Ali Khorsand Zak

Ali Khorsand Zak
Esfarayen University of Technology

PhD

About

119
Publications
113,788
Reads
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8,337
Citations
Additional affiliations
September 2013 - June 2019
Esfarayen University of Technology
Position
  • Professor (Associate)
April 2013 - April 2014
Malaysia-Japan International Institute of Technology (MJIIT)
Position
  • PostDoc Position

Publications

Publications (119)
Article
This study investigates the antibacterial activity and spectral characteristics of Cu-doped ZnO nanoparticles synthesized via the gelatin-based sol-gel method, focusing on their potential biomedical applications. Zn₁₋ₓCuₓO nanoparticles (x = 0.0, 0.01, 0.03, and 0.05) were fabricated using this method. The incorporation of copper dopants into the Z...
Article
The Size-Strain Plot (SSP) method has been modified and optimized for improved X-ray diffraction (XRD) analysis, particularly focusing on its application in probing the structural properties of pure and Ca-doped zinc oxide nanoparticles (Zn1 − xCaxO, x = 0.0: ZnO, x = 0.01: ZCa1, x = 0.03: ZCa3, x = 0.05: ZCa5). Zn1 − xCaxO nanoparticles were synth...
Article
The piezoelectric property was found by Curie brothers in quartz and Rachel salt (1881). This property is a complicated phenomenon that makes it challenging to study. In 1935, the piezoelectric properties of potassium-dehydrogenated phosphate, the first famous piezoelectric material, were determined. Study about these properties of materials was de...
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In this study, nano- and micro- Ba1 − xCaxTiO3 powders (where x = 0, BT; 0.01, BCT1; 0.03, BCT3; and 0.05, BCT5) were synthesized through the sol–gel and solid-solution-reaction methods, respectively. The effects of synthesis methods and Ca concentrations on the prepared BCT samples’ structural and dielectric properties were subsequently investigat...
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Designing bone substitute scaffolds using soft materials with appropriate mechanical and biological features is still a challenging issue. In our current work, we have aimed to design biodegradable and bioactive nanocomposite systems by incorporation of ordered mesoporous SiO2–CaO–P2O5 (MBG) in chitosan-gelatin (CG) blends. MBG was derived by the c...
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The novel radiotracer has been studied with the title of Graphene quantum dots (GQDs) and decorated by the usage of selenium (Se), while surface modification has been carried out in the following through the utilization of Polyethylene glycol (PEG) and labeled with 99mTechnetium (99mTc). Moreover, 99mTc has been eluted from a ⁹⁹Mo/99mTc producer, a...
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The main objective of this work is gamma-ray attenuation evaluation of PbCu 3 Ti 4 O 12 ceramic with high temperature and electronic current resistance, less toxic and harmful properties than those of lead to suggest a new ceramic with high radiation resistance to design the infrastructures of gamma shielding. So that, the vital parameters of gamma...
Article
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GQDs decorated with europium (Eu), silver (Ag) and selenium (Se) at molar ratios of 0.1%, 0.3% and 0.5% were produced for the first time at different temperatures of 180 °C, 200 °C and 220 °C. Surface passivation was carried out with polyethylene glycol (PEG) to increase the intensity of photoluminescence (PL) of the produced samples. The prepared...
Article
Graphene quantum dots (GQDs) was synthesized using a simple, rapid and affordable method and decorated with selenium at different molar ratios for the first time to obtain an efficient sample for use in photodynamic therapy. Surface modification of GQDs was carried out using polyethylene glycol (PEG) for conjugation with protoporphyrin IX (PpIX). S...
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In this research, the effect of PVP on magnetic properties and morphology of Fe3O4 nanoparticle (Fe3O4-NPS) is investigated. Also, the sensitivity of the humidity of the selected Fe3O4-NPS is studied. X-ray diffraction (XRD), transmission electron microscope (TEM), and vibration sample magnetometer (VSM) were used to characterize the synthesized Fe...
Article
Titanium dioxide/graphene oxide thin 􀀕lms at different concentration of graphene oxide (0.0, 0.015, 0.030, 0.045 and 4.5 g/mL) were prepared by spin coating method. Characterization of the samples was performed using X-ray diffraction and 􀀕eld emission scannig electron microscope and atomic force microscope. X-ray diffraction results showed that by...
