Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping

Xiaoping Dong; Minoru Osada; Hidekazu Ueda; Yasuo Ebina; Yoshinori Kotani; Kanta Ono; Shigenori Ueda; Keisuke Kobayashi; Kazunori Takada; Takayoshi Sasaki

doi:10.1021/cm900210m

Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping

Xiaoping Dong, Minoru Osada^*, Hidekazu Ueda, Yasuo Ebina, Yoshinori Kotani, Kanta Ono, Shigenori Ueda, Keisuke Kobayashi, Kazunori Takada, Takayoshi Sasaki

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

We report the synthesis of Mn-substituted titania nanosheets and the preparation of roomtemperature 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- MnxO4], 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 controlledMn doping was achieved in exfoliated Ti(5.2-2x)/6Mnx/2O2 (x=0.0-0.4) nanosheets, where Li+ ions 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)/6-Mnx/2O2 was also employed to characterize the doping effect on electronic structures.

Original language	English
Pages (from-to)	4366-4373
Number of pages	8
Journal	Chemistry of Materials
Volume	21
Issue number	19
DOIs	https://doi.org/10.1021/cm900210m
Publication status	Published - 2009 Oct 13
Externally published	Yes

ASJC Scopus subject areas

Materials Chemistry
Chemical Engineering(all)
Chemistry(all)

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10.1021/cm900210m

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@article{5780b0baf20d41768f71815689773e99,

title = "Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping",

abstract = "We report the synthesis of Mn-substituted titania nanosheets and the preparation of roomtemperature 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- MnxO4], 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 controlledMn doping was achieved in exfoliated Ti(5.2-2x)/6Mnx/2O2 (x=0.0-0.4) nanosheets, where Li+ ions 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)/6-Mnx/2O2 was also employed to characterize the doping effect on electronic structures.",

author = "Xiaoping Dong and Minoru Osada and Hidekazu Ueda and Yasuo Ebina and Yoshinori Kotani and Kanta Ono and Shigenori Ueda and Keisuke Kobayashi and Kazunori Takada and Takayoshi Sasaki",

year = "2009",

month = oct,

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doi = "10.1021/cm900210m",

language = "English",

volume = "21",

pages = "4366--4373",

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publisher = "American Chemical Society",

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T1 - Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping

AU - Dong, Xiaoping

AU - Osada, Minoru

AU - Ueda, Hidekazu

AU - Ebina, Yasuo

AU - Kotani, Yoshinori

AU - Ono, Kanta

AU - Ueda, Shigenori

AU - Kobayashi, Keisuke

AU - Takada, Kazunori

AU - Sasaki, Takayoshi

PY - 2009/10/13

Y1 - 2009/10/13

N2 - We report the synthesis of Mn-substituted titania nanosheets and the preparation of roomtemperature 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- MnxO4], 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 controlledMn doping was achieved in exfoliated Ti(5.2-2x)/6Mnx/2O2 (x=0.0-0.4) nanosheets, where Li+ ions 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)/6-Mnx/2O2 was also employed to characterize the doping effect on electronic structures.

AB - We report the synthesis of Mn-substituted titania nanosheets and the preparation of roomtemperature 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- MnxO4], 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 controlledMn doping was achieved in exfoliated Ti(5.2-2x)/6Mnx/2O2 (x=0.0-0.4) nanosheets, where Li+ ions 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)/6-Mnx/2O2 was also employed to characterize the doping effect on electronic structures.

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U2 - 10.1021/cm900210m

DO - 10.1021/cm900210m

M3 - Article

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JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 19

ER -

Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping

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