Growth and formation mechanism of c-oriented ZnO nanorod arrays deposited on glass

Zhang, Hongzhou; Sun, Xiaoxiao; Wang, Rongming; Yu, Dapeng

doi:10.1016/j.jcrysgro.2004.05.078

Cited by 96 publications

(52 citation statements)

References 22 publications

(15 reference statements)

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“…It indicates that the prepared ZnO nanorods are highly aligned perpendicular to the ITO substrate with a c-oriented growth direction. The degree of the orientation can be illustrated by the relative texture coefficient, using the equation (5) [24,25]: Considering that the lengths of ZnO nanorods are very similar in these samples, the intensity difference in the diffraction peaks from ZnO nanorods can be attributed to the difference density of nanorods. Moreover, the density of ZnO nanorods is strongly dependent on the growth condition.…”

Section: Resultsmentioning

confidence: 99%

Effect of growth temperature on the structure and optical properties of ZnO nanorod arrays grown on ITO substrate

Zhang

Ruan

Liu

et al. 2013

Crystal Research and Technology

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ZnO nanorod arrays have been successfully prepared on ITO substrate by a chemical-bath deposition method at different growth temperatures. The influence of the growth temperature on the morphology and microstructure of the ZnO nanorods was investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the diameter of the ZnO nanorods decreased and the size of the nanocrystals increased with increasing growth temperature. Optical absorption measurements showed the absorption band edge has shifted to a lower-energy region due to the quantum size effect. Green emission and UV emission bands were observed and they are found to be temperature dependent, which indicates that the deep-level emission and band-edge emission of ZnO nanorods is closely related to the rod diameter, and the related mechanism is discussed.

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Section: Resultsmentioning

confidence: 99%

Effect of growth temperature on the structure and optical properties of ZnO nanorod arrays grown on ITO substrate

Zhang

Ruan

Liu

et al. 2013

Crystal Research and Technology

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“…Different processes have been reported to fabricate zinc oxide nanorods, such as physical vapor deposition [16,17], chemical vapor deposition [18], wet chemical deposition [19,20], ink-jet printing and hydrothermal processes [21,22], surfactant assisted hydrothermal methods [23], vapor phase transport [24,25], and pulsed laser deposition [26].…”

Section: Introductionmentioning

confidence: 99%

Water-resistant surfaces using zinc oxide structured nanorod arrays with switchable wetting property

Ennaceri

Wang

Erfurt

et al. 2016

Surface and Coatings Technology

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Abstract.This study presents an experimental approach for fabricating super-hydrophobic coatings based on a dual roughness structure composed of zinc oxide nanorod arrays coated with a sputtered zinc oxide nano-layer. The ZnO nanorod arrays were grown by mean of low-temperature electrochemical deposition technique (75°C) on FTO substrates with pre-sputtered ZnO seed layer of 30 nm thickness. The ZnO nanorods show a (002) orientation along the c-axis, and have a hexagonal structure, with an average length of 710 nm, and average width of 156 nm. On the other hand, the crystallite size of the top-coating sputtered ZnO layer is of 30 nm. The as-deposited ZnO nanorod arrays exhibited a hydrophobic behavior, with a surface water contact angle of 108°, whereas the dual-scale roughness ZnO nanorods coated with sputtered ZnO exhibited a superhydrophobic behavior, with a surface water contact angle of 157° and high water droplet adhesion. The photo-catalytic degradation of methylene blue in the presence of both the single roughness ZnO nanorod arrays, and dual roughness structured ZnO. The ZnO nanorod arrays showed good activity, with a degradation efficiency of 50% and a degradation constant of (k = 0.00225 min -1 ) after 5 hours of UV illumination. On the other hand, the ZnO dual roughness structure prepared by sputtered ZnO on top of the ZnO nanorod arrays showed minimal activity, with a degradation efficiency of 16% and a degradation constant of (k = 0.000586 min -1 ) after 5 hours of UV exposure. The double structured films exhibited high sensitivity to UV light, with a UV-induced switching behavior from super-hydrophobic to super-hydrophilic after only 30 minutes of UV exposure.Key Words: Super-hydrophobic, water contact angle, zinc oxide, nanorod arrays, rose petal effect, photo-catalysis. Highlights Hydrophobic ZnO nanorod arrays with high water-adhesion are achieved. Sputtered ZnO top-coating is used to reach super-hydrophobicity. Switchable wettability for ZnO single and dual roughness films under UV exposure. Strong pinning to the surface, similar to the rose-petal effect. The higher WCA is responsible for the decrease in the photo-catalysis activity.

