Titanium Niobate and Titanium Tantalate Nanosheets as Strong Solid Acid Catalysts

Takagaki, Atsushi; Yoshida, Toshiki; Lu, Darling; Kondo, Junko N.; Hara, Michikazu; Domen, Kazunari; Hayashi, Shigenobu

doi:10.1021/jp049170e

Cited by 104 publications

(74 citation statements)

References 17 publications

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“…Thus, the surrounding water molecules around Eu 3+ in the interlayer promote the energy transfer process to the Eu 3+ . There are several reports on the state of the hydrogen bonds on the surface of the nanosheet and TiO 2 using 1 H NMR [26][27][28][29][30]. Takagaki and Domen et al reported that there are several types of OH groups in the exfoliated HTiNbO 5 [26,27].…”

Section: Resultsmentioning

confidence: 99%

“…There are several reports on the state of the hydrogen bonds on the surface of the nanosheet and TiO 2 using 1 H NMR [26][27][28][29][30]. Takagaki and Domen et al reported that there are several types of OH groups in the exfoliated HTiNbO 5 [26,27]. Nosaka et al reported that the H 2 O molecules with high mobility were increased on the TiO 2 surface by UV irradiation [28][29][30].…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets

Ida

Ogata

Matsumoto

2009

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Layered oxides intercalated with Eu3+ ions were prepared by self-assembly deposition method based on the electrostatic interaction between negative charged oxide nanosheets and Eu 3+ ions. The layered oxides were composed of two-dimensional host nanosheet layer with guest Eu 3+ ions and gave Eu 3+ emission based on an energy transfer from bandgap excitation of the host oxide nanosheets to the Eu 3+ ions. The photoluminescence properties of the Eu 3+ ions were influenced by the type of nanosheet and the intercalated water molecules. Relatively-strong emission of Eu 3+ was observed from Eu 3+ -intercalated titanate layered oxide. The intensity of Eu 3+ emission increased with increasing the amount of intercalated water molecules. This indicates that the energy transfer from TiO 2-δ nanosheet to Eu 3+ is promoted by the intercalated water molecules. In addition, the intensity of Eu 3+ emission was stronger at high pH than at low pH. This emission change is presumably due to two phenomena. One is a fine hydration state change of Eu 3+ in the interlayer, and the other is a change in energy transfer from the TiO 2-δ nanosheet to Eu 3+ . IntroductionLayered oxides composed of two-dimensional host oxide layers with guest cations have various interesting properties such as superconducting [1], ferroelectric [2] and photocatalytic properties [3]. These properties strongly depend on the combination between the host layers and the guest cations. Therefore, controlling the combination of layer structure is an important technique for material developing. Generally, two main soft-solution processes are utilized for the preparation of layered structure with desired guest cation into the interlayer. One is the ion-exchange technique carried out in an aqueous solution of a cation of interest, which is substituted for an alkaline cation of the starting layered oxide [4][5][6][7]. The other one is the direct assembly of a host oxide nanosheet and a cation of interest in a solution due to the electrostatic interaction. The latter technique is superior to the former in terms of easy and optimal intercalation of the guest cation. In the latter technique, two methods such as the electrostatic self-assembly deposition (ESD) [8] and layer-by-layer assembly (LBL) techniques [9][10][11] are available to prepare the desired layered oxides. Various kinds of intercalated layered oxides can be easily prepared under controlled pH in a solution by the ESD method, while the LBL method allows us to control the number of layers deposited on a substrate. Nanosheets can be prepared by exfoliation of layered compounds [12][13][14][15][16][17][18]. For instance, TiO 2-δ -type nanosheets [12], perovskite-type nanosheets [13][14][15] and hydroxide-type nanosheets [16,17] have been reported. The layered compounds prepared by ESD and LBL techniques have been studied in

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets

Ida

Ogata

Matsumoto

2009

IOP Conf. Ser.: Mater. Sci. Eng.

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“…TiTaO5 − nanosheets were prepared according to the procedure described in the literature [15]. The addition of a TbCl3 (0.1 M 50 ml, pH = 1) or Eu(NO3)3 (0.1 M 6 ml, 0925-8388/$ -see front matter.…”

Section: Methodsmentioning

confidence: 99%

Photoluminescence of nanosheets doped with rare earth ions

Zhang

Jiang

et al. 2010

Journal of Alloys and Compounds

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“…In the case of metal oxides, protonation usually resulted in electrostatic repulsions that facilitated exfoliation. By this procedure, single layers of Ti oxides, [19][20][21][22] Mn oxides, 23 Nb/Ta oxides, [24][25][26] Mo oxides, 27 Ru oxides, 28 and W oxides, 29 as well as sheets of several perovskites 7,9,[30][31][32][33][34][35] have been separated from bulk samples (Fig. 2).…”

Section: Synthesis Of Oxide Nanosheetsmentioning

confidence: 99%

Chemical Nanomanipulation of Two-Dimensional Nanosheets and Its Applications

Osada¹,

Sasaki²

2011

Nanofabrication

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Titanium Niobate and Titanium Tantalate Nanosheets as Strong Solid Acid Catalysts

Cited by 104 publications

References 17 publications

Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets

Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets

Photoluminescence of nanosheets doped with rare earth ions

Chemical Nanomanipulation of Two-Dimensional Nanosheets and Its Applications

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Titanium Niobate and Titanium Tantalate Nanosheets as Strong Solid Acid Catalysts

Cited by 104 publications

References 17 publications

Synthesis and photoluminescence properties of layered oxides intercalated with Eu3+ions by electrostatic self-assembly method using oxide nanosheets

Synthesis and photoluminescence properties of layered oxides intercalated with Eu3+ions by electrostatic self-assembly method using oxide nanosheets

Photoluminescence of nanosheets doped with rare earth ions

Chemical Nanomanipulation of Two-Dimensional Nanosheets and Its Applications

Contact Info

Product

Resources

About

Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets

Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets