Preparation and band gap energies of ZnO nanotubes, nanorods and spherical nanostructures

Rusdi, Roshidah; Rahman, Azilah Abd; Mohamed, N. S.; Kamarudin, Norashikin; Kamarulzaman, Norlıda

doi:10.1016/j.powtec.2011.02.005

Cited by 134 publications

(75 citation statements)

References 23 publications

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“…17 The use of materials with UV-protection properties is typically based on optical scattering and/or absorption. 18 On the other hand, the UV-blocking ability of nanoscale ZnO also depends on its size and morphology. Therefore, ZnO nanoparticles with different sizes and morphologies have different UV-blocking properties.…”

Section: Introductionmentioning

confidence: 99%

Impact of nanostructured thin ZnO film in ultraviolet protection

Ghamsari

Alamdari

Han

et al. 2016

IJN

121

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Section: Introductionmentioning

confidence: 99%

Impact of nanostructured thin ZnO film in ultraviolet protection

Ghamsari

Alamdari

Han

et al. 2016

IJN

121

View full text Add to dashboard Cite

“…The E u profiles for the ZnO nanorod samples are presented in Figure 7. These values correlate with the optical transitions between localized states adjacent to the valence and conduction bands' extended state (Rusdi et al, 2011;Mote et al, 2012). The optical properties of the samples in the forms of E g and E u are summarized in Table 3.…”

Section: Optical Analysismentioning

confidence: 89%

Effect of Post‐Hydrothermal Treatments on the Physical Properties of ZnO Layer Derived from Chemical Bath Deposition

Sholehah¹,

Yuwono²,

Sofyan³

et al. 2017

IJTech

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Among semiconductors, zinc oxide (ZnO) has received great attention due to its wide band-gap and high electron mobility, resulting in various strategic applications. Controlling the physical properties of ZnO is therefore a critical issue in the fabrication of related electronic and optical devices. In this study, ZnO nanorods layers were grown on an ITO glass substrate via chemical bath deposition at low temperature. Prior to the growing process, the layers were deposited using a spin-coating technique. The seeding solution was made by dissolving zinc nitrate tetrahydrate and hexamethylene tetraamine in cold water (0 o C) for an hour using a cooler bath. The as-synthesized ZnOs were further subjected to different post-hydrothermal treatment series at a temperature of 150 o C for three hours at atmospheric pressure and at 100°C for one hour under one bar of nitrogen gas (N 2 ) pressure. The characterization was performed using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and UV-Vis spectroscopy. The SEM results showed that the ZnO nanorods were grown as a vertically aligned hexagonal structure, while the XRD patterns showed a high intensity at the (002) plane. On the basis of investigation, it was found that under post-hydrothermal treatment at 150 o C for three hours with atmospheric pressure, the synthesis procedure resulted in nanostructures in the form of ZnO rods. Meanwhile, post-hydrothermal treatment at 100°C for one hour under one bar of nitrogen gas (N 2 ) produced ZnO rods and tubes. In general, the posthydrothermal process provided a high degree of crystallinity. The optimum ZnO layer was obtained after post-hydrothermal treatment at 150 o C for three hours at atmospheric pressure, with a crystallite size and band-gap energy of ~18 nm and 3.20 eV, respectively.

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“…24 This means that there was a decrease of the band gap energy as presented in Table 2. This behavior was observed as for ZnO as for Ag-ZnO, which can be related to the crystallization process.…”

Section: Figure 4 Xrd Patterns Of (A) Synthesized Mixed Oxalate (Zncmentioning

confidence: 92%

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

et al. 2016

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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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Preparation and band gap energies of ZnO nanotubes, nanorods and spherical nanostructures

Cited by 134 publications

References 23 publications

Impact of nanostructured thin ZnO film in ultraviolet protection

Impact of nanostructured thin ZnO film in ultraviolet protection

Effect of Post‐Hydrothermal Treatments on the Physical Properties of ZnO Layer Derived from Chemical Bath Deposition

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

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