scholarly journals In Situ Growth of ZnO Nanostructures on Cotton Fabric by Solochemical Process for Antibacterial Purposes

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
D. A. R. Souza ◽  
M. Gusatti ◽  
R. Z. Ternus ◽  
M. A. Fiori ◽  
H. G. Riella
Keyword(s):  
Electron Microscopy ◽  
Cotton Fabric ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
In Situ Growth ◽  
Zinc Oxide Nanostructures ◽  
Gram Positive Bacteria ◽  
Transmission Electron

A practical and economical method was developed for the production of an antibacterial cotton fabric using zinc oxide nanostructures without the use of surface modifying agents. In this process, zinc nitrate hexahydrate and potassium hydroxide were used as starting materials and the reaction was performed at 50°C. The in situ growth of ZnO nanostructures on cotton fabric occurred in a single-stage process, and it started when the fabric samples were dipped for 1 min in the solution containing all the starting materials. The treated and untreated fabric samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and EDS. The cotton fabrics coated with ZnO nanostructures presented an antibacterial efficiency towards Pseudomonas aeruginosa, a gram-negative bacteria, and Staphylococcus aureus (S. aureus), a gram-positive bacteria.

Two-different ways of synthesis for EG: Study of mechanical, thermal, and electrical properties of epoxy composite for TIMs

2020 ◽  
pp. 095400832094538
Author(s):  
Sagar Kumar Nayak ◽  
Arjyama Mishra ◽  
Subhransu S Pradhan ◽  
Jyoti Agarwal
Keyword(s):  
Electron Microscopy ◽  
Epoxy Composite ◽  
Expanded Graphite ◽  
Ammonium Persulfate ◽  
Zinc Nitrate ◽  
Electrochemical Process ◽  
Graphite Flake ◽  
Nitrate Hexahydrate ◽  
Transmission Electron ◽  
Inverse Rule

The current study reports the synthesis of expanded graphite (EG) in two different ways and its fabrication with epoxy matrix to form composite at various filler fractions (5, 10, 12.5). One type EG (EG-C) is prepared by the electrochemical process using natural graphite flake (NGF), concentrated sulfuric acid, and ammonium persulfate, while the other (EG-P) is just mixing and heating of NGF with zinc nitrate hexahydrate. The functional groups of synthesized EG were confirmed by Fourier transform infrared spectroscopy. The surface morphology and microstructure of synthesized filler (EG-C, EG-P) were studied using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. An optimum through-plane thermal conductivity (TC) of 2.04 and 2.22 W/mK was observed in the case of the composites containing 12.5 wt% of EG-C and EG-P, respectively. The obtained experimental TC was compared with three numerical thermal models, that is, inverse rule of mixture, Maxwell–Eucken model, and Agari model. Furthermore, the thermal stability of both composites was compared by using a thermogravimetric analyzer. The electrical resistivity of EG-P/epoxy composite at different formulations was higher than the EG-C-filled epoxy composites.

In Situ Growth of Si Nanowires Using Transmission Electron Microscopy

2013 ◽  
Vol 58 (8) ◽  
pp. 105-111
Author(s):  
Y.-C. Chou ◽  
C.-Y. Wen ◽  
M. C. Reuter ◽  
D. Su ◽  
E. A. Stach ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
In Situ Growth ◽  
Si Nanowires ◽  
Transmission Electron

Characterization of Urea versus HMTA in the Preparation of Zinc Oxide Nanostructures by Solution-Immersion Method Grown on Gold-Seeded Silicon Substrate

2011 ◽  
Vol 364 ◽  
pp. 45-49 ◽  
Author(s):  
Azlinda Ab Azlinda ◽  
Zuraida Khusaimi ◽  
Saifollah Abdullah ◽  
Mohamad Rusop
Keyword(s):  
Zinc Oxide ◽  
Silicon Substrate ◽  
High Surface ◽  
High Surface Area ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Immersion Method ◽  
Oxide Nanostructures

Zinc oxide (ZnO) nanostructures prepared by immersion method were successfully grown on gold-seeded silicon substrate using Zinc nitrate hexahydrate (Zn (NO3)2.6H2O) as a precursor, separately stabilized with non-toxic urea (CH4N2O) and hexamethylene tetraamine (HMTA). The effect of changing the stabilizer of ZnO solution on the crystal structure, morphology and photoluminescence properties of the resultant ZnO is investigated. X-ray diffraction of the synthesized ZnO shows hexagonal zincite structure. The morphology of the ZnO was characterized using Field Emission Scanning Electron Microscope (FESEM). The growth of ZnO using urea as stabilizer shows clusters of ZnO nanoflower with serrated broad petals were interestingly formed. ZnO in HMTA showed growth of nanorods. The structures has high surface area, is a potential metal oxide nanostructures to be develop for optoelectronic devices and chemical sensors. The formation of ZnO nanostructures is found to be significantly affected by the stabilizer.

