Microwave Assisted Synthesis of ZnO Tridimensional Nanostructures

Barreto, Gastón P.; Morales, Graciela; Cañizo, Adriana I.; Eyler, Nora

doi:10.1016/j.mspro.2015.04.106

Cited by 11 publications

(6 citation statements)

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“…Conforme a análise dos resultados confirmou-se o tipo de estrutura wurtzita pela fase hexagonal do óxido de zinco [2,11,[25][26][27][28]. Sendo confirmado, conforme [4], fortes picos de difração aparecendo em 2θ = 31.8°,34.3° e 36.5°, correspondendo aos planos (100), (002) e (101).…”

Section: Resultados E Discussõesunclassified

“…O óxido de zinco é reconhecido como uma material fotocatalítico que possui uma grande fotosensitividade [3], baixo custo, viabilidade e disponibilidade para produção. Considerado um semicondutor do grupo II-IV [4], com um amplo band gap (3,37 eV) e grande energia de ligação (Eg = 60meV) [1,[3][4][5][6][7][8][9][10][11].…”

Section: Introductionunclassified

“…A síntese e dopagem do óxido de zinco de zinco pode ser realizada por diversos métodos não somente o método hidrotermal assistido por microondas [4,6,9,13], mas também por síntese eletroquímica [14], solvotermal [15], sonoquimica [16], deposição de vapor [17], co-preciptação [18], wet chemical [19], microemulsão [20] e sol-gel [21].…”

Section: Introductionunclassified

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Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

2018

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____________________________________________________________________________________________________________ RESUMOO óxido de zinco devido à presença de defeitos intrínsecos possibilita a dopagem com outros materiais, como o bismuto. O BZO (óxido de zinco dopado com bismuto) preparado via síntese hidrotermal assistida por microondas (MAHS) foi estudado por sua concentração de dopante e caracterização morfológica. Os produtos foram caracterizados DRX, MEV e PL; Cálculos de banda gap por espectroscopia de transmissão. Os resultados indicam que as nanoestruturas de BZO foram obtidas com tamanhos de cristalitos variando de 5,82 a 8,37 nm. A mesma estrutura morfológica, tipo flor, foi formada com diferentes concentrações de dopantes. PL demonstra que os defeitos aumentam com a dopagem do bismuto. O intervalo de band gap encontrado foi de 2,79-3,3 eV e tem potencial uso em aplicações de fotodegradação.

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Section: Resultados E Discussõesunclassified

Section: Introductionunclassified

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Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

2018

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“… Examples of various ZnO structures obtained by the microwave hydrothermal synthesis: ( a ) SEM image of ZnO hexagonal columns; ( b ) SEM image of ZnO cauliflower-like morphology. (( a , b ) Reprinted from [ 598 ], Copyright ©2015 The Authors, with permission from Elsevier [OR APPLICABLE SOCIETY COPYRIGHT OWNER]. Article licensed under a CC BY-NC-ND 4.0, ); ( c – e ) SEM images of ZnO rods (Reprinted from [ 599 ], Copyright ©2015 The Authors, with permission from Elsevier [OR APPLICABLE SOCIETY COPYRIGHT OWNER].…”

Section: Figurementioning

confidence: 99%

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

2020

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Zinc oxide (ZnO) is a multifunctional material due to its exceptional physicochemical properties and broad usefulness. The special properties resulting from the reduction of the material size from the macro scale to the nano scale has made the application of ZnO nanomaterials (ZnO NMs) more popular in numerous consumer products. In recent years, particular attention has been drawn to the development of various methods of ZnO NMs synthesis, which above all meet the requirements of the green chemistry approach. The application of the microwave heating technology when obtaining ZnO NMs enables the development of new methods of syntheses, which are characterised by, among others, the possibility to control the properties, repeatability, reproducibility, short synthesis duration, low price, purity, and fulfilment of the eco-friendly approach criterion. The dynamic development of materials engineering is the reason why it is necessary to obtain ZnO NMs with strictly defined properties. The present review aims to discuss the state of the art regarding the microwave synthesis of undoped and doped ZnO NMs. The first part of the review presents the properties of ZnO and new applications of ZnO NMs. Subsequently, the properties of microwave heating are discussed and compared with conventional heating and areas of application are presented. The final part of the paper presents reactants, parameters of processes, and the morphology of products, with a division of the microwave synthesis of ZnO NMs into three primary groups, namely hydrothermal, solvothermal, and hybrid methods.

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“…Microwave solvothermal synthesis (MSS) has not been used for obtaining Zn (1−x−y) Mn x Co y O NPs yet. Microwave technology is successfully applied for obtaining nanomaterials [119][120][121][122][123][124][125][126][127][128][129], including diverse nanostructures of ZnO [130][131][132][133][134][135][136][137][138][139][140][141][142]. The increased popularity of microwave-driven syntheses mainly arises from the decreasing prices of microwave reactors and the emergence of new reactor designs [143][144][145][146][147].…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Co‒Mn Codoped ZnO Nanoparticles Obtained by Microwave Solvothermal Synthesis

et al. 2018

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Zinc oxide nanoparticles codoped with Co2+ and Mn2+ ions (Zn(1−x−y)MnxCoyO NPs) were obtained for the first time by microwave solvothermal synthesis. The nominal content of Co2+ and Mn2+ in Zn(1−x−y)MnxCoyO NPs was x = y = 0, 1, 5, 10 and 15 mol % (the amount of both ions was equal). The precursors were obtained by dissolving zinc acetate dihydrate, manganese (II) acetate tetrahydrate and cobalt (II) acetate tetrahydrate in ethylene glycol. The morphology, phase purity, lattice parameters, dopants content, skeleton density, specific surface area, average particle size, average crystallite size, crystallite size distribution and magnetic properties of NPs were determined. The real content of dopants was up to 25.0% for Mn2+ and 80.5% for Co2+ of the nominal content. The colour of the samples changed from white to dark olive green in line with the increasing doping level. Uniform spherical NPs with wurtzite structure were obtained. The average size of NPs decreased from 29 nm to 21 nm in line with the increase in the dopant content. Brillouin type paramagnetism and an antiferromagnetic interaction between the magnetic ions was found for all samples, except for that with 15 mol % doping level, where a small ferromagnetic contribution was found. A review of the preparation methods of Co2+ and Mn2+ codoped ZnO is presented.

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Microwave Assisted Synthesis of ZnO Tridimensional Nanostructures

Cited by 11 publications

References 11 publications

Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

Structural and Magnetic Properties of Co‒Mn Codoped ZnO Nanoparticles Obtained by Microwave Solvothermal Synthesis

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