Article
The main objective of the present study is the synthesis of yellow nanopigments with antibacterial properties that are suitable to paint humid places. Bismuth doped zinc oxide nanopigments were prepared through a gelatin based sol gel root. The nanopigment powders were obtained through the calcination of the prepared gels at 600 °C for 2 h. The syn...
Article
ZnO is a unique semiconductor that used for various applications. The preparation method, crystal morphology and particle size have important role in its physical properties. This article reviews the structural, morphology and optical properties of zinc oxide nanostructures grown up by different synthesis methods. The effect of adding various impur...
Article
In this paper, reduced graphene oxide nanosheets decorated with silver nanoparticles (AgNPs/rGO) were prepared by a wet chemical method. In this method, graphene oxide (GO), silver nitrate, and ammonia were used as a precursor. AgNPs/rGO composite was characterized by UV–Vis spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, Fourier-transfo...
Article
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In this work, a series of Al-doped ZnO nanoparticles-reduced graphene oxide (AZO–RGO) nanocomposites were successfully synthesized by loading AZO nanoparticles (AZO NPs) on the graphene oxide sheets via in situ and low temperature solvothermal method. Several techniques were utilized to characterize the resultant nanocomposites including scanning e...
Article
The photovoltaic performances of ZnO-based dye-sensitized solar cells (DSSCs) were studied using ZnO nanoparticles prepared via the sol–gel method in gelatin medium at different calcination temperatures. The effects of the calcination temperature on the size, surface area, photoluminescence properties, and dye adsorption ability of ZnO nanoparticle...
Article
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Lead-free sodium niobate (NaNbO3, NN) and potassium niobate (KNbO3, KN) nanopowders were successfully synthesized by a simple and green synthesis process in gelatin media. Gelatin, which is a biopolymer, was used as stabilizer. In order to determine the lowest calcination temperature needed to obtain pure NN and KN nanopowders, the produced gels we...
Article
Zn1-xMoxO (x=0.0, 0.01, 0.03, and 0.05) nanoparticles (NPs) are synthesized by using gelatin, via the sol-gel method. A calcination temperature of 600°C is maintained for 2h. The influence of molybdenum concentration on the structural and optical properties of these NPs is demonstrated. Synthesized NPs are characterized using X-ray diffraction (XRD...
Article
Zinc-doped cerium oxide nanoparticles (Zn-doped CeO2-NPs) with Ce1-xZnxO2 composition, where x equals to 0.0, 0.01, 0.03, and 0.05 are synthesized through a green based sol–gel method from nitrate precursors and gelatin at the fixed calcination temperature of 600 °C maintained for 2 h. The powder X-ray diffraction (PXRD) patterns displayed the sing...
Article
Ceramics of CaCu3-xCoxTi4O12 (CCCTO, x = 0, 0.2, 0.4 and 0.6), with cubic lattice structure, were fabricated using a semi-wet method. The dielectric properties of the prepared samples were studied at 1 kHz frequency in the temperature range of 300–600 K, as well as in the frequency range of 50 Hz–200 kHz at room temperature. The results showed that...
Article
In this paper, we report on the synthesis of Ce(1−x)ZrxO2 yellow nanopigments (NPs) by a simple green sol-gel method, using gelatin as the stabilization and polymerization agent. Thermogravimetric analysis (TGA) was employed to obtain the optimum gel calcination temperature. The synthesized Ce(1−x)ZrxO2 powders were characterized by X-ray diffracti...
Article
In the present study, SnO2 nanosheets were synthesized via a sol-gel method, where gelatin was employed as the natural polymerization agent. The calcination temperature variables such as 650, 700, and 750 °C were found to influence the resultant optical and structural properties. The structural properties of the SnO2 nanosheets were investigated, u...
Article
Undoped and gallium-doped ZnO nanoparticles, (ZnO NPs) (Zn1-xGaxO, x=0.0, 0.03, 0.06, 0.09, 0.12, 0.15), were synthesized by a gelatin-based, sol–gel method. Structural and morphological studies of the resulting products were carried out via X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). The XRD results revealed that t...
