scholarly journals Sprayed Pyrolyzed ZnO Films with Nanoflake and Nanorod Morphologies and Their Photocatalytic Activity

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Nora S. Portillo-Vélez ◽  
Monserrat Bizarro
Keyword(s):  
Photocatalytic Activity ◽  
Large Scale ◽  
Spray Pyrolysis Technique ◽  
Structural Characteristics ◽  
Zno Nanorods ◽  
Volume Ratio ◽  
Precursor Solution ◽  
Synthesis Process ◽  
Zno Films ◽  
Scale Production

There is an increasing interest on the application of ZnO nanorods in photocatalysis and many growth methods have been applied, in particular the spray pyrolysis technique which is attractive for large scale production. However it is interesting to know if the nanorod morphology is the best considering its photocatalytic activity, stability, and cost effectiveness compared to a nonoriented growth. In this work we present a systematic study of the effect of the precursor solution (type of salt, solvent, and concentration) on the morphology of sprayed ZnO films to obtain nanoflakes and nanorods without the use of surfactants or catalysts. The surface properties and structural characteristics of these types of films were investigated to elucidate which morphology is more favorable for photocatalytic applications. Wettability and photocatalytic experiments were carried out in the same conditions. After UV irradiation both morphologies became hydrophilic and achieved a dye discoloration efficiency higher than 90%; however, the nanoflake morphology provided the highest photocatalytic performance (99% dye discoloration) and stability and the lowest energy consumption during the synthesis process. The surface-to-volume ratio revealed that the nanoflake morphology is more adequate for photocatalytic water treatment applications and that the thin nanorods should be preferred over the large ones.

Effect of Molarity of Precursor Solution on Nanocrystalline Zinc Oxide Thin Films

2009 ◽  
Vol 293 ◽  
pp. 99-105 ◽  
Author(s):  
Girjesh Singh ◽  
S.B. Shrivastava ◽  
Deepti Jain ◽  
Swati Pandya ◽  
V. Ganesan
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Solar Cells ◽  
Spray Pyrolysis ◽  
Spray Pyrolysis Technique ◽  
Precursor Solution ◽  
Zno Films ◽  
Scale Production ◽  
Transparent Conducting ◽  
Wide Range

During the last two decades, the use of transparent conducting films of non-stoichiometric and doped metallic oxides for the conversion of solar energy into electrical energy has assumed great significance. A variety of materials, using various deposition techniques, has been tried for this purpose [1-3]. Among these various materials, zinc oxide (ZnO) is one of the prominent oxide semiconductors suitable for photovoltaic applications because of its high electrical conductivity and optical transmittance in the visible region of the solar spectrum [4]. Furthermore, thin films of ZnO have shown good chemical stability against hydrogen plasma, which is of prime importance in a-Si:H-based solar-cell fabrication. Thus, zinc oxide can serve as a good candidate for replacing SnO2 and indium tin oxide (ITO) films in Si:H-based solar cells. One of the outstanding features of ZnO is its large excitonic binding energy, i.e. 60meV, leading to the existence of excitons at room temperature and even at higher temperatures [5-8]. These unique characteristics have generated a wide range of applications of ZnO. For example, gas sensors [9], surface acoustic devices [10], transparent electrodes and solar cells. Many techniques are used for preparing the transparent conducting ZnO films, such as RF sputtering [11], evaporation [12], chemical vapour deposition [13], ion beam sputtering [14] and spray pyrolysis [15–18]. Among these, the spray pyrolysis technique has attracted considerable attention due to its simplicity and large-scale production combined with low-cost fabrication. By using this technique, one can produce large-area coatings without any need for ultra-high vacuum. Thus, the capital cost and the production cost of high-quality zinc oxide semiconductor thin films are lowest among all other techniques. In the present work, we have synthesized ZnO films by using the spray pyrolysis technique. A number of films have been prepared by changing the molarity of the precursor solution. The prepared films have been characterized with regard to their structural, morphological and electrical properties.

