Zinc oxalate nanorods: a convenient precursor to uniform nanoparticles of ZnO

Recebido em 28/07/2015; aceito em 22/12/2015; publicado na web em 11/03/2016ZnO and Ag-ZnO were synthesized in a simple and efficient manner by thermal decomposition of zinc oxalate and silver/zinc mixed oxalate. The influence of the addition of metallic silver on ZnO particles and the effect of temperature in the thermal treatment were investigated. The samples were characterized by thermogravimetric analysis, Raman, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, specific surface area (Brunauer-Emmett-Teller) and diffuse reflectance spectroscopy. The photocatalytic activity of these materials in the decolorization of direct red 23 diazo dye was studied. The complete conversion into oxides from oxalates at lower temperatures was determinant in the photocatalytic efficiency of both the oxides. The presence of silver in zinc oxide, treated at 400 °C, more than doubled the rate constant of diazo dye decolorization (6.87×10-3 min -1) with respect to ZnO, treated at 600 °C, resulting in 3.07×10 -3 min -1 under UV irradiation at 30 °C.

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“…Ahmad et al 18 verified similar behavior for the ZnO synthesis from ZnC 2 O 4 , whose uniform ZnO nanoparticles were found at 400 °C.…”

Section: Materials Characterizationmentioning

confidence: 57%

ZnO AND Ag-ZnO CRYSTALS: SYNTHESIS, CHARACTERIZATION, AND APPLICATION IN HETEROGENEOUS PHOTOCATALYSIS

et al. 2016

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“…The average size of the n-ZnO NPs obtained from the qint(volume/%) plot is about 90 nm and the size distribution is in the range of 60 nm-130 nm. It is known that the DLS technique averages out the dimensions in the form of an equivalent sphere [6]. The inset shows the SEM image of the n-ZnO NPs used in this study, which shows the size of the NPs.…”

Section: Methodsmentioning

confidence: 99%

A p-n Heterojunction Diode Constructed with A p-Si Nanowire and An n-ZnO Nanoparticle Thin-Film by Dielectrophoresis

Kim¹,

Lee²,

Yun³

et al. 2011

The Transactions of The Korean Institute of Electrical Engineer

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-Newly-developed fabrication of a p-n heterojunction diode constructed with a p-Si nanowire (NW) and an n-ZnO nanoparticle (NP) thin-film by the dielectrophoresis (DEP) technique is demonstrated in this study. With the bias of 20 Vp-p at the input frequency of 1 MHz, the most efficient assembly of the n-ZnO NPs is shown for the fabrication of the p-n heterojunction diode with a p-Si NW. The p-n heterojunction diode fabricated in this study represents current rectifying characteristics with the turn on voltage of 1.1 V. The diode can be applied to the fabrication of optoelectrical devices such as photodetectors, light-emitting diodes (LEDs), or solar cells based on the high conductivity of the NW and the high surface to volume ratio of the NP thin film.

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“…Various types of materials, viz., dielectric [1][2][3] , magnetic 4,5 , and optical 6 , have been synthesised using the reverse micellar route. In addition, nanorods of a variety of transition metal oxalates 4,6,7 have been successfully obtained.…”

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis of Nanomaterials using Reverse Micelles

Vaidya¹,

Ahmed²,

Ganguli³

2008

DSJ

Self Cite

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Monophasic nanosized oxides were synthesised mainly from metal oxalate nanorods obtained using the reverse micellar method. This paper focuses on the methodology to obtain important metal oxides like tin dioxide, cerium oxide (CeO 2 ), zirconia, and zinc oxide. The effect of oxidation state of the metal ion on the morphology of the oxalates was studied. Nanorods of zinc (II) oxalate (120 nm in dia and 600 nm in length) were obtained while spherical particles of size 4 6 nm were obtained for cerium (III) oxalate. The decomposition of these precursors at higher temperature led to the formation of their respective oxides. Mixture of nanorods and nanoparticles of CeO 2 was obtained while 34 nm sized ZrO 2 nanoparticles were obtained by thermal decomposition of zirconium oxalate precursor. The dielectric constant and loss were highly stable with frequency (at room temperature) for both ceria and zirconia nanoparticles. ZnO nanoparticles (55 nm sized) were obtained by the decomposition of zinc oxalate nanorods. Three peaks corresponding to free excitonic emission, free-to-bound, and donor-acceptor transitions were observed in the photoluminescence studies at 20 K for ZnO nanoparticles.

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Zinc oxalate nanorods: a convenient precursor to uniform nanoparticles of ZnO

Cited by 86 publications

References 54 publications

ZnO AND Ag-ZnO CRYSTALS: SYNTHESIS, CHARACTERIZATION, AND APPLICATION IN HETEROGENEOUS PHOTOCATALYSIS

ZnO AND Ag-ZnO CRYSTALS: SYNTHESIS, CHARACTERIZATION, AND APPLICATION IN HETEROGENEOUS PHOTOCATALYSIS

A p-n Heterojunction Diode Constructed with A p-Si Nanowire and An n-ZnO Nanoparticle Thin-Film by Dielectrophoresis

Controlled Synthesis of Nanomaterials using Reverse Micelles

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