Article
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Bacterial resistance to antibiotic treatment is an attractive issue. The discovery of new antibiotics often does not respond to the rapidly increasing bacterial resistance and needs innovative approaches to combat bacterial infections. The NPs size-dependent strong anti-bactericidal effect of Zn1−x Fex O is inspected. Iron (Fe)-doped zinc-oxide (Zn...
Article
Aluminum doped ZnO nanoparticles (AZO-NPs)/graphene nanocomposites, with different Al concentrations, were successfully synthesized by a facile one-step solvothermal method at low temperature. SEM and TEM images of the prepared samples indicated that AZO-NPs have been grown and rather well distributed on the surface of graphene sheets. The average...
Article
The use of food and bio-derived products for the synthesis of different nanomaterials is of enormous interest to modern nanobiotechnology. We have developed a simple, novel, “greener”, bio-directed, and low cost method for the synthesis of zinc oxide nanopowders (ZnO–NPs) by using honey as a food and bio-derived product. The prepared ZnO–NPs were c...
Article
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Pure and silver added zinc oxide nanoparticles (ZnO-NPs and ZnO:Ag-NPs) were synthesized through a modified sol-gel method. The prepared samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy. In the XRD patterns, silver diffracted peaks were also observed for the sam...
Article
The dielectric and ferroelectric properties of the ceramic system, Ba(Ti1−x,Zrx)O3, were investigated for compositions 0≤x≤0.2. The primary nanopowders were synthesized using a sol–gel combustion route to obtain the homogenous compounds. X-ray diffraction patterns demonstrated that there was a cubic structure for the prepared nanopowders. The nanop...
Article
(K0.5N0.5)NbO3 lead-free nanopowders were synthesized by a modified sol–gel method in different media: gelatin, starch and chitosan, as polymerization and stabilizer agents. The proper temperature needed for calcinating the prepared gel was obtained using thermogravometric analysis (TGA). Structural and optical properties of the prepared powders we...
Chapter
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Metal chalcogenide hierarchical nanostructures as energy conversion devices were studied in this chapter. Cd-chalcogenide nanostructures were chosen as sample study due to their unique properties as energy converter. In the first step, different methods were introduced to grow this type of nanostructures. It was discussed three low cost-effective...
Article
Potassium sodium niobate nanopowders (KNN-NPs) were successfully synthesized by a modified sol-gel method, using starch as the stabilization and polymerization agent. Thermogravometric analysis (TGA) and differential thermal analysis (DTA) techniques were used to determine the needed temperature for the calcination of the prepared gels which is obt...
Article
Fe50Ni50 nanocrystalline alloys were prepared by mechanical alloying method at different milling times of 2, 5, 10, 30, 50 and 70 h and ball powder ratios (BPR) of 10 : 1, 20 : 1 and 30 : 1. The structures of prepared powders were studied by X-ray diffraction (XRD). The broadening of the diffraction peaks were analysed using size strain plot (SSP)...
Article
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Pure zinc oxide and zinc oxide/barium carbonate nanoparticles (ZnO-NPs and ZB-NPs) were synthesized by the sol–gel method. The prepared powders were characterized by X-ray diffraction (XRD), ultraviolet–visible (UV–Vis), Auger spectroscopy, and transmission electron microscopy (TEM). The XRD result showed that the ZnO and BaCO3 nanocrystals grow in...
Article
Single-crystal, lead-oxide nanoparticles (PbO-NPs) were synthesized via the sol–gel method in a gelatin medium. Long-chain gelatin compounds were utilized to terminate the growth of the PbO-NPs and to stabilize them. The gel that was obtained was calcined at 500, 550, and 600 1C for 1 h. The synthesized PbO-NPs were characterized using an X-ray dif...
Article
Pure and X-doped (X = Fe, Ni, and Co) PZT nanoparticles (PZT-NPs) were synthesized by a sol-gel combustion method. The structural characterization of the obtained pure and doped PZT-NPs was carried out by X-ray diffraction (XRD). The crystallite size of the prepared samples was then evaluated by the size strain plot (SSP) method using the XRD resul...
