scholarly journals Wet Chemical Preparation of Nanoparticles ZnO:Eu3+ and ZnO:Tb3+ with Enhanced Photoluminescence

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Tran Kim Anh ◽  
Dinh Xuan Loc ◽  
Nguyen Tu ◽  
Pham Thanh Huy ◽  
Le Minh Anh Tu ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Annealing Treatment ◽  
Host Lattice ◽  
Emission Region ◽  
Active Centers ◽  
Wet Chemical Synthesis ◽  
Enhanced Photoluminescence ◽  
Wet Chemical ◽  
Microwave Assistance ◽  
Temperature Time

ZnO doped with Eu3+ and Tb3+ had been successfully prepared by wet chemical method with the assistance of microwave. The influence of reaction conditions such as temperature, time, content of Eu3+, Tb3+ ion, and annealing treatment on the structure and luminescent characteristics was studied. The analysis of energy dispersive spectroscopy (EDS) and photoluminescence spectra measurements indicated that Eu3+ and Tb3+ exist in host lattice and create the new emission region compared to ZnO crystalline host lattice. The field emission scanning electron microscope (FE-SEM) studies show the Eu3+, Tb3+ doped ZnO nanoparticles have a pseudohexagonal shape. The particle size was 30–50 nm for ZnO:Eu3+ and 40–60 nm for ZnO:Tb3+. Photoluminescence excitation (PLE) and photoluminescence (PL) spectra at room temperature have been studied to recognize active centers for characteristic luminescence of ZnO:Eu3+ and ZnO:Tb3+. The characteristic luminescent lines of Eu3+ (5D0-7Fj) and Tb3+ (5D4-7Fj) were determined. It has been demonstrated that the wet chemical synthesis method with microwave assistance can strongly enhance the luminescent intensity of nanoparticles ZnO:Eu3+ in red and ZnO:Tb3+ in green.

scholarly journals Canted antiferromagnetism in high-purity NaFeF3 prepared by a novel wet-chemical synthesis method

2020 ◽  
Vol 4 (11) ◽  
Author(s):  
Fabian L. M. Bernal ◽  
Bruno Gonano ◽  
Fredrik Lundvall ◽  
David S. Wragg ◽  
Helmer Fjellvåg ◽  
...  
Keyword(s):  
Chemical Synthesis ◽  
High Purity ◽  
Synthesis Method ◽  
Wet Chemical Synthesis ◽  
Wet Chemical

Eco-Friendly Synthesis of Silver Nanoparticles Using Carica Papaya Extract for Anti Bacterial Applications

2012 ◽  
Vol 629 ◽  
pp. 279-283 ◽  
Author(s):  
Rameshwar Rao ◽  
C. Shilpa Chakra ◽  
K. Venkateswara Rao
Keyword(s):  
Carica Papaya ◽  
Research Work ◽  
Synthesis Method ◽  
Cost Effective ◽  
Nano Particles ◽  
Environment Friendly ◽  
Wet Chemical Synthesis ◽  
Agno3 Solution ◽  
Wet Chemical ◽  
Synthesis Of Nanomaterials

Nanobiotechnology emerged as integration of nanotechnology and biotechnology for developing bioactive, biosynthetic and eco -friendly technology for synthesis of nanomaterials. Nanostructures have great demand in areas such as chemistry, catalysis, electronics, energy, and medical applications. Metallic nano-particles are normally synthesized by wet chemical synthesis techniques using the toxic and inflammable chemicals. Present research work on preparation of silver nano-particles by green nano synthesis method and has advantages over conventional methods involving chemical agents which can cause environmental toxicity. The synthesis technique is a cost effective and environment friendly technique for green nano synthesis of silver nano-particles from varying concentrations of AgNO3 solution and extract of Carica papaya fruit of different concentrations which acts as reducing and capping agent. Characterizations has been done using UV–Vis absorption spectroscopy, XRD, particle size analyser and SEM with EDX. Antimicrobial activity was done using Escherichia coli and Pseudomonas.

scholarly journals Facile growth of high transmittance ZnO micro-rod clusters on indium tin oxide by a wet-chemical synthesis method

2021 ◽  
Vol 30 ◽  
pp. 263498332110389
Author(s):  
S Morkoç Karadeniz
Keyword(s):  
Chemical Synthesis ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Hexagonal Phase ◽  
Synthesis Method ◽  
Zinc Nitrate ◽  
Synthesis Process ◽  
Nitrate Hexahydrate ◽  
Wet Chemical Synthesis ◽  
Wet Chemical

A simple wet-chemical synthesis method was developed to fabricate Zinc oxide micro-rod clusters. The synthesis process involved the rapid dilution of a zinc-bearing alkaline solution at 150°C in a convection oven on indium tin oxide (ITO) substrates. The synthesis was carried out by immersing an unseeded ITO substrate in a mixture of zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and hexamethylenetetramine ((CH2)6N4) aqueous solution. The obtained sample was annealed at 400°C for 2 h. The structural, morphological and optical properties of the synthesized ZnO microstructures were investigated by X-ray diffraction, scanning electron microscopy and ultraviolet-visible spectroscopy, respectively. The ZnO rod clusters are hexagonal phase of the wurtzite structure. The crystal grain sizes of the films were found to be 72.6, 84.3 and 66.3 nm for the (100), (002) and (101) crystal planes, respectively. The optical bandgap of the ZnO was determined to be 3.147 eV.

