scholarly journals Enhancement of ZnO Nanorods Properties Using Modified Chemical Bath Deposition Method: Effect of Precursor Concentration

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 386
Author(s):  
Ahmed Fattah Abdulrahman ◽  
Sabah Mohammed Ahmed ◽  
Naser Mahmoud Ahmed ◽  
Munirah Abullah Almessiere
Keyword(s):  
Growth Rate ◽  
Chemical Bath Deposition ◽  
Zno Nanorods ◽  
Precursor Concentration ◽  
Favorable Result ◽  
Optical Studies ◽  
Modified Method ◽  
Aspect Ratios ◽  
Conventional Methods ◽  
Cbd Method

In this study, the effects of different precursor concentrations on the growth and characteristics properties of the zinc oxide (ZnO) nanorods (NRs) synthesized by using modified and conventional chemical bath deposition (CBD) methods were investigated. The morphologic, structural and optical properties of synthesized ZnO NRs with different precursor concentrations were studied using various characterization techniques. The experimental results show that the varying precursor concentration of the reactants has a remarkable and significant effect on the growth and characteristics properties of ZnO NRs. In addition, the characteristic properties of ZnO NRs grown using the modified method showed significantly improved and enhanced properties. The average length of grown ZnO NRs increased with increased precursor concentration; it can be seen that longer ZnO NRs have been investigated using the modified CBD methods. The ZnO NRs synthesized at 0.05 M using the modified method were grown with high aspect ratios than the ZnO NRs grown using conventional means which were 25 and 11, respectively. The growth rate increased with increased precursor concentration; it can be observed that a higher growth rate was seen using the modification CBD method. Furthermore, XRD results for the two cases reveal that the grown ZnO samples were a nanorod-like in shape and possessed a hexagonal wurtzite structure with high crystal quality. No other phases from the impurity were observed. The diffraction peaks along (002) plane became higher, sharper and narrower as precursor concentration increased, suggesting that the crystalline quality of ZnO NRs grown using the modified method was more enhanced and better than conventional methods. However, optical studies show that the transmittance at each concentration was more than two times higher than the transmittance using the modified CBD method. In addition, optical studies demonstrated that the ZnO NRs grown by using modified and conventional methods had a direct Eg in the range of (3.2–3.26) eV and (3.15–3.19) eV, respectively. It was demonstrated in two methods that ZnO NRs grown at a precursor concentration 0.05 M gave the most favorable result, since the NRs had best characteristic properties.

scholarly journals Fabrication and Characterization of High-Quality UV Photodetectors Based ZnO Nanorods Using Traditional and Modified Chemical Bath Deposition Methods

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 677
Author(s):  
Ahmed Fattah Abdulrahman ◽  
Sabah Mohammed Ahmed ◽  
Azeez Abdullah Barzinjy ◽  
Samir Mustafa Hamad ◽  
Naser Mahmoud Ahmed ◽  
...  
Keyword(s):  
Growth Rate ◽  
Aspect Ratio ◽  
Chemical Bath Deposition ◽  
Zno Nanorods ◽  
High Quality ◽  
Uv Photodetectors ◽  
X Ray ◽  
Double Beam ◽  
Cbd Method ◽  
The Impact

Ultraviolet (UV) photodetectors (PDs) based on high-quality well-aligned ZnO nanorods (NRs) were fabricated using both modified and conventional chemical bath deposition (CBD) methods. The modified chemical bath deposition (M-CBD) method was made by adding air bubbles to the growth solution during the CBD process. The viability and effectiveness of M-CBD were examined by developing UV PDs based on ZnO NRs. The ZnO nano-seed layer was coated on a glass substrate utilizing radiofrequency (RF) sputtering. The impact of the different growth-times on morphology, growth rate, crystal structure, and optical and chemical properties were investigated systematically using different characterization techniques, such as field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) analysis, UV–VIS double beam spectrometer, and energy dispersive X-ray analysis (EDX), respectively. The Al/ZnO UV PDs based on ZnO nanorods were fabricated with optimum growth conditions through the two methods of preparation. This study showed that the synthesized ZnO NRs using the M-CBD method for different growth times possess better properties than the conventional method under similar deposition conditions. Despite having the highest aspect ratio and growth rate of ZnO NRs, which were found at 4 h growth duration for both methods, the aspect ratio of ZnO NRs using the M-CBD technique was comparatively higher than the conventional CBD method. Besides, the UV PDs fabricated by the M-CBD method at 5 V bias voltage showed high sensitivity, short response time, quick recovery time, high gain, low dark current, and high photocurrent compared with the UV PD device fabricated by the conventional CBD method.

