Growth of ZnO nanorod arrays by sol–gel method: transition from two-dimensional film to one-dimensional nanostructure

Zhu, Mingwei; Huang, Nan; Gong, Jun; Zhang, B.; Wang, Z. J.; Sun, Cai; Jiang, Xin

doi:10.1007/s00339-010-6041-1

Cited by 23 publications

(10 citation statements)

References 25 publications

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“…With an increase in the zirconia content in the samples, the crystallinity also increased. It is suggested that dopants introduce more defects, and newer nucleation centers are created and promote the nucleation process . Researchers have suggested that the removal of calcium ions from HA involves an ion exchange reaction with ZrO 2+ ion .…”

Section: Discussionmentioning

confidence: 99%

“…Practically, all of the theoretical work on catalytic growth has been related to the vapor–liquid–solid (VLS) mechanism . Owing to the different condition between the VLS and sol–gel processes, the growth of nanowires with the sol–gel method cannot be explained by the VLS process, even though a similar phenomenon is observed during the growth process of the nanowires …”

Section: Discussionmentioning

confidence: 99%

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Effect of Zirconia Concentration on the Growth of Nanowires in Bioactive Glass–Ceramic Coatings

Rabiee

Azizian

2012

Int J Applied Ceramic Tech

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Bioactive glass-ceramic with various zirconia concentrations was applied on stainless steel (SS) by the sol-gel method. Bioactive glass powder was prepared by the sol-gel method, and thermal properties of the prepared powders were studied by differential thermal analysis (DTA). The effects of zirconia were investigated to explore the growth of nanowires. The growth model of nanowires, in this study, is proposed in terms of the surface diffusion. The coatings showed the hardness values to be in the range of 3000-4500 MPa. The hardness values of prepared composite coatings increased with an increase in zirconia amounts.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Zirconia Concentration on the Growth of Nanowires in Bioactive Glass–Ceramic Coatings

Rabiee

Azizian

2012

Int J Applied Ceramic Tech

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“…In sol-gel, molecular precursors are transformed on a stable condensed oxide network through multiple stages -in the first step, the formation of a stable sol precursor through hydrolysis and polymerization occurs, followed by condensation through dehydration, nucleation and growth. The highest temperature throughout the synthesis process occurs at the annealing process needed for the growth stage; for ZnO, an annealing temperature as low as 150°C has been reported 30 .…”

Section: Sol-gelmentioning

confidence: 99%

“…During these stages, nucleation centers are formed within a homogeneous pseudo-polymeric net, and they remain evenly dispersed therein, with no evident mechanism capable of imposing anisotropic growth along any given crystalline direction. However, some reports on ZnO nanorod growth through sol-gel can be found in the literature 30,31 , albeit this was achieved during the annealing stage of initially fabricated ZnO thin films through a mechanism that involved surface diffusion of Zn atoms in a solid-solid process 30 . When growing from solution, the fabrication of ZnO NWs and nanotubes using alumina templates has been reported 32 , however this technique is complicated due to the high viscosity of colloids used in the sol-gel technique, which hinders their penetration into template pores.…”

Section: Sol-gelmentioning

confidence: 99%

ZnO Nanostructures Synthesized by Vapor Transport and Liquid Phase Synthesis Techniques: Growth and Properties

et al. 2020

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In this review, we briefly describe work devoted in recent years towards the effective control of morphology, structure and optical properties of ZnO nanostructures, with particular focus on cost effective and simple methods for ZnO nanowires (NWs) fabrication. For the vapor transport technique, we describe in detail mechanisms for growth precursors generation, their transport in inert and forming gas, as well as their reactions on different pretreated substrates and corresponding growth mechanisms. As for low temperature synthesis methods, three techniques are outlined: sol-gel, solvothermal and electrophoretic deposition, with emphasis on effective morphology, structure and optical properties control. In this context, we discuss recent attempts to understand the role of solvent and alkaline agents used during solvothermal synthesis of ZnO nanostructures on their morphology and photoluminescence properties. Recent success of electrophoretic deposition of ZnO nanoparticles on pre-patterned silicon substrates in the form of NWs and NW bunches is highlighted over many previous attempts to fabricate ZnO NWs with inconvenient sacrificial templates. Finally, we present a critical discussion on the current understanding of passivation mechanisms of ZnO NW surfaces by MgO shells.

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“…By exploiting the peculiarities of crystal structure one can effectively control the morphology of ZnO nanostructures in the fabrication process [13]. Diverse morphologies of ZnO nanostructures such as nanorods, nanowires, nanosheets, nanocombs and nanoribbons have been synthesized by different physical and chemical fabrication techniques.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnO Layers on Transport and Relaxation of Charge in Porous Silicon–Silicon Structures

Olenych¹

2016

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Zinc oxide nanostructures have been grown by electrochemical deposition on porous silicon-silicon substrate. The effect of electrolyte temperature on the morphology of grown ZnO arrays was observed. Temperature dependencies of the electrical conductivity for the structures based on porous silicon were investigated in 80-325 K range. The results are analyzed within the model of disordered semiconductors and the activation energy of charge transport is determined. It is shown that ZnO layers cause the decrease of the electrical conductivity activation energy in 140-250 К temperature range. Electric conductivity was also shown to be dependent on the morphology of ZnO arrays. Based on the spectra of thermally stimulated depolarization current, the localized electron states in the experimental samples are found. The trap levels are distributed quasi-continuously on the activation energy and exist in the ranges of 0.2-0.3, 0.4-0.45, 0.5-0.55 and 0.6-0.65 eV. ZnO nanocrystals grown on porous silicon substrates modify density of states in different energy ranges.

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Growth of ZnO nanorod arrays by sol–gel method: transition from two-dimensional film to one-dimensional nanostructure

Cited by 23 publications

References 25 publications

Effect of Zirconia Concentration on the Growth of Nanowires in Bioactive Glass–Ceramic Coatings

Effect of Zirconia Concentration on the Growth of Nanowires in Bioactive Glass–Ceramic Coatings

ZnO Nanostructures Synthesized by Vapor Transport and Liquid Phase Synthesis Techniques: Growth and Properties

Effect of ZnO Layers on Transport and Relaxation of Charge in Porous Silicon–Silicon Structures

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