Homogeneously dispersed CeO 2 nanoparticles on exfoliated hexaniobate nanosheets

Thalles M.F. Marques, Megan E. Strayer, Anupama Ghosh, Alexandre Silva, Odair P. Ferreira, Kazunori Fujisawa, Jose R. Alves da Cunha, Guilherme J.P. Abreu, Mauricio Terrones Maldonado, Thomas E. Mallouk, Bartolomeu C. Viana

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Hexaniobate nanosheets derived from the parent compound K 4 Nb 6 O 17 have been decorated with CeO 2 nanoparticles by ion exchange with aqueous cerium (IV) solution. Very homogeneous CeO 2 nanoparticle decoration of the hexaniobate sheets can be achieved by this method and the resulting composites may absorb visible light. HRTEM images show that ∼3.0 nm diameter CeO 2 nanoparticles adhere to hexaniobate nanosheets that are exfoliated and then restacked prior to Ce deposition. The interfacial interaction between CeO 2 nanoparticles and nanosheets would be due to an electrostatic attraction mechanism. Raman and XRD measurements have given strong evidence that CeO 2 nanoparticles have fluorite structure. EDS, FTIR and XPS results suggest almost complete exchange of TBA + and K + by Ce 4+ . Cerium ion exchange on the acid exchanged parent compound, H 2.9 K 1.1 Nb 6 O 17 , revealed that the extent of Ce ion exchange is much greater in case of nanosheets, which may be rationalized by the larger surface area available after exfoliation. XPS measurements show that the ratio of Ce 4+ /Ce 3+ is around 4.4, in agreement with the formation of fluorite structure (CeO 2 ). Thus, these CeO 2 nanoparticle/nanosheet composites may be useful for catalytic processes.

Original languageEnglish (US)
Pages (from-to)335-342
Number of pages8
JournalJournal of Physics and Chemistry of Solids
Volume111
DOIs
StatePublished - Dec 1 2017

Fingerprint

Nanosheets
Nanoparticles
nanoparticles
Cerium
Ion exchange
Fluorspar
fluorite
cerium
X ray photoelectron spectroscopy
ions
composite materials
Composite materials
attraction
Energy dispersive spectroscopy
Electrostatics
electrostatics
acids
Acids
interactions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Marques, T. M. F., Strayer, M. E., Ghosh, A., Silva, A., Ferreira, O. P., Fujisawa, K., ... Viana, B. C. (2017). Homogeneously dispersed CeO 2 nanoparticles on exfoliated hexaniobate nanosheets Journal of Physics and Chemistry of Solids, 111, 335-342. https://doi.org/10.1016/j.jpcs.2017.08.027
Marques, Thalles M.F. ; Strayer, Megan E. ; Ghosh, Anupama ; Silva, Alexandre ; Ferreira, Odair P. ; Fujisawa, Kazunori ; Alves da Cunha, Jose R. ; Abreu, Guilherme J.P. ; Terrones Maldonado, Mauricio ; Mallouk, Thomas E. ; Viana, Bartolomeu C. / Homogeneously dispersed CeO 2 nanoparticles on exfoliated hexaniobate nanosheets In: Journal of Physics and Chemistry of Solids. 2017 ; Vol. 111. pp. 335-342.
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abstract = "Hexaniobate nanosheets derived from the parent compound K 4 Nb 6 O 17 have been decorated with CeO 2 nanoparticles by ion exchange with aqueous cerium (IV) solution. Very homogeneous CeO 2 nanoparticle decoration of the hexaniobate sheets can be achieved by this method and the resulting composites may absorb visible light. HRTEM images show that ∼3.0 nm diameter CeO 2 nanoparticles adhere to hexaniobate nanosheets that are exfoliated and then restacked prior to Ce deposition. The interfacial interaction between CeO 2 nanoparticles and nanosheets would be due to an electrostatic attraction mechanism. Raman and XRD measurements have given strong evidence that CeO 2 nanoparticles have fluorite structure. EDS, FTIR and XPS results suggest almost complete exchange of TBA + and K + by Ce 4+ . Cerium ion exchange on the acid exchanged parent compound, H 2.9 K 1.1 Nb 6 O 17 , revealed that the extent of Ce ion exchange is much greater in case of nanosheets, which may be rationalized by the larger surface area available after exfoliation. XPS measurements show that the ratio of Ce 4+ /Ce 3+ is around 4.4, in agreement with the formation of fluorite structure (CeO 2 ). Thus, these CeO 2 nanoparticle/nanosheet composites may be useful for catalytic processes.",
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Marques, TMF, Strayer, ME, Ghosh, A, Silva, A, Ferreira, OP, Fujisawa, K, Alves da Cunha, JR, Abreu, GJP, Terrones Maldonado, M, Mallouk, TE & Viana, BC 2017, ' Homogeneously dispersed CeO 2 nanoparticles on exfoliated hexaniobate nanosheets ', Journal of Physics and Chemistry of Solids, vol. 111, pp. 335-342. https://doi.org/10.1016/j.jpcs.2017.08.027