Second harmonic generation of femtosecond pulses using ZnO nanorods grown by chemical bath deposition with drop casted seed layer

2016 ◽  
Vol 25 (03) ◽  
pp. 1650029 ◽  
Author(s):  
R. Panda ◽  
S. Bhattacharya ◽  
R. Samal ◽  
A. Singh ◽  
P. K. Sahoo ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Chemical Bath Deposition ◽  
Harmonic Generation ◽  
Seed Layer ◽  
Second Harmonic ◽  
Low Cost ◽  
Zno Nanorods ◽  
Fs Laser ◽  
Cbd Method ◽  
Very High

We report efficient second harmonic generation (SHG) of femtosecond (fs) pulses using ZnO nanorods grown by chemical bath deposition (CBD) method with drop-casted seed layer. The SHG behavior of the nanorods are tested using an amplified Ti:sapphire fs laser of pulse duration of 100[Formula: see text]fs at 800[Formula: see text]nm. The SHG signal from the ZnO nanorods is found to be of very high intensity as detected by a low cost, compact spectrometer. In a comparative study, the SHG signal from ZnO nanorods grown over seed layer is found to be 12 times higher than the SHG signal observed from the ZnO nanorods grown on substrate without any seed layer. The efficient SHG in former case is due to the growth of high density, well oriented nanorods whereas the lower signal in the later case is due to growth of low density, randomly oriented nanorods. The polarization dependence behavior of the SHG signal is studied both experimentally and theoretically.

Substrate templated synthesis of single-phase and uniform Zr-porphyrin-based metal–organic frameworks

2020 ◽  
Vol 7 (1) ◽  
pp. 221-231
Author(s):  
Seong Won Hong ◽  
Ju Won Paik ◽  
Dongju Seo ◽  
Jae-Min Oh ◽  
Young Kyu Jeong ◽  
...  
Keyword(s):  
Chemical Bath Deposition ◽  
Single Phase ◽  
Metal Organic Frameworks ◽  
Templated Synthesis ◽  
Pore Structures ◽  
Phase Pure ◽  
Metal Organic ◽  
Cbd Method

We successfully demonstrate that the chemical bath deposition (CBD) method is a versatile method for synthesizing phase-pure and uniform MOFs by controlling their nucleation stages and pore structures.

Anisotropic Nanostructure ZnO Photoelectrodes for CdS/CdSe Quantum Dot Sensitized Solar Cells

2013 ◽  
Vol 873 ◽  
pp. 556-561
Author(s):  
Jian Jun Tian
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Quantum Dot ◽  
Chemical Bath Deposition ◽  
Cdse Quantum Dots ◽  
Silar Method ◽  
Nanorods Array ◽  
Cdse Quantum Dot ◽  
Cbd Method ◽  
Sensitized Solar Cells

CdS/CdSe quantum dots co-sensitized solar cells (QDSCs) were prepared by combining the successive ion layer absorption and reaction (SILAR) method and chemical bath deposition (CBD) method for the fabrication of CdS and CdSe quantum dots, respectively. In this work, we designed anisotropic nanostructure ZnO photoelectrodes, such as nanorods/nanosheets and nanorods array, for CdS/CdSe quantum dots co-sensitized solar cells. Our study revealed that the performance of QDSCs could be improved by modifying surface of ZnO to increase the loading of quantum dots and reduce the charge recombination.

