The Effect of Growth Time on the Morphology of ZnO Nanorods by Hydrothermal Method

2012 ◽  
Vol 622-623 ◽  
pp. 855-859
Author(s):  
Xiu Ming Ren ◽  
He Qiu Zhang ◽  
Li Zhong Hu ◽  
Jiu Yu Ji ◽  
Yang Li ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Crystal Size ◽  
Zno Nanorods ◽  
Hexagonal Wurtzite Structure ◽  
Solution Temperature ◽  
Continuous Heating ◽  
Growth Time ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Si Substrates

ZnO nanorod arrays were synthesized by hydrothermal method under different growth times. The effect of growth time on nanorods morphology was investigated systematically. Results illustrate that ZnO nanorods with hexagonal wurtzite structure grow vertically on the Si substrates. The length of the ZnO nanorods increases with increasing growth time. In our experiments, quenching stage plays a key role in forming the tips of nanorods. With growth time no more than 1h, the solution is in a continuous heating state and doesn’t reach the set temperature 180oC. Therefore, longer growth time means higher solution temperature which in turn increases cooling rate during quenching stage, as a consequence, to a smaller mean crystal size in the nanorods tips.

Effects of Growth Time on Morphologies of ZnO Nanorod Arrays

2013 ◽  
Vol 421 ◽  
pp. 324-328
Author(s):  
Kang Zhao ◽  
Zhi Ming Wu ◽  
Rong Tang
Keyword(s):  
Zno Nanorods ◽  
Length Distribution ◽  
Growth Time ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Si Substrates ◽  
Seed Layers

well-aligned ZnO nanorod arrays (ZNRAs) grown on the ZnO seed layers coated p-silicon (p-Si) substrates in various times from 1.5 to 5 hr have been fabricated from aqueous solutions at low temperature. Morphologies, crystalline structure and optical transmission were investigated by a scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. The results showed that ZNRAs grew vertically from the substrates, having uniform thickness and length distribution, the average diameters and length of ZnO nanorods increased with increasing growth time below 3 hr. The XRD results showed that ZnO nanorods were wurtzite-structured (hexagonal) ZnO.

scholarly journals Morphological and structural characterization of single-crystal ZnO nanorod arrays on flexible and non-flexible substrates

2015 ◽  
Vol 6 ◽  
pp. 720-725 ◽  
Author(s):  
Omar F Farhat ◽  
Mohd M Halim ◽  
Mat J Abdullah ◽  
Mohammed K M Ali ◽  
Nageh K Allam
Keyword(s):  
Single Crystal ◽  
Crystallite Size ◽  
Zno Nanorods ◽  
Hexagonal Wurtzite Structure ◽  
Growth Conditions ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Synthesis Conditions ◽  
Si Substrates

We report a facile synthesis of zinc oxide (ZnO) nanorod arrays using an optimized, chemical bath deposition method on glass, PET and Si substrates. The morphological and structural properties of the ZnO nanorod arrays were investigated using various techniques such as field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) measurements, which revealed the formation of dense ZnO nanorods with a single crystal, hexagonal wurtzite structure. The aspect ratio of the single-crystal ZnO nanorods and the growth rate along the (002) direction was found to be sensitive to the substrate type. The lattice constants and the crystallite size of the fabricated ZnO nanorods were calculated based on the XRD data. The obtained results revealed that the increase in the crystallite size is strongly associated with the growth conditions with a minor dependence on the type of substrate. The Raman spectroscopy measurements confirmed the existence of a compressive stress in the fabricated ZnO nanorods. The obtained results illustrated that the growth of high quality, single-crystal ZnO nanorods can be realized by adjusting the synthesis conditions.

scholarly journals The Kinetic Study of The Hydrothermal Growth of Zno Nanorod Array Films / Zno Nanostieņu Kopu Pārklājuma Hidrotermālās Augšanas Kinētikas Izpēte