Homogeneously dispersed CeO 2 nanoparticles on exfoliated hexaniobate nanosheets . / Marques, Thalles M.F.; Strayer, Megan E.; Ghosh, Anupama; Silva, Alexandre; Ferreira, Odair P.; Fujisawa, Kazunori; Alves da Cunha, Jose R.; Abreu, Guilherme J.P.; Terrones Maldonado, Mauricio; Mallouk, Thomas E.; Viana, Bartolomeu C.

In: Journal of Physics and Chemistry of Solids, Vol. 111, 01.12.2017, p. 335-342.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Homogeneously dispersed CeO 2 nanoparticles on exfoliated hexaniobate nanosheets

AU - Marques, Thalles M.F.

AU - Strayer, Megan E.

AU - Ghosh, Anupama

AU - Silva, Alexandre

AU - Ferreira, Odair P.

AU - Fujisawa, Kazunori

AU - Alves da Cunha, Jose R.

AU - Abreu, Guilherme J.P.

AU - Terrones Maldonado, Mauricio

AU - Mallouk, Thomas E.

AU - Viana, Bartolomeu C.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Hexaniobate nanosheets derived from the parent compound K 4 Nb 6 O 17 have been decorated with CeO 2 nanoparticles by ion exchange with aqueous cerium (IV) solution. Very homogeneous CeO 2 nanoparticle decoration of the hexaniobate sheets can be achieved by this method and the resulting composites may absorb visible light. HRTEM images show that ∼3.0 nm diameter CeO 2 nanoparticles adhere to hexaniobate nanosheets that are exfoliated and then restacked prior to Ce deposition. The interfacial interaction between CeO 2 nanoparticles and nanosheets would be due to an electrostatic attraction mechanism. Raman and XRD measurements have given strong evidence that CeO 2 nanoparticles have fluorite structure. EDS, FTIR and XPS results suggest almost complete exchange of TBA + and K + by Ce 4+ . Cerium ion exchange on the acid exchanged parent compound, H 2.9 K 1.1 Nb 6 O 17 , revealed that the extent of Ce ion exchange is much greater in case of nanosheets, which may be rationalized by the larger surface area available after exfoliation. XPS measurements show that the ratio of Ce 4+ /Ce 3+ is around 4.4, in agreement with the formation of fluorite structure (CeO 2 ). Thus, these CeO 2 nanoparticle/nanosheet composites may be useful for catalytic processes.

AB - Hexaniobate nanosheets derived from the parent compound K 4 Nb 6 O 17 have been decorated with CeO 2 nanoparticles by ion exchange with aqueous cerium (IV) solution. Very homogeneous CeO 2 nanoparticle decoration of the hexaniobate sheets can be achieved by this method and the resulting composites may absorb visible light. HRTEM images show that ∼3.0 nm diameter CeO 2 nanoparticles adhere to hexaniobate nanosheets that are exfoliated and then restacked prior to Ce deposition. The interfacial interaction between CeO 2 nanoparticles and nanosheets would be due to an electrostatic attraction mechanism. Raman and XRD measurements have given strong evidence that CeO 2 nanoparticles have fluorite structure. EDS, FTIR and XPS results suggest almost complete exchange of TBA + and K + by Ce 4+ . Cerium ion exchange on the acid exchanged parent compound, H 2.9 K 1.1 Nb 6 O 17 , revealed that the extent of Ce ion exchange is much greater in case of nanosheets, which may be rationalized by the larger surface area available after exfoliation. XPS measurements show that the ratio of Ce 4+ /Ce 3+ is around 4.4, in agreement with the formation of fluorite structure (CeO 2 ). Thus, these CeO 2 nanoparticle/nanosheet composites may be useful for catalytic processes.

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