Synthesis of Mn-Substituted Titania Nanosheets and Ferromagnetic Thin Films with Controlled Doping

被引：55

作者：

Dong, Xiaoping ^{[1
]}

Osada, Minoru ^{[1
,2
]}

Ueda, Hidekazu ^{[1
]}

Ebina, Yasuo ^{[1
,2
]}

Kotani, Yoshinori ^{[3
]}

Ono, Kanta ^{[3
]}

Ueda, Shigenori ^{[4
]}

Kobayashi, Keisuke ^{[4
]}

Takada, Kazunori ^{[1
,2
]}

Sasaki, Takayoshi ^{[1
,2
]}

机构：

[1] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki 3050044, Japan

[2] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

[3] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[4] Natl Inst Mat Sci, NIMS Beamline Stn SPring 8, Mikazuki, Hyogo 6795148, Japan

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 19期

关键词：

RAY PHOTOELECTRON-SPECTROSCOPY; LAYERED DOUBLE HYDROXIDES; POSITIVELY CHARGED NANOSHEETS; ROOM-TEMPERATURE; ULTRATHIN FILMS; COMPOSITE FILMS; DOPED ZNO; GROWTH; OXIDE; DELAMINATION;

D O I：

10.1021/cm900210m

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the synthesis of Mn-substituted titania nanosheets and the preparation of room-temperature ferromagnetic thin films via layer-by-layer assembly of these nanosheets. Ti(5.2-2x)/6Mnx/2O2 (x = 0.0-0.4) nanosheets were synthesized by delaminating layered titanates [K0.8Ti(5.2-2x)/3Li(0.8-x)/3-MnxO(4)], in which the Mn content was systematically controlled by Li+ doping. We found that Mn content in the host layers was preserved upon exfoliation, and controlled Mn doping was achieved in exfoliated Ti(5.2-2x)/6Mnx/2O2 (x = 0.0-0.4) nanosheets, where Li+ tons were completely extracted by acid-exchange reaction in the exfoliation process. The multilayer films of Ti(5.2-2x)/6Mnx/2O2 (x = 0.0-0.4) nanosheets exhibit a clear magnetic hysteresis loop at room-temperature in similar to what observed in ferromagnetic Ti1-xCoxO2 nanosheets. Electronic absorption, magnetic circular dichroism, and hard X-ray photoelectron spectroscopy were used to identify Mn-derived states, and analyze the properties of these states related to ferromagnetism. The first-principles calculation of Ti(5.2-2x)/6Mnx/2O2 was also employed to characterize the doping effect on electronic structures.

引用

页码：4366 / 4373

页数：8

共 47 条

[1] Large magneto-optical effect in an oxide diluted magnetic semiconductor Zn1-xCoxO [J].

Ando, K ;

Saito, H ;

Jin, ZW ;

Fukumura, T ;

Kawasaki, M ;

Matsumoto, Y ;

Koinuma, H .

APPLIED PHYSICS LETTERS, 2001, 78 (18) :2700-2702

[2]

Ando K., 2000, MAGNETO OPTICS

[3]

APPLEMAN DE, 1973, PB6188 DEP COMM NAT

[4] Effects of disorder on ferromagnetism in diluted magnetic semiconductors [J].

Berciu, M ;

Bhatt, RN .

PHYSICAL REVIEW LETTERS, 2001, 87 (10) :1-107203

[5]

BOOTH RC, 1984, J PHYS D APPL PHYS, V17, P579, DOI 10.1088/0022-3727/17/3/015

[6] Structural refinement and crystal chemistry of Mn-doped spinel:: A case for tetrahedrally coordinated Mn3+ in an oxygen-based structure [J].

Bosi, Ferdinando ;

Halenius, Ulf ;

Andreozzi, Giovanni B. ;

Skogby, Henrik ;

Lucchesi, Sergio .

AMERICAN MINERALOGIST, 2007, 92 (01) :27-33

[7] Synthesis, optical, and magnetic properties of diluted magnetic semiconductor Zn1-xMnxO nanowires via vapor phase growth [J].

Chang, YQ ;

Wang, DB ;

Luo, XH ;

Xu, XY ;

Chen, XH ;

Li, L ;

Chen, CP ;

Wang, RM ;

Xu, J ;

Yu, DP .

APPLIED PHYSICS LETTERS, 2003, 83 (19) :4020-4022

[8] Effects of rapid thermal annealing on the ferromagnetic properties of sputtered Zn1-x(Co0.5Fe0.5)xO thin films [J].

Cho, YM ;

Choo, WK ;

Kim, H ;

Kim, D ;

Ihm, Y .

APPLIED PHYSICS LETTERS, 2002, 80 (18) :3358-3360

[9] Ferromagnetism in Fe-doped SnO2 thin films [J].

Coey, JMD ;

Douvalis, AP ;

Fitzgerald, CB ;

Venkatesan, M .

APPLIED PHYSICS LETTERS, 2004, 84 (08) :1332-1334

[10] SnO2 doped with Mn, Fe or Co:: Room temperature dilute magnetic semiconductors [J].

Fitzgerald, CB ;

Venkatesan, M ;

Douvalis, AP ;

Huber, S ;

Coey, JMD ;

Bakas, T .

JOURNAL OF APPLIED PHYSICS, 2004, 95 (11) :7390-7392

← 1 2 3 4 5 →