2015 ◽  
Vol 52 (5) ◽  
pp. 20-27 ◽  
Author(s):  
V. Gerbreders ◽  
P. Sarajevs ◽  
I. Mihailova ◽  
E. Tamanis
Keyword(s):  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Hexagonal Wurtzite Structure ◽  
Hydrothermal Growth ◽  
Solution Temperature ◽  
Zno Films ◽  
Nitrate Hexahydrate ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Kinetics Of

Abstract The simple analysis method has been introduced for the kinetic analysis of the hydrothermal growth. The zinc oxide nanorod arrays have been synthesized via a hydrothermal process. Zinc nitrate hexahydrate (Zn(NO3)2 · 6H2O) has been used as the precursor in the presence of hexamethylenetetramine (C6H12N4) for the formation of ZnO nanostructures. Long-term isothermal growth kinetics of ZnO nanorods has been investigated. The effect of the solution temperature (70-90 ℃) on the kinetics of the hydrothermal growth of ZnO nanorods has been examined. An extensive analysis by scanning electron microscopy, energy dispersive spectroscopy and x-ray diffraction has revealed that the as-synthesized ZnO nanorod arrays are well-crystalline and possessing hexagonal wurtzite structure. These ZnO films have promising potential advantages in microelectronic and optoelectronic applications.

Synthesis of ZnO Nanorod Arrays Structure on Si Substrate

2015 ◽  
Vol 1131 ◽  
pp. 53-59
Author(s):  
Suttinart Noothongkaew ◽  
Supakorn Pukird ◽  
Worasak Sukkabot ◽  
Ki Seok An
Keyword(s):  
Zno Nanorods ◽  
Chemical Vapor ◽  
Yellow Emission ◽  
Growth Time ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
Vapor Deposition Technique ◽  
Condensation Growth

ZnO nanorod arrays were synthesized with simple chemical vapor deposition technique with template without using catalyst by controlling the growth time and condensation growth. The surface morphology of nanostructure were characterized by using field emission scanning electron microscopy (FE-SEM), we found that the ZnO nanorod arrays were uniformly covered on substrate. The extremely strong ZnO (0002) peaks were observed by using X-ray diffraction (XRD), shown the preferred (0001) orientation and high crystalline quality of the ZnO nanostructures. The optical properties were investigated by using photoluminescence (PL). These results showed the contribution of green-yellow emission attributed to the strong inner reflection and scattering. Our results indicating that the uniform ZnO nanorods arrays can be synthesized by using a simplified method. Furthermore, they will be implemented as application for nanodevice fabrication or for gas sensors and solar cells.

Controllable Synthesis of ZnO Nanorod Arrays via Simple Solution-Based Method

2006 ◽  
Vol 957 ◽  
Author(s):  
Patcharee Charoensirithavorn ◽  
Susumu Yoshikawa
Keyword(s):  
Transparent Conducting Oxide ◽  
Zno Nanorods ◽  
Solution Temperature ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
Transparent Conducting

ABSTRACTHere we present a convenient solution-based method, which can afford a procedure to easily fabricate highly oriented ZnO nanorods on substrate at relatively low temperatures. The as-synthesized products have been characterized by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). The results revealed that a densely packed and perpendicularly oriented single-crystalline ZnO nanorod arrays grew vertically on the fluorine-doped SnO2 transparent conducting oxide (FTO) glass substrates. In addition, we found that the length of the nanorod could be freely modified by controlling the solution temperature.

Effect of Time Conditions on the Growth of ZnO Nanorods via Hydrothermal Method

2014 ◽  
Vol 895 ◽  
pp. 509-512 ◽  
Author(s):  
N.A. Nik Aziz ◽  
M.I.N. Isa ◽  
Hasiah Salleh
Keyword(s):  
Hydrothermal Method ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wurtzite Crystal Structure ◽  
Ito Glass ◽  
Xrd Patterns

In this study, ZnO nanorod arrays were fabricated using a hydrothermal method on ITO glass substrate. We can find that the dimension of ZnO nanorod will changes with different growth temperature. X-ray diffraction (XRD) patterns show that the nanorods are high-quality crystals growing along [00 direction with a high consistent orientation perpendicular to the substrate and it is also revealed that nanorods have wurtzite crystal structure. The diameter of ZnO nanorods were 100300 nm depending on the time of growth process. The surface morphology of ZnO nanorods were analyse using Scanning Electron Microscope (SEM).

