, MI ;

Efros, AL ;

Kennedy, TA ;

Norris, DJ .

NATURE, 2005, 436 (7047) :91-94

[10] Quantum-size-effect-enhanced dynamic magnetic interactions among doped spins in Cd1-xMnxSe nanocrystals [J].

Jian, WB ;

Fang, JY ;

Ji, TH ;

He, JB .

APPLIED PHYSICS LETTERS, 2003, 83 (16) :3377-3379

← 1 2 →