CVD synthesis of Al2O3 nanotubular structures using a powder source

Park, Si Jung; Choi, Doo Jin

doi:10.1016/j.ceramint.2013.12.140

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…As shown in Figure 1(d,e), the change in nanowire diameter is unremarkable when the deposition time is increased twofold. This retardation of nanowire growth occurred because of the depletion of the limited ZrCl 4 source, after which the nanocomposites underwent an annealing process [15]. During the annealing process, ZrO 2 nanocrystals on the surface grew and merged via surface diffusion.…”

Section: Resultsmentioning

confidence: 99%

“…The FFT image in the inset of Figure 5(b) indicates that the nanocomposites comprise large crystals and that the lattice fringes show a d-spacing of 0.153 nm, corresponding to the (211) plane spacing of tetragonal ZrO 2 . During long deposition, ZrO 2 nanocrystals on the surface coalesce via surface diffusion after source depletion and relatively large-sized crystals are shown [15]. Nevertheless, Figure 5(b) shows that mainly the tetragonal phase appeared and that the monoclinic phase did not appear.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of porous Al₂O₃/ZrO₂nanocomposites by chemical vapour deposition

Park

Choi

2017

Advances in Applied Ceramics

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Al 2 O 3 /ZrO 2 one-dimensional nanocomposite structures were synthesised by chemical vapour deposition using Al 2 O 3 nanowires and a ZrCl 4 powder source at a temperature of 800 °C and a pressure of 130 Pa. The samples were characterised using X-ray diffraction, the scanning electron microscopy, the transmission electron microscopy, and N 2 adsorption-desorption. The results revealed that Al 2 O 3 /ZrO 2 composite nanowires coated with surface-embedded ZrO 2 nanocrystals were formed and that the ZrO 2 macroporous and mesoporous structures changed as the ZrO 2 deposition time increased. The pore structure and surface area were also elucidated from the N 2 adsorption-desorption measurements.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis of porous Al₂O₃/ZrO₂nanocomposites by chemical vapour deposition

Park

Choi

2017

Advances in Applied Ceramics

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“…The direct optical transitions at Γ from the valence band maximum (VBM) to the conduction band minimum (CBM) are parity forbidden, so the first strong transitions occur from valence bands 0.81 eV below the VBM [26]. In contrast, Al 2 O 3 with a larger band gap of 8.7 eV [27] is a deep-ultraviolet transparent oxide which is considered as a good passivation layer [28] in the fabrication of optoelectronic devices, and it has been used as a perfect substrate material for films growth [29,30]. However, it is rather difficult for Al 2 O 3 to introduce shallow donor levels because the position of conduction band bottom is relatively high and the donor levels become deep levels.…”

Section: Introductionmentioning

confidence: 99%