scholarly journals Magnetic Properties of Well-Aligned ZnO Nanorod Arrays Grown by a Simple Hydrothermal Reaction

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Jiangni Yun ◽  
Rui Qu ◽  
Zhiyong Zhang ◽  
Jun Li
Keyword(s):  
Room Temperature ◽  
Hydrothermal Reaction ◽  
Substrate Surface ◽  
Room Temperature Ferromagnetism ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
Half Metallic

Well-aligned ZnO nanorod arrays with room temperature ferromagnetism were prepared on glass substrate through hydrothermal method. The as-prepared nanorod arrays were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), photoluminescence (PL) spectrum, and magnetization measurements. The XRD and SEM results indicated that the ZnO nanorods are with the wurtzite structure and exhibit preferential (002) orientation withc-axis perpendicular to the substrate surface. The PL results suggested that the possible defect in the as-prepared ZnO nanorod arrays might beVZn,Oi, orOZn. The first-principles calculations reveal that the room temperature ferromagnetism may result from theVZndefects present in the ZnO nanorod and the hybridization of the Zn 3d states with O 2p states is responsible for the half-metallic ferromagnetism in ZnO nanorod.

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.

OPTICAL CHARACTERIZATION OF ZnO NANOROD ARRAYS GROWN FROM SOLUTION

2010 ◽  
Vol 09 (05) ◽  
pp. 447-451 ◽  
Author(s):  
WALTER WATER ◽  
TE-HUA FANG ◽  
LIANG-WEN JI ◽  
CHING-CHIN LEE
Keyword(s):  
Zno Nanorods ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Current Voltage ◽  
Ito Glass

ZnO nanorods were synthesized on ZnO / ITO glass substrates using an aqueous solution of zinc nitrate hexahydrate and hexamethylenetetramine. The effects of hexamethylenetetramine concentration on the crystalline structure and surface morphology of ZnO nanorods were investigated. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the crystalline characteristics and microstructures of the nanorod arrays. Ultraviolet/visible spectroscopy and photoluminescence (PL) spectra were used to characterize the optical properties of ZnO nanorods. Larger and brighter photoluminescent ZnO nanorods were obtained from solutions with higher hexamethylenetetramine concentrations. A nanogenerator based on ZnO nanorod arrays was fabricated in the investigation. The nanogenerator's current–voltage characteristics with Schottky-like behavior were discussed.

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.

Defects related room temperature ferromagnetism in Cu-implanted ZnO nanorod arrays

2014 ◽  
Vol 591 ◽  
pp. 80-84 ◽  
Author(s):  
D. Li ◽  
D.K. Li ◽  
H.Z. Wu ◽  
F. Liang ◽  
W. Xie ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays

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.

A Solution Method for Large-scale Selective Growth of Aligned ZnO Nanorods

2006 ◽  
Vol 957 ◽  
Author(s):  
Yoon-Bong Hahn ◽  
Ahmad Umar ◽  
Sang Hoon Kim ◽  
Yeon Ho Im ◽  
Yoon Bong Hahn
Keyword(s):  
Room Temperature ◽  
Hexagonal Phase ◽  
Zno Nanorods ◽  
Ultra Violet ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Violet Emission ◽  
Room Temperature Photoluminescence ◽  
Wurtzite Hexagonal Phase

ABSTRACTA facile and convenient aqueous route has been employed to synthesize well -aligned ZnO nanorods. Field emission scanning electron microscopy studies of ZnO nanorod arrays grown at 70°C on ZnO/Si substrates show fine homogeneous surface. The average diameter of ZnO nanorod is in between 50-60 nm .The length of each nanorod is about 400-500 nm. Structural analysis showed that the ZnO nanorods are single crystalline with wurtzite hexagonal phase. Room temperature photoluminescence spectra of the ZnO nanorod arrays exhibit ultra violet emission and green emission. In addition, selective growth of ZnO nanorods on patterned ITO glass substrate is obtained. Each nanorod has diameter of 50 - 70 nm and their length upto 500 nm. XRD pattern shows that ZnO nanorods on patterned ITO substrate are single crystalline in nature with wurtzite hexagonal phase. The room temperature photoluminescence from the aligned ZnO nanorods showed a strong ultra violet emission at 378 nm and broad deep level visible emission at 580 nm.

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.

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.

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