Electrical Response of Wet Chemically Grown ZnO Nanorods for Photovoltaic Application

2006 ◽  
Vol 974 ◽  
Author(s):  
Julian Tornow ◽  
Klaus Schwarzburg
Keyword(s):  
Electrolyte Solution ◽  
Electrical Response ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
Capacitive Behavior ◽  
Photovoltaic Application ◽  
Capacitive Element ◽  
Frequency Independent ◽  
Semiconductor Electrodes ◽  
Charge Capacitance

ABSTRACTWet chemically prepared arrays of ZnO nanorods in electrolyte solution were investigated with respect to their capacitive behavior. The ZnO nanorod electrode could be well described by a frequency independent capacitive and a conductive element in parallel. The capacitive element is determined as space charge capacitance in the nanorods. However the dependency of the nanorod electrodes capacitance on the applied voltage bias is more complicated than for flat semiconductor 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.

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.

scholarly journals Facile Preparation and Enhanced Visible-Light Photocatalysis of ZnO Arrays@BiOI Nanosheets Heterostructures

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Da Zhang ◽  
Yuanyi Wang ◽  
Liang Chen ◽  
Chengjing Xiao ◽  
Jing Feng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Visible Light ◽  
Zno Nanorods ◽  
Potential Method ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Step Method ◽  
X Ray ◽  
Bioi Nanosheets

A simple two-step method of growing ZnO nanorod arrays on the surface of BiOI nanosheets was developed under mild environment. The hierarchical structure of ZnO arrays@BiOI nanosheets was characterized by various measurements like X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray detector. The optical absorption of the ZnO arrays@BiOI nanosheets composite was investigated by UV-Vis diffuse reflectance spectra. The photocatalytic degradation of methanol orange under visible light shows that the obtained ZnO arrays@BiOI nanosheets heterostructures exhibit enhanced photocatalytic activity, contrasting to the sum of BiOI nanosheets and ZnO nanorods. The mechanism of the photocatalytic process was discussed. This method of growing ZnO nanorod arrays on other nanosheets also provides a potential method to fabricating other complex structures.

scholarly journals Construction of 3D Arrays of Cylindrically Hierarchical Structures with ZnO Nanorods Hydrothermally Synthesized on Optical Fiber Cores

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Weixuan Jing ◽  
Han Qi ◽  
Jiafan Shi ◽  
Zhuangde Jiang ◽  
Fan Zhou ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Zno Nanorods ◽  
Hierarchical Structures ◽  
Power Spectrum Density ◽  
Zno Nanorod ◽  
Characteristic Parameters ◽  
Front View ◽  
Spectrum Density ◽  
Surface Morphologies

With ZnO nanorods hydrothermally synthesized on manually assembled arrays of optical fiber cores, 3D arrays of ZnO nanorod-based cylindrically hierarchical structures with nominal pitch 250 μm or 375 μm were constructed. Based on micrographs of scanning electron microscopy and image processing operators of MATLAB software, the 3D arrays of cylindrically hierarchical structures were quantitatively characterized. The values of the actual diameters, the actual pitches, and the parallelism errors suggest that the process capability of the manual assembling is sufficient and the quality of the 3D arrays of cylindrically hierarchical structures is acceptable. The values of the characteristic parameters such as roughness, skewness, kurtosis, correlation length, and power spectrum density show that the surface morphologies of the cylindrically hierarchical structures not only were affected significantly by Zn2+concentration of the growth solution but also were anisotropic due to different curvature radii of the optical fiber core at side and front view.

scholarly journals Controlling the hydrothermal growth and the properties of ZnO nanorod arrays by pre-treating the seed layer

RSC Advances ◽  
2014 ◽  
Vol 4 (84) ◽  
pp. 44452-44456 ◽  
Author(s):  
Y. Yin ◽  
Y. Sun ◽  
M. Yu ◽  
X. Liu ◽  
B. Yang ◽  
...  
Keyword(s):  
Seed Layer ◽  
Zno Nanorods ◽  
Hydrothermal Growth ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays

Annealing or plasma pre-treating the ZnO seed layer influences the nucleation and hydrothermal growth of ZnO nanorods and their photoluminescence.

scholarly journals A simple all-solution approach to the synthesis of large ZnO nanorod networks

2015 ◽  
Vol 3 (8) ◽  
pp. 4568-4577 ◽  
Author(s):  
A. Resmini ◽  
I. G. Tredici ◽  
C. Cantalini ◽  
L. Giancaterini ◽  
F. De Angelis ◽  
...  
Keyword(s):  
Soft Lithography ◽  
Growth Process ◽  
Zno Nanorods ◽  
Hydrothermal Growth ◽  
Zno Nanorod ◽  
Process Yield ◽  
Solution Approach ◽  
Self Assembling

