ZnO architectures synthesized by a microwave-assisted hydrothermal method and their photoluminescence properties

Moura, A. P. de; Lima, Ronaldo Cintra; Moreira, Mário L.; Volanti, Diogo P.; Espinosa, J. W. M.; Orlandi, Marcelo Ornaghi; Pizani, P. S.; Varela, José Arana; Longo, Elson

doi:10.1016/j.ssi.2010.03.013

Cited by 95 publications

(59 citation statements)

References 55 publications

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“…The emission band prole is typical of a multiphonon process, where relaxation occurs by several paths which involve the participation of numerous states within the band gap of the material. 19,22,23 Furthermore, doping of the ZnO nanocrystals with different elements enables an adjustment of their optical properties in a wide-range of the electromagnetic spectrum.…”

Section: -50mentioning

confidence: 99%

“…The results indicate the relationship between the broad PL band and the degree of order-disorder in ZnO nanocrystals and are in agreement with other studies. 22,23,[60][61][62][63]67,68 A few years ago, we proposed a cluster model to explain complex metal oxide PL emissions of perovskite and scheelitebased materials. [73][74][75][76] In this model, the clusters are used as basic units of the materials to explain the structural and electronic order-disorder effects as well as their physical properties.…”

Section: -66mentioning

confidence: 99%

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Correlation between structural and electronic order–disorder effects and optical properties in ZnO nanocrystals

et al. 2014

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The correlation between structural and electronic order-disorder effects in understanding the optical properties of flower-like ZnO nanocrystals synthesized by the microwave-assisted hydrothermal method at low temperatures and short times is discussed. Theoretical simulations were performed at the density functional theory level to gain a better understanding of the experimental data from X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), electron paramagnetic resonance (EPR), ultraviolet-visible diffuse reflectance (UV-vis) spectroscopy and photoluminescence (PL) measurement studies at different temperatures. The decrease in band gap values is due to the presence of intermediate states above the conduction band. These discrete levels are formed by structural and electronic disorder of tetrahedral [ZnO 4 ] clusters which enhance the electron-hole pair.

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Section: -50mentioning

confidence: 99%

Section: -66mentioning

confidence: 99%

Correlation between structural and electronic order–disorder effects and optical properties in ZnO nanocrystals

et al. 2014

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“…Therefore, many efforts have been made to synthesize ZnO-based semiconductors with different morphologies for specific devices, such as nanorods, nanobelts, nanosheets, microrod/microtube arrays, quantum dots and other complex hierarchical micro/nanostructures [7,8]. Synthetic routes to ZnO nanoparticles include modified polymeric precursor (MPP) [9], sputtering [10,11], hydrothermal [12], solvothermal [13,14], sol-gel [15,16], ultrasonic irradiation [17], microwave-assisted hydrothermal (MAH) [6,18,19], and zinc-precursor thermal decomposition with free-solvent [20,21] methods. The MPP method is one of the most common chemical synthesis of inorganic semiconductor materials due to its simplicity and low cost.…”

Section: Introductionmentioning

confidence: 99%

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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Photocatalytic materials can perform oxidative and reductive reactions over their surfaces when excited with light. Intrinsic characteristics of the material such as superficial area, morphological structure, and crystalline phase exposition play a fundamental role in the corresponding reaction paths. However, especially in doped semiconductors, as ZnO:N, less is known about how the synthesis parameters affect the morphologies and the photocatalytic activity simultaneously. To solve this issue, ZnO and ZnO:N samples were obtained using microwave-assisted hydrothermal and modified polymeric precursor methods of synthesis. Samples morphologies were characterized by TEM and FE-SEM. Crystallographic phases were observed by XRD and optical characteristics by DRS. XPS results confirmed the doping process. Degradation of Rhodamine-B and Cr(VI) reduction were employed as probe reactions to investigate their photocatalytic activity. Although the crystallographic structure of these powders maintains the ZnO hexagonal wurtzite structure, the optical properties and morphologies, and photocatalytic activities present different behaviors. Also, density functional theory calculations were employed to determine the specific features related to electronic structure, morphology, and photocatalytic activity.Different synthesis methods produce a singular behavior in the physicochemical properties of materials, and the doping effect produces various modifications in RhB degradation and Cr(VI) reduction for each synthesis method. Crystal face exposition and morphologies are related to the improvement in the photocatalytic activity of the materials.

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“…It was revealed that concentration of precursors and irradiation power displayed significant influences on the compaction and dimensions of the grown nanorods. The 1D ZnO nanostructures and microstructures with a hexagonal crosssection growing in the (0002) direction were obtained under H-MW method (MW 2.45 GHz) at 130 o C for 30 min (de Moura et al, 2010). In addition, the intriguing results were reported for a facile H-MW route employing the reaction of Zn(NO3)2 · 6H2O and NaOH to synthesize a single-crystal zinc oxide 1D nanostructure with a 3D morphology (Fig.…”

Section: Microwave Hydrothermal and Solvothermal Processing Of Materimentioning

confidence: 96%

Microwave Hydrothermal and Solvothermal Processing of Materials and Compounds

Kharisov¹,

Kharissova²,

Méndez³

2012

The Development and Application of Microwave Heating

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ZnO architectures synthesized by a microwave-assisted hydrothermal method and their photoluminescence properties

Cited by 95 publications

References 55 publications

Correlation between structural and electronic order–disorder effects and optical properties in ZnO nanocrystals

Correlation between structural and electronic order–disorder effects and optical properties in ZnO nanocrystals

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

Microwave Hydrothermal and Solvothermal Processing of Materials and Compounds

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