Electrodeposition and characterization of Mo oxide nanostructures

Rosalinda Inguanta, Carmelo Sunseri, Tiziana Spano', Salvatore Piazza, Francesco Barrec, Letteria Silipigni, Fortunato Neri, Enza Fazio

Risultato della ricerca: Article

5 Citazioni (Scopus)

Abstract

Template electrodeposition has been used to grow uniform arrays of molybdenum oxide nanostructures in polycarbonate membrane. Several parameters have been investigated, like electrodeposition, time and solution pH. These parameters do not influence the nature of the deposit that always consists of mixed valence molybdenum oxides, whereas the nanostructure morphology changes with pH. In particular, at low pH (2.7), nanotubes are formed, whilst arrays of nanowires are obtained above pH 5.5. This change of morphology is likely due to H2 bubbles evolution during the electrochemical deposition, particularly occurring at low pH. It was found that fast removal of H2 bubbles through vigorous stirring of the solution favors the growth of nanostructures with a uniform length. Molybdenum oxide nanostructures were characterized by XRD, EDS, Raman, XPS and photoelectrochemical measurements. Results indicate that nanostructures are amorphous and consist mainly of MoO2 underneath á-MoO3. The presence of these two oxides was confirmed by photoelectrochemical experiments. From photocurrent spectra, two linear regions appear in the (Iph·h?)0.5 vs. hí plot, whose extrapolation to Iph=0 gives optical gaps values of 2.5 and 3.2 eV, which are typical of MoO2 and á-MoO3, respectively. In addition, photoelectrochemical investigation revealed n-type conductivity of this mixed oxide deposit. Copyright © 2015, AIDIC Servizi S.r.l.
Lingua originaleEnglish
pagine (da-a)685-690
Numero di pagine6
RivistaDefault journal
Volume43
Stato di pubblicazionePublished - 2015

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Electrodeposition
Oxides
Nanostructures
Molybdenum oxide
polycarbonate
Deposits
Polycarbonates
Bubbles (in fluids)
Photocurrents
Extrapolation
Nanotubes
Nanowires
Energy dispersive spectroscopy
X ray photoelectron spectroscopy
Membranes
Experiments
molybdenum dioxide
molybdenum trioxide

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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Electrodeposition and characterization of Mo oxide nanostructures. / Inguanta, Rosalinda; Sunseri, Carmelo; Spano', Tiziana; Piazza, Salvatore; Barrec, Francesco; Silipigni, Letteria; Neri, Fortunato; Fazio, Enza.

In: Default journal, Vol. 43, 2015, pag. 685-690.

Risultato della ricerca: Article

Inguanta, Rosalinda ; Sunseri, Carmelo ; Spano', Tiziana ; Piazza, Salvatore ; Barrec, Francesco ; Silipigni, Letteria ; Neri, Fortunato ; Fazio, Enza. / Electrodeposition and characterization of Mo oxide nanostructures. In: Default journal. 2015 ; Vol. 43. pagg. 685-690.
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abstract = "Template electrodeposition has been used to grow uniform arrays of molybdenum oxide nanostructures in polycarbonate membrane. Several parameters have been investigated, like electrodeposition, time and solution pH. These parameters do not influence the nature of the deposit that always consists of mixed valence molybdenum oxides, whereas the nanostructure morphology changes with pH. In particular, at low pH (2.7), nanotubes are formed, whilst arrays of nanowires are obtained above pH 5.5. This change of morphology is likely due to H2 bubbles evolution during the electrochemical deposition, particularly occurring at low pH. It was found that fast removal of H2 bubbles through vigorous stirring of the solution favors the growth of nanostructures with a uniform length. Molybdenum oxide nanostructures were characterized by XRD, EDS, Raman, XPS and photoelectrochemical measurements. Results indicate that nanostructures are amorphous and consist mainly of MoO2 underneath {\'a}-MoO3. The presence of these two oxides was confirmed by photoelectrochemical experiments. From photocurrent spectra, two linear regions appear in the (Iph·h?)0.5 vs. h{\'i} plot, whose extrapolation to Iph=0 gives optical gaps values of 2.5 and 3.2 eV, which are typical of MoO2 and {\'a}-MoO3, respectively. In addition, photoelectrochemical investigation revealed n-type conductivity of this mixed oxide deposit. Copyright {\circledC} 2015, AIDIC Servizi S.r.l.",
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AU - Inguanta, Rosalinda

AU - Sunseri, Carmelo

AU - Spano', Tiziana

AU - Piazza, Salvatore

AU - Barrec, Francesco

AU - Silipigni, Letteria

AU - Neri, Fortunato

AU - Fazio, Enza

PY - 2015

Y1 - 2015

N2 - Template electrodeposition has been used to grow uniform arrays of molybdenum oxide nanostructures in polycarbonate membrane. Several parameters have been investigated, like electrodeposition, time and solution pH. These parameters do not influence the nature of the deposit that always consists of mixed valence molybdenum oxides, whereas the nanostructure morphology changes with pH. In particular, at low pH (2.7), nanotubes are formed, whilst arrays of nanowires are obtained above pH 5.5. This change of morphology is likely due to H2 bubbles evolution during the electrochemical deposition, particularly occurring at low pH. It was found that fast removal of H2 bubbles through vigorous stirring of the solution favors the growth of nanostructures with a uniform length. Molybdenum oxide nanostructures were characterized by XRD, EDS, Raman, XPS and photoelectrochemical measurements. Results indicate that nanostructures are amorphous and consist mainly of MoO2 underneath á-MoO3. The presence of these two oxides was confirmed by photoelectrochemical experiments. From photocurrent spectra, two linear regions appear in the (Iph·h?)0.5 vs. hí plot, whose extrapolation to Iph=0 gives optical gaps values of 2.5 and 3.2 eV, which are typical of MoO2 and á-MoO3, respectively. In addition, photoelectrochemical investigation revealed n-type conductivity of this mixed oxide deposit. Copyright © 2015, AIDIC Servizi S.r.l.

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