Soft-lithography of Zn-loaded hydrogels and a subsequent hydrothermal growth process yield self-assembling networks of bridging ZnO nanorods (NRs). They are grown on seeding micropillars of ZnO until they touch, forming junctions that provide a preferred electrical path for the operative current of functional devices (e.g. gas senors).

scholarly journals Fabrication of Hybrid Catalyst ZnO Nanorod/α-Fe2O3 Composites for Hydrogen Evolution Reaction

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 356
Author(s):  
Kasimayan Uma ◽  
Elavarasan Muniranthinam ◽  
Siewhui Chong ◽  
Thomas C.-K Yang ◽  
Ja-Hon Lin
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Nickel Foam ◽  
Zno Nanorods ◽  
Synergetic Effect ◽  
Zno Nanorod ◽  
Fe2o3 Nanoparticles ◽  
X Ray

This report presents the synthesis of ZnO nanorod/α-Fe2O3 composites by the hydrothermal method with different weight percentages of α-Fe2O3 nanoparticles. The as-synthesized nanorod composites were characterized by different techniques, such as X-ray diffraction (XRD), Fourier transform-infrared (FT-IR), field emission scanning electron microscopy (FE-SEM), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS). From our results, it was found that the ZnO/α-Fe2O3 (3 wt%) nanorod composites exhibit a higher hydrogen evolution reaction (HER) activity when compared to other composites. The synergetic effect between ZnO and (3 wt%) of α-Fe2O3 nanocomposites resulted in a low onset potential of −125 mV, which can effectively produce more H2 than pure ZnO. The H2 production rate over the composite of ZnO/α-Fe2O3 (3 wt%) clearly shows a significant improvement in the photocatalytic activity in the heterojunction of the ZnO nanorods and α-Fe2O3 nanoparticles on nickel foam.

scholarly journals NANOPARTICLE BASED BIOSENSOR FOR PENICILLIN QUANTIFICATION IN PHARMACEUTICALS

2019 ◽  
pp. 102-107
Author(s):  
EMINE KARAKUS ◽  
CISEM TURAN
Keyword(s):  
Response Time ◽  
Zno Nanoparticles ◽  
Pharmaceutical Preparation ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
Buffer Concentration ◽  
Optimum Temperature ◽  
Short Response Time ◽  
Biosensor System ◽  
Optimum Ph

Objective: The objective of this study was to develop a new biosensor system based on nanoparticle to determine penicillin in pharmaceuticals. Methods: The characterization and optimization of the potentiometric penicillin biosensor (PB) were prepared by using synthesized surface-dependent and surface-independent ZnO nanoparticles named ZnO nanorods and chitosan were carried out. It was preferred ZnO nanorod because of its electrical, optical, physical and photocatalyst properties, biocompatibility and non-toxicity in the construction of the penicillin biosensor. Results: The operating range was obtained as 10-1-10-3M, the optimum buffer concentration was 10 mmol, optimum pH was 7.4 and the optimum temperature was 25 °C for the PB. The PB has advantages in terms of short response time, long enough shelf life, cheap, and easy elaborate. Conclusion: Whether the biosensor can be used to determine penicillin and accurately measure penicillin, the amount of penicillin in a commercial pharmaceutical preparation named Alfoxil was successfully made by using our prepared penicillin biosensor.

Hydrothermal of ZnO Nanorod Arrays on ITO Transparent Conductive Oxide Substrate: Effect of Precursor Concentration

2016 ◽  
Vol 675-676 ◽  
pp. 134-137
Author(s):  
Phattharaphong Khamkhom ◽  
Mati Horprathum ◽  
Pitak Eiamchai ◽  
Chanunthorn Chananonnawathorn ◽  
Sukon Kalasung ◽  
...  
Keyword(s):  
Zno Nanorods ◽  
Water Structure ◽  
Transparent Conductive Oxide ◽  
Zinc Nitrate ◽  
Precursor Concentration ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Hexagonal Shape ◽  
Scanning Electron

In this study, we fabricated the zinc oxide (ZnO) nanorods arrays by hydrothermal technique on indium doped tin oxide (ITO) substrate with different concentration of the precursor with zinc nitrate and hexamethyleneteramine (HMTA) in distilled water. Structure, morphology and optical properties of ZnOnanorods on ITO substrate were characterized by x-ray diffractometer, field-emission scanning electron microscope and spectrophotometer, respectively. The ZnO nanorod arrays showing preferentially oriented in the (001) direction and with a wurtzite structure. The scanning electron microscopy results showed that the hexagonal shape ZnO nanorods. It was found that the diameter, length and density of the ZnO nanorods arrays were strongly influenced by the precursor concentration.

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