Fabrication and characterization of tetrapod-like ZnO nanostructures prepared by catalyst-free thermal evaporation

Feng, Libing; Liu, Aihua; Liu, Mei; Ma, Yuying; Wei, Jing; Man, Baoyuan

doi:10.1016/j.matchar.2009.10.011

Cited by 55 publications

(20 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that the PL spectra composed of two emission bands: a strong ultraviolet (UV) band at ∼380 nm, and a green emission band are centered at ∼520nm. The UV emission is introduced from the exitonic recombination analogous to the near band edge (NBE) emission of band gap ZnO, indicating the growth of good quality ZnO nanostructures [24]. The shape of all the spectra, similar to those reported by others [25][26], are dominated by strong near edge UV emission and defect related deep level emission.…”

Section: Resultssupporting

confidence: 77%

Fabrication and characterization of ZnO nanostructures on Si(111) substrate using a thin AlN buffer layer

Chuah¹

2013

NANO

View full text Add to dashboard Cite

. Fabrication and characterization of ZnO nanostructures on Si(111) substrate using a thin AlN buffer layer. American Journal of Nanoscience and Nanotechnology. Vol. 1, No. 1, 2013, pp. 1-5. doi:10.11648/j. nano.2013.0101.11 Abstract: In the present work, radio-frequency (RF) nitrogen plasma-assisted molecular beam epitaxy (PA-MBE) technique was used to grow AlN thin layers on Si (111) substrate. Subsequently, the thermal evaporation technique was used to deposit the zinc films on Si(111) substrates with AlN as buffer layer. ZnO nanostructures were obtained from zinc granulated (99.99%) by thermal oxidation from 400 °C to 600 °C in air for 1 hours without any catalysts. The effect of annealing temperatures were studied ranging from 400 °C to 600 °C in air for 1 hours. The AlN was introduced to accommodate the lattice mismatch and thermal expansion mismatch between ZnO layer and Si substrate. The structural and optical properties of ZnO nanostructures are studied through scanning electron microscopy (SEM), X-ray diffraction (XRD) and room temperature photoluminescence (PL) spectroscopy. The films show a polycrystalline hexagonal wurtzite structure without preferred (0002) orientation. The mean grain sizes are calculated to be about 18 nm, 22 nm and 50 nm for the ZnO films prepared at temperatures of 400 °C, 500 °C and 600 °C. The structure of the fabricated nanomaterials were characterized by scanning electron microscopy (SEM). The PL spectra of the ZnO nanostructures having a sharp excitonic ultraviolet (UV) emission and very weak defect-related deep level visible emissions. It is showed that the ZnO nanostructures thermal annealed treatment was performed at 600 °C shows the strongest UV emission intensity among the temperatures ranges studied. In addition, from the one-dimensional ZnO nanostructures thermal annealed at 600 °C, the stronger UV emission is assigned to the best crystalline quality of the ZnO film.

show abstract

Section: Resultssupporting

confidence: 77%

Fabrication and characterization of ZnO nanostructures on Si(111) substrate using a thin AlN buffer layer

Chuah¹

2013

NANO

View full text Add to dashboard Cite

show abstract

“…Differrent morphologies of ZnO structures such as nanorods [1][2][3], nanowires [4,5], hollow spheres [6], hammershaped particles [7], nanocubes [8], nanoparticles [9,10], tetrapod [11], nanotubes [12,13] and nanocrystals [10,14] have been synthesized by both chemical and physical methods: sol-gel process [15][16][17], hydrothermal process [18][19][20], thermal evaporation [3,7,9,11], chemical vapor deposition (CVD) [6,21,22], ultrasonicassisted synthesis [8,14,23] and microwave radiation [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Effect of microwave power on energy gap of ZnO nanoparticles synthesized by microwaving through aqueous solutions

Promnopas

Thongtem

2015

Superlattices and Microstructures

View full text Add to dashboard Cite

“…In addition, in the present work, ZnO microrods with large top diameters were synthesized via thermal evaporation of ZnS and a mixture of ZnS with Zn in air atmosphere. When using thermal evaporation of metallic Zn, tetrapod-like ZnO structures have been typically produced at temperatures above 900 C under normal ambient air [15][16][17] . Thus, it is suggested that the ZnO microrods with large top diameters could be fabricated by using ZnS powder as the source material.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Nail-Shaped ZnO Microrods by Thermal Evaporation Technique in Ambient Air

Lee

2017

Mater. Trans.

View full text Add to dashboard Cite

ZnO microrods with inverted cone shape and nail-like shape were formed by thermal evaporation of ZnS powder and ZnS/Zn mixture under air atmosphere. No catalysts and substrates were used. When ZnS powder was used as a source material, ZnO crystals had an inverted hexagonal cone shape, where the diameter of the microrods increased gradually from about 10 μm at the bottom to 35 μm at the top. When a mixture of ZnS and Zn powders was used as a source material, the diameters of the ZnO microrods increased signi cantly up to 40 80 μm at the top, which makes the ZnO microrods a nail-like shape. X-ray diffraction patterns showed that all the ZnO microrods had a wurtzite crystallographic structure. Two emission peaks were observed in the cathodoluminescence spectra at room temperature. One was a peak at around 380 nm (ultraviolet) and the other was a peak at 510 nm (green). The high intensity ratio of ultraviolet emission to green emission was obtained for the nail-shaped ZnO microrods, indicating the high crystalline quality of the ZnO microrods.

show abstract

Fabrication and characterization of tetrapod-like ZnO nanostructures prepared by catalyst-free thermal evaporation

Cited by 55 publications

References 42 publications

Fabrication and characterization of ZnO nanostructures on Si(111) substrate using a thin AlN buffer layer

Fabrication and characterization of ZnO nanostructures on Si(111) substrate using a thin AlN buffer layer

Effect of microwave power on energy gap of ZnO nanoparticles synthesized by microwaving through aqueous solutions

Facile Synthesis of Nail-Shaped ZnO Microrods by Thermal Evaporation Technique in Ambient Air

Contact Info

Product

Resources

About