Article
Undoped and group-I elements doped ZnO nanowires were synthesized using a thermal evaporation method. Field emission scanning electron microscopy (FESEM) results showed that, the undoped ZnO nanowires were ultra-long with uniform diameters. On the other hand, the length of the doped ZnO nanowires was in the range of some hundred of nanometers. X-ra...
Article
Full-text available
The use of natural polymers in the synthesis of nanomaterials can have a low cost and eco-friendly approach. In this work we would like to report the "green chemistry" synthesis of ZnO nanopowders (ZnO-NPs) using gelatin. Spherical ZnO-NPs were synthesized at different calcination temperatures and field emission scanning electron microscopy (FESEM)...
Article
Undoped and group-I elements doped ZnO nanowires were synthesized using a thermal evaporation method. Field emission scanning electron microscopy (FESEM) results showed that, the undoped ZnO nanowires were ultra-long with uniform diameters. On the other hand, the length of the doped ZnO nanowires was in the range of some hundred of nanometers. X-ra...
Article
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Green and Biological synthetic methods for preparing of different nanoparticles (e.g., metal and metal oxide) using microorganisms, enzymes, and plant extracts have been suggested as a possible low cost and eco-friendly alternative to chemical and physical methods. In this paper, we would like to report the green and biosynthesis of nanoceria parti...
Article
ZnO micro and nanostructures were grown on copper coated silicon substrates using two different systems: an opened system (both ends opened tube) and a closed system (one closed end tube). The thermodynamic conditions of the systems made a significant difference in boundary layer and super-saturation between the systems. The results indicate that d...
Article
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Crystalline nanoceria powders have been synthesized by green-mediated sol gel method in aqueous solution. The cerium nitrate hexahydrate as precursor and starch were taken in water and precipitated with ammonium hydroxide at pH 10. To terminate the growth of nanoceria particles and also to stabilize them, long-chain starch molecules were utilized....
Article
Single-crystal, lead-oxide nanoparticles (PbO-NPs) were synthesized via the sol–gel method in a gelatin medium. Long-chain gelatin compounds were utilized to terminate the growth of the PbO-NPs and to stabilize them. The gel that was obtained was calcined at 500, 550, and 600 1C for 1 h. The synthesized PbO-NPs were characterized using an X-ray dif...
Article
Colloidal gold nanoparticles (Au-NPs) were successfully prepared using a nanosecond-pulsed Nd:YAG laser, λ = 1,064 nm, with laser fluence of approximately about 360 mJ/pulse, in an aqueous gelatin solution. In this work, gelatin was used as a stabilizer, and the size and optical absorption properties of samples were studied as a function of the las...
Article
Undoped and Ag-doped ZnO nanoparticles (NPs) (Zn1-xAgxO, where x= 2%, 4%, 6%) were synthesized by a sol-gel method. The synthesized undoped ZnO and Zn1-xAgxO-NPs were characterized by X-ray diffraction analysis (XRD), transmission electron microscopy (TEM), Raman spectroscopy, and UV-visible spectroscopy. The XRD patterns revealed that the undoped...
Article
Undoped and Pb-doped ZnO nanowires with different lead concentrations were grown on Si(111) substrates using a thermal evaporation method. Scanning electron microscopy (SEM) results showed that, the undoped ZnO nanowires were well aligned with uniform diameters and lengths. On the other hand, the Pb-doped ZnO nanowires were tapered and not aligned...
Article
The use of plant extract in the synthesis of nanomaterials can be a cost effective and eco-friendly approach. In this work we report the "green" and biosynthesis of zinc oxide nanoparticles (ZnO-NPs) using gum tragacanth. Spherical ZnO-NPs were synthesized at different calcination temperatures. Transmission electron microscopy (TEM) imaging showed...
Article
Potassium sodium niobite nanoparticles (KNN-NPs) were synthesized using sol-gel method. A solution of K, Na, and Nb cations was prepared using gelatin as a stabilizer which resulted a clear gel after thermal treatment. The obtained gel was first analyzed by thermogravometric analyzer (TGA) and differential scanning calorimetry (DSC) and then calcin...