Hydrothermal Synthesis of Well-Aligned ZnO Nanorod Arrays on Silicon

2013 ◽  
Vol 669 ◽  
pp. 302-306
Author(s):  
Tian Ning Xu ◽  
Zhong Lu ◽  
Cheng Hua Sui ◽  
Hui Zhen Wu
Keyword(s):  
Reaction Temperature ◽  
Zno Nanorods ◽  
Visible Region ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
Si Substrates ◽  
Optimal Reaction Temperature ◽  
Optimal Reaction

Zinc oxide (ZnO) nanorod arrays were fabricated on ZnO:Al seeded Si substrates with various reaction temperatures using a low temperature hydrothermal method. The morphology and structure of ZnO nanorod arrays were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). It reveals that the ZnO nanorods grow vertically on Si surface with (002) preferential orientation. The transmittance spectra show the ZnO nanorod arrays fabricated at low temperatures have high transmittance in the visible region and decrease with reaction temperature increasing. Moreover, the same trend was also observed in the reflectance spectra of the ZnO nanorod arrays. The optimal reaction temperature is of 120 °C for ZnO nanorod arrays with high transmittance (~80%) and low reflectance (~10%) in the visible region. The superior optical properties make ZnO nanorod arrays promising for applications as transparent electrodes.

Flame retardancy of wood coated by ZnO nanorod arrays via a hydrothermal method

2012 ◽  
Vol 16 (5) ◽  
pp. 326-331 ◽  
Author(s):  
Q F Sun ◽  
Y Lu ◽  
H M Zhang ◽  
D J Yang ◽  
J S Xu ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Flame Retardancy ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays

Facile Synthesis of a Porous ZnO Nanorod Array with Enhanced Photocatalysis for Photoelectrochemical Water Splitting Application

2020 ◽  
Vol 20 (6) ◽  
pp. 3512-3518
Author(s):  
Saleh Khan ◽  
Xiao-He Liu ◽  
Xi Jiang ◽  
Qing-Yun Chen
Keyword(s):  
Annealing Temperature ◽  
Zno Nanorods ◽  
Nanorod Array ◽  
Photocurrent Density ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Irradiation Intensity ◽  
Heat Treated ◽  
Positive Effect

Highly efficient and effective porous ZnO nanorod arrays were fabricated by annealing ZnO nanorod arrays grown on a substrate using a simple hydrothermal method. The annealing had a positive effect on the nanorod morphology, structure and optical properties. The porosity was closely related to the annealing temperature. After heating at 450 °C, pores appeared on the nanorods. It was demonstrated that the porosity could be exploited to improve the visible light absorption of ZnO and reduce the bandgap from 3.11 eV to 2.99 eV. A combination of improved charge separation and transport of the heat-treated ZnO thus led to an increase in the photoelectrochemical properties. At an irradiation intensity of 100 mW/cm−2, the photocurrent density of the porous nanorod array was approximately 1.3 mA cm−2 at 1.2 V versus Ag/AgCl, which was five times higher than that of the ZnO nanorods. These results revealed the synthesis of promising porous ZnO nanorods for photoelectrochemical applications.

ZnO nanorod arrays grown on an AlN buffer layer and their enhanced ultraviolet emission

CrystEngComm ◽  
2017 ◽  
Vol 19 (41) ◽  
pp. 6085-6088 ◽  
Author(s):  
Amany Ali ◽  
DongBo Wang ◽  
JinZhong Wang ◽  
ShuJie Jiao ◽  
FengYun Guo ◽  
...  
Keyword(s):  
Buffer Layer ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Ultraviolet Emission ◽  
Aln Buffer

The ultraviolet luminescence of ZnO nanorods was greatly enhanced through introducing an AlN buffer layer.

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