Formation and field emission property of single-crystalline Zn microtip arrays by anodization

Kuan, Chi-Yun; Chou, Jaw-Min; Leu, Ing‐Chi; Hon, Min–Hsiung

doi:10.1016/j.elecom.2007.06.004

Cited by 22 publications

(21 citation statements)

References 17 publications

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“…1(a) exhibits its single-crystalline nature and the f0110g spots from facets. Detailed analysis of the formation of single-crystalline Zn microtips has been reported [6]. Zinc is a volatile element and inclines to react with oxygen and forms oxide when exposed to oxygen or air.…”

Section: Resultsmentioning

confidence: 99%

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Sixfold self-assembled hierarchical structures synthesized by direct annealing of Zn microtips

Kuan

Chou

Leu

et al. 2008

Journal of Solid State Chemistry

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Section: Resultsmentioning

confidence: 99%

“…The single-crystalline Zn pyramid microstructures were prepared by anodic etching on electrolpolished polycrystalline Zn foil, which was conducted in NH 4 Cl/H 2 O 2 (molar ratio NH 4 Cl/H 2 O 2 ¼ 32) solution using a constant current density 55 mA/cm 2 for 60 s [6]. Then, the single-crystalline Zn pyramids were kept at 375 1C for 12 h in air.…”

Section: Methodsmentioning

confidence: 99%

Sixfold self-assembled hierarchical structures synthesized by direct annealing of Zn microtips

Kuan

Chou

Leu

et al. 2008

Journal of Solid State Chemistry

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“…The single-crystalline Zn pyramid microstructures, i.e., microtips, were then prepared by anodic etching on polycrystalline Zn foil. 6 Aqueous chemical growth solution was composed of 0.5M Zn(NO 3 ) 2 и6H 2 O and 4.0M KOH (volume ratio 1:1). The hierarchical structures thus obtained were characterized by a field emission scanning electron microscopy (FE-SEM; JSM-7000F, JEOL, Tokyo, Japan), and the structural characteristics were studied by transmission electron microscopy [TEM; field emission gun (FEG)-TEM, Tecnai F20 G2 MAT, FEI].…”

Section: Methodsmentioning

confidence: 99%

Self-organized Zn/ZnO core-shelled hierarchical structures prepared by aqueous chemical growth

et al. 2008

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Self-assembled core-shelled hierarchical structures consisting of single-crystalline pyramid Zn microtip as a core, converted ZnO coating as the shell, and the grown ZnO nanowires as branches, have been prepared. Such ZnO hierarchical structures fabricated by a simple aqueous chemical growth method on Zn foil substrate are expected to be easily integrated into nanodevices. These self-organized structures are superior to both the random nanoarchitecture arrays formed in vapor system and the precipitated nanostructures suspended in the solution. Because of the easier transportation of electrons from the metallic core to ZnO branches, the self-assembled core-shelled hierarchical structures exhibit better field-emission characteristics.

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“…1b, 1c and 1d show that the smaller concentration of hydrogen ion, the more regular ZnO nanoparticles. It can be explained by this reaction as follows [16,19] Reaction (1) can aggravate the dissolution of ZnO nanoparticles, as disk-like nanoparticles presented in Fig. 1c and Fig.…”

Section: Feature Of Anodic Zinc Oxidementioning

confidence: 99%

Fabrication of ZnO Nanoparticles for Photocatalytic Reduction of CO₂

Chen

Liu

et al. 2016

MATEC Web Conf.

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Abstract. ZnO nanoparticles were fabricated by anodization method. Different fabrication conditions, including pH buffers (sodium hydroxide, citric acid, oxalic acid, hydrogen peroxide), electrolyte concentration, temperature and voltage were investigated. The field emission scanning electron microscopes (FESEMs) revealed that zinc oxide nanoparticles with discal morphology were formed. The optimum conditions for fabrication of nano ZnO material with discal shape nanoparticles are 1wt% NH 4 F electrolyte in water ethano(1:1) solution at 25 o C and 40v with 0.2M citric acid as pH buffer. This ZnO material shows rather high photocatalytic reduction activity of CO 2 and the yield of CH 4 reaches 2.48 umol/g catalyst. Keywords: Zinc oxide nanoparticles, discal morphology, preparation conditions, photocatalytic reduction 1Introduction Zinc oxide has drawn considerable attention because of its attractive optical-electrical characteristics [1,2] that make it potentially applicable in a lot of fields such as ultraviolet lasing [3], photocatalysts [4]and so on [5,6]. In addition, 1D nanoscale ZnO is preferred in photoanode applications due to its larger surface area [7].Anodic oxidation has been employed in synthesis of many kinds of metal oxides with 1D nanostructure [8~10]. Research on anodization of various valve metals by P. Schmuki group [11~14] showed that anodizing can be applied to the preparation of nanostructures of other valve metals. Anodization of Znthat is one of the valve metals especially synthesis of 1D nanoscale of ZnO by anodizing has been widely investigated, since its gentle conditions and cheap equipment. S. Sreekantan et al. [7] have reported that nanoneedle, nanoflower and nanoflake of ZnO can be obtained by anodization in different concentration of sodium hydroxide. Apiked ZnO nanowire structures [15] are achieved by changing the NH 4 F concentration. Studies on the preparation of ZnO strips have been conducted by Sung Joong Kim et al [16].Although many researches have concentrated on 1D nanoscale ZnO, research of various nanostructures in this field is still at primary stage. Hence, the new morphology and application of ZnO nanoparticle is yet to be further found. The key to nanostructure of ZnO

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Formation and field emission property of single-crystalline Zn microtip arrays by anodization

Cited by 22 publications

References 17 publications

Sixfold self-assembled hierarchical structures synthesized by direct annealing of Zn microtips

Sixfold self-assembled hierarchical structures synthesized by direct annealing of Zn microtips

Self-organized Zn/ZnO core-shelled hierarchical structures prepared by aqueous chemical growth

Fabrication of ZnO Nanoparticles for Photocatalytic Reduction of CO₂

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Formation and field emission property of single-crystalline Zn microtip arrays by anodization

Cited by 22 publications

References 17 publications

Sixfold self-assembled hierarchical structures synthesized by direct annealing of Zn microtips

Sixfold self-assembled hierarchical structures synthesized by direct annealing of Zn microtips

Self-organized Zn/ZnO core-shelled hierarchical structures prepared by aqueous chemical growth

Fabrication of ZnO Nanoparticles for Photocatalytic Reduction of CO2

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Fabrication of ZnO Nanoparticles for Photocatalytic Reduction of CO₂