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

Research output: Contribution to journalArticle

47 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 languageEnglish
Pages (from-to)4366-4373
Number of pages8
JournalChemistry of Materials
Volume21
Issue number19
DOIs
Publication statusPublished - 2009 Oct 13
Externally publishedYes

Fingerprint

Nanosheets
Titanium
Doping (additives)
Thin films
Magnetic hysteresis
Ferromagnetism
Multilayer films
Dichroism
Hysteresis loops
Electronic structure
titanium dioxide
Ion exchange
X ray photoelectron spectroscopy
Ions
Acids

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Dong, X., Osada, M., Ueda, H., Ebina, Y., Kotani, Y., Ono, K., ... Sasaki, T. (2009). Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping. Chemistry of Materials, 21(19), 4366-4373. https://doi.org/10.1021/cm900210m

Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping. / Dong, Xiaoping; Osada, Minoru; Ueda, Hidekazu; Ebina, Yasuo; Kotani, Yoshinori; Ono, Kanta; Ueda, Shigenori; Kobayashi, Keisuke; Takada, Kazunori; Sasaki, Takayoshi.

In: Chemistry of Materials, Vol. 21, No. 19, 13.10.2009, p. 4366-4373.

Research output: Contribution to journalArticle

Dong, X, Osada, M, Ueda, H, Ebina, Y, Kotani, Y, Ono, K, Ueda, S, Kobayashi, K, Takada, K & Sasaki, T 2009, 'Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping', Chemistry of Materials, vol. 21, no. 19, pp. 4366-4373. https://doi.org/10.1021/cm900210m
Dong, Xiaoping ; Osada, Minoru ; Ueda, Hidekazu ; Ebina, Yasuo ; Kotani, Yoshinori ; Ono, Kanta ; Ueda, Shigenori ; Kobayashi, Keisuke ; Takada, Kazunori ; Sasaki, Takayoshi. / Synthesis of mn-substituted titania nanosheets and ferromagnetic thin films with controlled doping. In: Chemistry of Materials. 2009 ; Vol. 21, No. 19. pp. 4366-4373.
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