Influence of Ammonium in Zinc Oxide Nanostructures Hydrothermally Grown on Glass Substrate

2014 ◽  
Vol 709 ◽  
pp. 341-345
Author(s):  
Concepción Mejía-García ◽  
Elvia Díaz-Valdés ◽  
Marco Alberto Ayala-Torres ◽  
Alejandro Sánchez-Sánchez ◽  
Ana María Paniagua-Mercado ◽  
...  
Keyword(s):  
Zinc Acetate Dihydrate ◽  
Hydrothermal Process ◽  
Zinc Nitrate ◽  
Morphological Properties ◽  
Ammonium Concentration ◽  
Heating Process ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Glass Substrates

We present the synthesis of ZnO nanostructures grown by the hydrothermal method using the rapid microwave heating process. First, 10 mM solutions of zinc acetate dihydrate and 1-propanol were three cycles spin coated on glass substrates at 2000 rpm by 70 s, 90 s and 90 s, respectively. Second, nanostructures were then grown by dipping the substrates in a solution of zinc nitrate hexahydrate, polyethyleneimine (PEI), hexamethylenetetramine and ammonia. The hydrothermal process were carried out with a commercial microwave at 300, and 600 W power settings during 20 min. The structural and morphological properties were investigated using X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The influence of the ammonium concentration in the morphology of the nanostructures was analyzed.Keywords: ZnO, nanostructures, XRD, SEM, spin coating, ammonium, hydrothermal process.

scholarly journals Special Effect of Urea as a Stabilizer in Thermal Immersion Method to Synthesis Porous Zinc Oxide Nanostructures

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
F. S. Husairi ◽  
Syahirah Mhd Ali ◽  
A. Azlinda ◽  
M. Rusop ◽  
S. Abdullah
Keyword(s):  
Zinc Nitrate ◽  
Synthesis Process ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Immersion Method ◽  
Special Effect ◽  
Zno Nanostructure ◽  
Oxide Nanostructures ◽  
P Type

ZnO nanostructure was prepared by catalytic immersion method (90°C) with zinc nitrate hexahydrate (Zn(NO3)26H2O) as a precursors and urea (CH4N2O) as a stabilizer. Different molarity concentration ratio of Zn(NO3)26H2O to CH4N2O, 2 : 1, 1 : 4, 1 : 6, and 1 : 8 is used in this work. The effect of urea concentration used during the synthesis process is discussed. The ZnO nanostructures were characterized by using field emission scanning electron microscope (FESEM), photoluminescene (PL), andI-Vprobe. Porous nanoflakes are successfully synthesized on p-type silicon substrate coated with gold layer with different size and dimension. High intensity photoluminescence (PL) at optimum concentration indicated that urea is good stabilizer to produce ZnO nanostructures with good crytallinity. Rectifying characteristics show dramaticaly change in turn-on voltage when the concentration of urea increases in aqueous solution. This is related to the theory about p-type doping of ZnO nanostructures by nitrogen from NH3.

Effect of Urea as a Stabiliser in the Thermal Immersion Method to Synthesise Zinc Oxide Nanostructures on Porous Silicon Nanostructures

2013 ◽  
Vol 832 ◽  
pp. 644-648 ◽  
Author(s):  
F.S. Husairi ◽  
Kevin Alvin Eswar ◽  
Azlinda Ab Aziz ◽  
Mohamad Rusop ◽  
Saifollah Abdullah
Keyword(s):  
Porous Silicon ◽  
Electrochemical Etching ◽  
Zinc Nitrate ◽  
Synthesis Process ◽  
Silicon Nanostructures ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Immersion Method ◽  
P Type

In this work, ZnO nanostructures were prepared using the catalytic immersion method (90 °C) with zinc nitrate hexahydrate (Zn (NO3)26H2O) as a precursor, urea (CH4N2O) as a stabiliser and porous silicon nanostructures (PSi) as a substrate. PSi prepared on p-type Si by using electrochemical etching method. Different molarity concentration ratios of Zn (NO3)26H2O to CH4N2O (2:1, 1:2, 1:4 and 1:6) were used in this work. The effects of the urea concentration during the synthesis process were discussed. The ZnO nanostructures were characterised using field emission scanning electron microscope (FESEM), photoluminescence (PL) and I-V probe. Porous nanoflakes were successfully synthesised on a p-type PSi substrate that was prepared by electrochemical etching. High-intensity photoluminescence (PL) at the optimum concentration indicated that urea is a good stabiliser to produce ZnO nanostructures with good crystallinity. The high resistance of ZnO/PSi show that electrical properties of PSi dominant compare to ZnO nanostructures.

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