scholarly journals Rapid synthesis and characterization of silver-loaded graphene oxide nanomaterials and their antibacterial applications

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Jiang Zhu ◽  
Haitao Ni ◽  
Chunyan Hu ◽  
Yuxiang Zhu ◽  
Jinxia Cai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Large Scale ◽  
Structural Characteristics ◽  
Water Soluble ◽  
Scale Production ◽  
Energy Dispersion Spectroscopy ◽  
Gram Positive Bacteria ◽  
Transmission Electron ◽  
Large Scale Production

With the promising potential application of Ag/graphene-based nanomaterials in medicine and engineering materials, the large-scale production has attracted great interest of researchers on the basis of green synthesis. In this study, water-soluble silver/graphene oxide (Ag/GO) nanomaterials were synthesized under ultrasound-assisted conditions. The structural characteristics of Ag/GO were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy and energy dispersion spectroscopy, respectively. The results showed the silver particles (AgNPs) obtained by reduction were attached to the surface of GO, and there was a strong interaction between AgNPs and GO. The antibacterial activity was primarily evaluated by the plate method and hole punching method. Antibacterial tests indicated that Ag/GO could inhibit the growth of Gram-negative and Gram-positive bacteria, special for the Staphylococcus aureus .

Effect of Aluminum Nitrate Concentration in Zinc Acetate Precursor on ZnO:Al Thin Films Prepared by Spray Pyrolysis

2009 ◽  
Vol 1201 ◽  
Author(s):  
Samerkhae Jongthammanurak ◽  
Sirirak Phakkeeree ◽  
Yot Boontongkong ◽  
Chanchana Thanachayanont
Keyword(s):  
Spray Pyrolysis ◽  
Zinc Acetate ◽  
Spray Pyrolysis Technique ◽  
Zinc Acetate Dihydrate ◽  
Precursor Solution ◽  
Zno Films ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
Aluminium Nitrate Nonahydrate ◽  
Zinc Acetate Precursor

AbstractAluminium-doped zinc oxide (ZnO) films have been prepared by spray pyrolysis technique using the mixed solution of zinc acetate dihydrate and aluminium nitrate nonahydrate in methanol. Concentration of aluminum in the solution was varied in a range of 1, 3 and 5 atomic percents. The results from X-ray diffraction showed that the preferred orientation of ZnO films changed to the [002] direction when the concentration of aluminum in the solution exceeded 1 atomic percents. ZnO films deposited from the 3 atomic percent Al containing solution had the largest grains and showed the lowest resistivity of 75 Ω-cm. Addition of aluminum into the precursor solution shifted the absorption edge towards longer wavelengths.

A facile and versatile method for preparation of colored TiO2 with enhanced solar-driven photocatalytic activity

Nanoscale ◽  
2014 ◽  
Vol 6 (17) ◽  
pp. 10216-10223 ◽  
Author(s):  
Huaqiao Tan ◽  
Zhao Zhao ◽  
Mang Niu ◽  
Chengyu Mao ◽  
Dapeng Cao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Solid State ◽  
Large Scale ◽  
Chemical Reduction ◽  
Photocatalytic Properties ◽  
Scale Production ◽  
Large Scale Production ◽  
State Chemical ◽  
Reduction Approach

A simple and facile solid-state chemical reduction approach for a large-scale production of colored TiO2 with good photocatalytic properties was developed.

