Observation and manipulation of paramagnetic oxygen vacancies in Co-doped TiO2 nanocrystals

被引：43

作者：

Pan, Dengyu ^{[1
]}

Xu, Guoliang

Lv, Liya

Yong, Yuan

Wang, Xiuwei

Wan, Jianguo

Wang, Guanghou

机构：

[1] Nanjing Univ, Natl Lab Solid Microstruct, Dept Phys, Nanjing 210093, Peoples R China

[2] Nanjing Univ, Ctr Mat Anal, Nanjing 210093, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 08期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2335954

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electron paramagnetic resonance measurements were presented to investigate paramagnetic oxygen vacancies (F+ centers) in Co-doped TiO2 nanocrystals. Surface and interior F+ centers were manipulated by washing or/and annealing. Anisotropic surface F+ centers are so instable as to be destroyed at high temperature, while isotropic interior F+ centers are rather stable even at 430 degrees C. The correlation of ferromagnetism with F+ centers was observed, which provided direct experimental evidence for F+-center-mediated coupling in diluted magnetic oxides. (c) 2006 American Institute of Physics.

引用

页数：3

共 23 条

[1] Low-temperature activation and deactivation of high-Curie-temperature ferromagnetism in a new diluted magnetic semiconductor:: Ni2+-doped SnO2 [J].

Archer, PI ;

Radovanovic, PV ;

Heald, SM ;

Gamelin, DR .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (41) :14479-14487

[2] Activation of high-Tc ferromagnetism in Co2+:TiO2 and Cr3+:TiO2 nanorods and nanocrystals by grain boundary defects [J].

Bryan, JD ;

Santangelo, SA ;

Keveren, SC ;

Gamelin, DR .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (44) :15568-15574

[3] Strong room-temperature ferromagnetism in Co2+-doped TiO2 made from colloidal nanocrystals [J].

Bryan, JD ;

Heald, SM ;

Chambers, SA ;

Gamelin, DR .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (37) :11640-11647

[4] Epitaxial growth and properties of ferromagnetic co-doped TiO2 anatase [J].

Chambers, SA ;

Thevuthasan, S ;

Farrow, RFC ;

Marks, RF ;

Thiele, JU ;

Folks, L ;

Samant, MG ;

Kellock, AJ ;

Ruzycki, N ;

Ederer, DL ;

Diebold, U .

APPLIED PHYSICS LETTERS, 2001, 79 (21) :3467-3469

[5] Single electron traps at the surface of polycrystalline MgO: Assignment of the main trapping sites [J].

Chiesa, M ;

Paganini, MC ;

Spoto, G ;

Giamello, E ;

Di Valentin, C ;

Del Vitto, A ;

Pacchioni, G .

JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (15) :7314-7322

[6] Donor impurity band exchange in dilute ferromagnetic oxides [J].

Coey, JMD ;

Venkatesan, M ;

Fitzgerald, CB .

NATURE MATERIALS, 2005, 4 (02) :173-179

[7] Appearance of room-temperature ferromagnetism in Cu-doped TiO2-δ films -: art. no. 161313 [J].

Duhalde, S ;

Vignolo, MF ;

Golmar, F ;

Chiliotte, C ;

Torres, CER ;

Errico, LA ;

Cabrera, AF ;

Rentería, M ;

Sánchez, FH ;

Weissmann, M .

PHYSICAL REVIEW B, 2005, 72 (16)

[8] Intrinsic ferromagnetism in insulating cobalt doped anatase TiO2 -: art. no. 157204 [J].

Griffin, KA ;

Pakhomov, AB ;

Wang, CM ;

Heald, SM ;

Krishnan, KM .

PHYSICAL REVIEW LETTERS, 2005, 94 (15)

[9] DEFECTS IN ALKALINE EARTH OXIDES [J].

HENDERSON, B ;

WERTZ, JE .

ADVANCES IN PHYSICS, 1968, 17 (70) :749-+

[10] High purity anatase TiO2 nanocrystals:: Near room-temperature synthesis, grain growth kinetics, and surface hydration chemistry [J].

Li, GS ;

Li, LP ;

Boerio-Goates, J ;

Woodfield, BF .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (24) :8659-8666

← 1 2 3 →