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“…The diffraction intensity of the (002) surpasses others, which illustrates the c-oriented nature of the as-grown arrays [24] . The degree of the orientation can be illustrated by the relative texture coefficient [25] , which is given by I I TC I I I …”

Section: Effect Of Reaction Temperature Upon the Morphologies Of The mentioning

confidence: 99%

Controlled growth and photoluminescence of highly oriented arrays of ZnO nanocones with different diameters

Yang

Song

et al. 2009

Sci. China Ser. E-Technol. Sci.

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Large-scale oriented ZnO nanocone arrays were directly grown on zinc substrate through a hydrothermal reaction of Zn foil with aqueous butylamine solution (3 mol/L) at 100-180 ℃ for 12 h. The synthesized products were characterized with X-ray diffraction, Raman spectrum, scanning electron microscopy and transmission electron microscopy. The results showed that the ZnO nanocones were single crystalline with the wurtzite structure and grown along the [0001] direction. The diameter of nanocones is decreased with increasing the reaction temperature. A possible growth mechanism was also proposed to account for the formation of the ZnO nanocone arrays. The photoluminescence spectra of the ZnO nanocone arrays were studied at room temperature, two UV emission bands at 377 and 396 nm assigned to free exciton emission and exciton-exciton collision, respectively, and phonon replicas associated with 2-E 2 phonon were observed in the PL spectra.ZnO, ZnO nanocone arrays, butylamine, photoluminescence Zinc oxide is a direct and wide bandgap semiconductor with a large bandgap of 3.37 eV and a high exciton binding energy of 60 meV. The strong exciton binding energy of ZnO is much higher than that of GaN (25 meV). It has a wide range of application in solar cells, photocatalysts, light-emitting diodes, and sensors, etc. due to its distinguished optical, electrical, and chemical properties [1,2] . Since the first discovery of ZnO nanobelts and ultraviolet lasing from ZnO nanowire arrays in 2001, research on ZnO nanostructures with different morphologies has been rapidly expanded. To date, various physical and chemical routes have been used to prepare ZnO nanostructured materials in various geometrical morphologies, including nanowires [3] , nanobelts [4,5] , nanohelixes [6] , hexagonal nanodisks and rings [7] , nanorod and nanotube arrays [8] , etc. The ZnO nanorods or nanowires have been employed to fabricate logical circuits [9] , nanogenerators [10] and nanoscale chemical sensors for the detection of H 2[11] and C 2 H 5 OH [12] .Generally, the physical and chemical properties of the nanostructured materials not only depend on their size but also have a connection with their shape. Nanocones are more advantageous candidates for the scanning probes and field emitters [13,14] because electrons are more easily emitted from ZnO nanoneedles with sharp tips than from nanowires in uniform diameters [15] . Recently, Park [14] and Kim et al. [16] prepared well-aligned ZnO nanocones on Si substrates or Si substrates coated with ZnO nanoparticles by metal-organic chemical vapor deposition (MOCVD) process. Yu [17] , Xie [18] , and Chen [19] et al. synthesized ZnO nanoneedle arrays on Si plates or Ga-doped conductive ZnO film with chemical vapor deposition (CVD) method using Zn powders as

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Growth and formation mechanism of c-oriented ZnO nanorod arrays deposited on glass

Cited by 96 publications

References 22 publications

Effect of growth temperature on the structure and optical properties of ZnO nanorod arrays grown on ITO substrate

Effect of growth temperature on the structure and optical properties of ZnO nanorod arrays grown on ITO substrate

Water-resistant surfaces using zinc oxide structured nanorod arrays with switchable wetting property

Controlled growth and photoluminescence of highly oriented arrays of ZnO nanocones with different diameters

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