Growth of Rutile TiO2 Nanorods by Chemical Bath Deposition Method on Silicon Substrate at Different Annealing Temperature

2014 ◽  
Vol 624 ◽  
pp. 129-133 ◽  
Author(s):  
Abbas M. Selman ◽  
Zainuriah Hassan
Keyword(s):  
Optical Properties ◽  
Chemical Bath Deposition ◽  
Visible Region ◽  
Annealing Treatment ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Rutile Structure ◽  
Uv Emission ◽  
Cbd Method ◽  
P Type

Effects of annealing treatment on growth of rutile TiO2nanorods on structural, morphological and optical properties of TiO2nanorods were investigated. The nanorods were fabricated on p-type (111)-oriented silicon substrates and, all substrates were seeded with a TiO2seed layer synthesized by radio-frequency reactive magnetron sputtering system. Chemical bath deposition (CBD) was carried out to grow rutile TiO2nanorods on Si substrate at different annealing temperatures (350, 550, 750, and 950 °C). Raman spectroscopy, X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) analyses showed the tetragonal rutile structure of the synthesized TiO2nanorods. Optical properties were examined by photoluminescence spectroscopy. The spectra exhibit one strong UV emission peak which can be seen at around 390 nm for all of the samples. In the visible region, TiO2demonstrated two dominant PL emissions centered at around 519 and 705 nm. The experimental results showed that the TiO2nanorods annealed at 550 °C exhibited the optimal structural properties. Moreover, the CBD method enabled the formation of photosensitive, high-quality rutile TiO2nanorods with few defects for future optoelectronic nanodevice applications.

scholarly journals Phytoremediation of Special Metals in Emerging Industries

2018 ◽  
Vol 1 (3) ◽  
Author(s):  
T Y TEH ◽  
Min-Hao Wu ◽  
Kf Chen ◽  
Yp Peng
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Growth Rate ◽  
Environmental Factors ◽  
Contaminated Soil ◽  
Morphological Analysis ◽  
Energy Crop ◽  
Emerging Industries ◽  
Incremental Growth ◽  
Conventional Methods

This project is carried out to assess the remediation effect on soil contaminated by molybdenum (Mo), one of heavy metals, through the use of an energy crop, sunflowers. This project explores the integration of phytohormones and chelates in the phytoremediation of soils contaminated by heavy metals, and further assesses the operational measures of remedying heavy-metal contaminated soil with sunflowers, in addition to the related environmental factors. Then the project explores phytohormones and heavy metals on the growth scenario explants (explants morphological analysis) through the experiment. The results indicate that GA3 can increase the growth rate of the plants. The average incremental growth of the heavy-metal-added-only group is 21.0 cm; of the GA3-added group it is 21.9 cm; of the EDDS-added group, it is 20.3 cm; of the GA3+ EDDS-added group, it is 21.7 cm. Compared with the conventional methods of phytoremediation, these integrated measures can actually spur the growth of plants. 

scholarly journals ZnO nanorods/graphene oxide sheets prepared by chemical bath deposition for volatile organic compounds detection

2017 ◽  
Vol 696 ◽  
pp. 996-1003 ◽  
Author(s):  
Beatriz A. Vessalli ◽  
Cecilia A. Zito ◽  
Tarcísio M. Perfecto ◽  
Diogo P. Volanti ◽  
Talita Mazon
Keyword(s):  
Graphene Oxide ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Chemical Bath Deposition ◽  
Zno Nanorods ◽  
Volatile Organic ◽  
Graphene Oxide Sheets

Recharacterization of Subsurface Flaw to Surface Flaw Based on Equivalent Fatigue Crack Growth Rate

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Valery Lacroix ◽  
Yinsheng Li ◽  
Bohumir Strnadel ◽  
Kunio Hasegawa
Keyword(s):  
Growth Rate ◽  
Stress Intensity Factor ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Point Of View ◽  
Surface Flaw ◽  
Aspect Ratios ◽  
Crack Growth Rates ◽  
Factor Interaction

A subsurface flaw located near a component surface is transformed to a surface flaw in accordance with a flaw-to-surface proximity rule. The recharacterization process from subsurface to surface flaw is adopted in all fitness-for-service (FFS) codes. However, the criteria of the recharacterizations are different among the FFS codes. In addition, the proximity factors in the rules are generally defined by constant values, irrespective of flaw aspect ratios. This paper describes the stress intensity factor interaction between the subsurface flaw and component free surface and proposes a proximity factor from the point of view of fatigue crack growth rates.

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