Proposed Industrial Scale Setup for Production of ZnO Nanoparticles Using Wet Chemical Synthesis Method

2021 ◽  
Vol 875 ◽  
pp. 146-152
Author(s):  
Muhammad Saquib Ali ◽  
Muhammad Yasir Khan ◽  
Zeeshan Akhtar ◽  
Wasim Akhtar ◽  
Ahsan Muhammad ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Research Work ◽  
Maximum Yield ◽  
Synthesis Method ◽  
Chemical Precipitation ◽  
Flow Diagram ◽  
Precipitation Reaction ◽  
Wet Chemical Synthesis ◽  
Wet Chemical ◽  
Zno Powder

In this study, an industrial method is provided for the synthesis of zinc oxide (ZnO) nanoparticles by a simple and economical wet chemical precipitation reaction between Zinc Chloride (ZnCl2) and Sodium Hydroxide (NaOH) at low temperatures less than 80 °C. In first step, Small quantity of ZnO powder is produced in laboratory scale. As-synthesized lab-scale ZnO powders were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Orthogonal experiments were performed to find out the optimal conditions for the maximum yield of ZnO powder. In second step, the process flow diagram (PFD), material & energy balance and design of reactor were done on the basis of lab-scale data. Overall, this research work proposes that ZnO powder can be manufactured easy and economical method which can be used for various branches of industry: rubber, pharmaceutical, cosmetics, textile, electronic etc.

Solubility of Mn in ZnO Nanocrystallites using Wet Chemical Synthesis

2019 ◽  
Vol 2 (1) ◽  
pp. 53-61
Author(s):  
Esau Abekah Armah ◽  
Francis Kofi Ampong ◽  
Martin Egblewogbe ◽  
Hubert Azoda Koffi ◽  
Francis Boakye ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Magnetic Semiconductor ◽  
Solubility Limit ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Phase Synthesis ◽  
Wet Chemical Synthesis ◽  
Wet Chemical ◽  
Binary Compounds

There is a substantial amount of literature dealing with many aspects of synthesis and characterization of pure and doped binary compounds including Mn-doped ZnO which has been widely studied due to its superb properties as a dilute magnetic semiconductor (DMS). Aspects concerning doping limits for these compounds is an important stage in the search for new materials. Samples of Zn1-xMnxO nanocrystal were synthesized at temperatures of 180 °C and 200 °C using wet or liquid phase synthesis method. Dopant concentrations x=0.5, 1, 1.5, 2, 2.5, 5, 10, 20, 30, 40 and 50 per cent were studied. Powder x-ray diffraction (PXRD) patterns of the samples were analyzed with a view to determining the onset of secondary phases and hence the solubility limit of the dopant. The solubility limit for Mn in ZnO samples synthesized at temperature of 200 °C is realized at x <20%. For samples synthesized at temperature of 180 °C, the solubility limit is x <0.5%.

Effect of Structure and Composition on Ibuprofen Drug Delivery by Calcium Phosphate Nanocarriers

2012 ◽  
Vol 529-530 ◽  
pp. 495-500 ◽  
Author(s):  
K. Madhumathi ◽  
T.S. Sampath Kumar
Keyword(s):  
Calcium Phosphate ◽  
Drug Carrier ◽  
Drug Loading ◽  
Synthesis Method ◽  
Electron Microscopic ◽  
Wet Chemical Synthesis ◽  
Vis Spectroscopy ◽  
Wet Chemical ◽  
Ibuprofen Release ◽  
Effect Of Structure

The effect of structure and composition of calcium phosphate (CaP) nanoparticles namely hydroxyapatite (HA), calcium deficient hydroxyapatite (CDHA) with Ca/P ratio ranging from 1.33 to 1.61 and tricalcium phosphate (β-TCP), on the efficiency of nanoparticles as an ideal drug carrier have been investigated. Ibuprofen, an anti-inflammatory drug was chosen for this study. The CaP nanoparticles were prepared by microwave accelerated wet chemical synthesis method and were characterized by X-ray powder diffraction, infrared spectroscopy, and electron microscopic techniques. The loading and release profiles of ibuprofen from the nanocarriers was studied using UV-Vis spectroscopy. Maximum loading of the drug was observed in β-TCP (75%) followed by CDHA of Ca/P ratio 1.5. Both samples have same Ca/P ratio but have different crystal structure. Low amount of drug loading was observed in HA and other CDHAs which have Ca/P ratio different from 1.5. Although, all the samples exhibits sustained release of ibuprofen for about 7 days, the maximum release was also shown by β-TCP (26%). Among HA and CDHAs, the amount of ibuprofen release increases with increasing Ca/P ratio. The loading and release profile of ibuprofen drug seems to be strongly related to the Ca/P ratio and structure of CaP nanocarriers.

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