Nano-sized boron synthesis process towards the large scale production

2014 ◽  
Vol 256 ◽  
pp. 32-38 ◽  
Author(s):  
Maurizio Vignolo ◽  
Gianmarco Bovone ◽  
Davide Matera ◽  
Davide Nardelli ◽  
Cristina Bernini ◽  
...  
Keyword(s):  
Large Scale ◽  
Synthesis Process ◽  
Scale Production ◽  
Large Scale Production

scholarly journals Manufacturing and Characterization of Customizable Flexible Carbon Nanotube Fabrics for Smart Wearable Applications

Textiles ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 534-546
Author(s):  
Ashley Kubley ◽  
Megha Chitranshi ◽  
Xiaoda Hou ◽  
Mark Schulz
Keyword(s):  
Carbon Nanotube ◽  
Physical Properties ◽  
Smart Materials ◽  
Large Scale ◽  
Consumer Products ◽  
Synthesis Process ◽  
Scale Production ◽  
High Level ◽  
Smart Wearable ◽  
Hybrid Fabric

The integration of carbon nanotube fabric into textiles is paving its way into smart materials and wearable applications. Potential novel applications of carbon nanotube hybrid (CNTH) materials and fabric composites span across a range of market levels from high-level PPE appropriate for military and industrial applications down to consumer products that can be used in everyday scenarios. The high-level performance properties of CNTH materials and their ability to be customized provide new possibilities for constructing fabrics with properties that are made to order. Furthermore, CNTH in combination with advanced textile compositing and construction methods allows the CNTH material to further leverage material customization aspects to meet specific requirements. The unique synthesis process for nanotube fabric allows for modification of the physical properties of the CNTH itself. The CNTH fabric combined with the customizability of standard textile composite materials and with the use of apparel design features allows for the design of materials with new combinations of physical properties. These unique properties offer high potential for developing families of smart wearable garments that can be scaled for industrial production. This article discusses the synthesis of carbon nanotube hybrid fabric, the process of hybrid fabric and textile integration, properties of the hybrid textile, and potential applications. The paper also provides an outlook towards large scale production of the hybrid textile material.

scholarly journals Use of nanoparticles to improve thermochemical resistance of synthetic polymer to enhanced oil recovery applications: a review

2020 ◽  
Vol 10 (2) ◽  
pp. 85-97
Author(s):  
Henderson Ivan Quintero Perez ◽  
Maria Carolina Ruiz Cañas ◽  
Ruben Hernan Castro Garcia ◽  
Arnold Rafael Romero Bohorquez
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Large Scale ◽  
Polymer Concentration ◽  
Molecular Size ◽  
Economic Feasibility ◽  
Chemical Degradation ◽  
Synthesis Process ◽  
Scale Production ◽  
The Impact

Partially Hydrolyzed Polyacrylamide (HPAM) is the polymer most used in chemical enhanced oil recovery (cEOR) processes and it has been implemented in several field projects worldwide. Polymer injection has shown to be an effective EOR process. However, it has not been implemented massively due to HPAM polymer's limitations, mostly related to thermal and chemical degradation caused by exposure at high temperatures and salinities (HTHS). As an alternative, a new generation of chemically stable monomers to improve the properties of HPAM has been assessed at laboratory and field conditions. However, the use of enhanced polymers is limited due to its larger molecular size, large-scale production, and higher costs. One of the alternatives proposed in the last decade to improve polymer properties is the use of nanoparticles, which due to their ultra-small size, large surface area, and highly reactive capacity, can contribute to reduce or avoid the degrading processes of HPAM polymers. Nanoparticles (NPs) can be integrated with the polymer in several ways, it being worth to highlight mixing with the polymer in aqueous solution or inclusion by grafting or chemical functionalization on the nanoparticle surface. This review focuses on hybrid nanomaterials based on SiO2 NPs and synthetic polymers with great EOR potential. The synthesis process, characterization, and the main properties for application in EOR processes, were reviewed and analyzed. Nanohybrids based on polymers and silica nanoparticles show promising results in improving viscosity and thermal stability compared to the HPAM polymer precursor. Furthermore, based on recent findings, there are great opportunities to implement polymer nanofluids in cEOR projects. This approach could be of value to optimize the technical-economic feasibility of projects by reducing the polymer concentration of using reasonable amounts of nanoparticles. However, more significant efforts are required to understand the impact of nanoparticle concentrations and injection rates to support the upscaling of this cEOR technology.

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