Control of diameter of ZnO nanorods grown by chemical vapor deposition with laser ablation of ZnO

Hirate, Takashi; Kimpara, Takashi; Nakamura, Shigenari; Satoh, Toshifumi

doi:10.1016/j.spmi.2007.04.011

Cited by 17 publications

(5 citation statements)

References 10 publications

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“…This confirmed that the removal of MB in the presence of hexagonal ZnO nanorods can be attributed to the ability of such structures to promote the production of radical species such as superoxide anions ( • O 2 − ) and hydroxyl radicals ( • OH) [ 65 ] thanks to the electron-hole pairs mechanism [ 24 ]. No substantial difference between the specimens was observed: in both cases a kinetic of first order (Equation (8)) well describes the MB removal time ( t ) in accordance with other authors [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ...…”

Section: Resultssupporting

confidence: 89%

“…It has excellent properties such as wide band gap ( E g = 3.37 eV) [ 17 ], high thermal conductivity and an inherent ability to exhibit different shapes and morphologies depending on the synthesis parameters [ 18 ]. Thermal evaporation [ 19 ], metal-organic chemical [ 20 ] or thermo-chemical [ 21 ] vapor deposition have been proposed for ZnO nanostructures fabrication, but all of these techniques are complex and involve high process temperature (>350 °C) [ 22 ]. The whiskerization approach leads to an increase in the toughness of the composites while a decrease of strength is observed, because of the high temperature involved during the synthesis of nanostructures [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…In [ 28 ] the authors reported the synthesis of mop-brush-shaped ZnO rods over nylon-6 electrospun nanofibers by incorporating ZnO nano-seeds directly in the electrospun nylon-6 fibers. Although the hydrothermal procedure has already been applied to electrospun materials, as previously discussed [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ], the coverage was not particularly homogeneous, and the authors did not investigate the thermal and mechanical properties of the resulting mats. Athauda et al [ 30 ] have for the first time successfully demonstrated the possibility of growing hexagonal wurtzite ZnO on self-made electrospun nylon veil by the hydrothermal method as low cost and easily extendable to large-scale production technique, but no description about the polymer modification during the chemical and thermal treatment is reported.…”

Section: Introductionmentioning

confidence: 99%

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Functionalization of Commercial Electrospun Veils with Zinc Oxide Nanostructures

et al. 2021

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The present research is focused on the synthesis of hexagonal ZnO wurtzite nanorods for the decoration of commercially available electrospun nylon nanofibers. The growth of ZnO was performed by a hydrothermal technique and for the first time on commercial electrospun veils. The growth step was optimized by adopting a procedure with the refresh of growing solution each hour of treatment (Method 1) and with the maintenance of a specific growth solution volume for the entire duration of the treatment (Method 2). The overall treatment time and volume of solution were also optimized by analyzing the morphology of ZnO nanostructures, the coverage degree, the thermal and mechanical stability of the obtained decorated electrospun nanofibers. In the optimal synthesis conditions (Method 2), hexagonal ZnO nanorods with a diameter and length of 53.5 nm ± 5.7 nm and 375.4 nm ± 37.8 nm, respectively, were obtained with a homogeneous and complete coverage of the veils. This easily scalable procedure did not damage the veils that could be potentially used as toughening elements in composites to prevent delamination onset and propagation. The presence of photoreactive species makes these materials ideal also as environmentally friendly photocatalysts for wastewater treatment. In this regard, photocatalytic tests were performed using methylene blue (MB) as model compound. Under UV light irradiation, the degradation of MB followed a first kinetic order data fitting and after 3 h of treatment a MB degradation of 91.0% ± 5.1% was achieved. The reusability of decorated veils was evaluated and a decrease in photocatalysis efficiency was detected after the third cycle of use.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Functionalization of Commercial Electrospun Veils with Zinc Oxide Nanostructures

et al. 2021

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“…A finding by Hirate et al is also promising and quite interesting. 42) They reported the controllable growth of ZnO nanorod diameters using chemical-vapor deposition (CVD) combined with laser ablation using a multi-step deposition. By controlling the oxygen flow rate in their system, they increased nanorod length while achieving a diameter that was either the same, smaller, or larger than the initial nanorod.…”

Section: Top Viewmentioning

confidence: 99%

Controllable Growth of Vertically Aligned Aluminum-Doped Zinc Oxide Nanorod Arrays by Sonicated Sol–Gel Immersion Method depending on Precursor Solution Volumes

Mamat

Khusaimi

Musa

et al. 2011

Jpn. J. Appl. Phys.

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Aluminium (Al)-doped zinc-oxide (ZnO) nanorod arrays have been successfully prepared using a novel and low-temperature sonicated sol–gel immersion method. The photoluminescence (PL) spectrum reveals the appearance of two emission peaks from the nanorod that are centred at 381 and 590 nm. The nanorod has a hexagonal structure with a flat-end facet, as observed using field-emission electron microscopy (FESEM). Interestingly, all samples have similar surface morphologies and diameter sizes of 40 to 150 nm after immersion in different precursor-solution volumes. The thickness-measurement results show that the thicknesses of the samples increase after immersion in higher precursor-solution volumes. We show for the first time that the growth of nanorod arrays along the c-axis can be controlled using different precursor volumes, and its growth mechanism is discussed. X-ray diffraction (XRD) spectra indicate that the prepared nanorods are ZnO with a hexagonal wurtzite structure that grows preferentially along the c-axis.

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“…Various synthesis methods have been used to fabricate ZnO crystals, such as sol-gel method [12], vapor phase transport process [13], thermal evaporation [14], metalorganic vapor phase epitaxy [15], thermal chemical vapor deposition [16]. But those methods require severe reaction conditions, such as high temperature (350 °C) and accurate gas concentration.…”

mentioning

confidence: 99%

The morphology and optical properties of ZnO crystals fabricated by hydrothermal method under pulsed magnetic field

Zhong

et al. 2013

Phys. Status Solidi C

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In this study, ZnO crystals have been synthesized via hydrothermal method by adjusting the component of the precursor with the pulsed magnetic field. The effects of the molar ratio of the reactants and pulsed magnetic field applied in the synthesis process on the microstructure and optical properties of ZnO crystals were investigated systematically. The samples were characterized by X‐ray diffraction, scanning electron microscopy, UV‐Vis spectrophotometer and micro‐Raman scattering. The results demonstrate that pulsed magnetic field increases the defects concentration and reduces the band gap of ZnO. And it also promotes nucleation and crystal growth, the crystals obtained under pulsed magnetic field are more uniform and complete. The change of molar ratios influences the pH value so that the environment for the growth of ZnO crystals changed dramatically. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Control of diameter of ZnO nanorods grown by chemical vapor deposition with laser ablation of ZnO

Cited by 17 publications

References 10 publications

Functionalization of Commercial Electrospun Veils with Zinc Oxide Nanostructures

Functionalization of Commercial Electrospun Veils with Zinc Oxide Nanostructures

Controllable Growth of Vertically Aligned Aluminum-Doped Zinc Oxide Nanorod Arrays by Sonicated Sol–Gel Immersion Method depending on Precursor Solution Volumes

The morphology and optical properties of ZnO crystals fabricated by hydrothermal method under pulsed magnetic field

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