Article
Stannic oxide nanostructured sheets (SnO2-NS) were synthesized via a simple sol-gel method. Stannous chloride (SnCl2) was used as a starting material and gelatin as a stabilizer. The structures of the prepared samples were characterized by X-ray diffraction (XRD) analysis and Raman spectroscopy. The results showed that the SnO2-NS were crystallized...
Article
Undoped and Li-doped ZnO nanowires were grown on Si (111) substrates using a thermal evaporation method. Undoped and Li-doped ZnO nanoparticles, which were prepared using a sol-gel method, were used as material sources to grow the undoped and Li-doped ZnO nanowires, respectively. X-ray diffraction patterns clearly indicated hexagonal structures for...
Article
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One of the most important problems in dentistry is the microleakage, whether apical or coronal, which may cause failure of root canal therapy. The aim of this study is to prepare suitable sealer to decrease the microleakage of the root canals as well as having good antibacterial property. Pure ZnO and ZnO:Ag nanopowders were synthesized via sol gel...
Article
Cerium oxide nanoparticles (CeO 2 -NPs) were synthesized via the sol–gel method in gelatin media. Long-chain gelatin compounds were utilized to terminate the growth of CeO 2 -NPs and stabilize them. The CeO 2 -NPs were characterized by a number of techniques, including X-ray diffraction analysis (XRD), UV–vis spectrophotometry, and high-magnificati...
Article
Undoped and Mg-doped ZnO nanoparticles (NPs) (Zn 1 � x Mg x O, x ¼ 0.01, 0.03, and 0.05) were grown by the sol–gel method. X-ray results showed that the products were crystalline with a hexagonal wurtzite phase. Microscopy studies revealed that the undoped ZnO NPs and Zn 1 � x Mg x O NPs had nearly spherical and hexagonal shapes. The size–strain pl...
Article
In this paper, we report fabrication and characterization of ZnO/Ag and ZnO/Au core/shell nanocomposites by 2-hour laser irradiation of the two solutions first containing mixture of ZnO and Ag nanoparticles and second containing ZnO and Au nanoparticles. The process of fabrication was carried out by Nd:YAG second harmonic pulsed laser and the prepa...
Article
ZnO–In 2 O 3 heterostructure nanowires were grown on a Si (111) substrate using the thermal evaporation method. Scanning electron microscopy results showed that the ZnO nanowires had spherical caps. The X-ray diffraction (XRD) pattern and energy-dispersive X-ray (EDX) spectrum indicated that these caps were In 2 O 3 . An analysis of the early growt...
Article
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Colloidal silver nanoparticles (Ag-NPs) were obtained through γ-irradiation of aqueous solutions containing AgNO3 and gelatin as a silver source and stabilizer, respectively. The absorbed dose of γ-irradiation influences the particle diameter of the Ag-NPs, as evidenced from surface plasmon resonance (SPR) and transmission electron microscopy (TEM)...
Article
Undoped and group-I elements doped ZnO nanoparticles (NPs) (Zn 1�y X 2y O, X¼Li, Na, K, and y¼0.05) were synthesized by a sol–gel method. Structural and morphological studies of the resulting products were carried out by X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). The XRD results revealed that the sample products we...
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Plate-shaped zinc oxide nanoparticles (ZnO-NPs) were successfully synthesized by a modified sol–gel combustion method. Zinc acetate, pure water and isopropanol were used as the starting materials. Acetic acid, diethanolamine and nitric acid were used as the polymerization agent, complexing agent and fuel, respectively. The precursors were formed by...
Data
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ZnO nanoparticles (ZnO-NPs) were prepared by a sol–gel combustion method from a zinc acetate precursor and acetic acid. The ZnO-NPs were synthesized at calcination temperatures of 650 °C and 750 °C for 1 h. The synthesized ZnO-NPs were characterized by X-ray diffraction analysis (XRD) and TEM. The XRD results revealed that the sample product was cr...
Article
Zinc oxide nanoparticles (ZnO–NPs) were synthesized via the sol–gel method in starch media. Starch was used as a stabilizer to control of the mobility of zinc cations and then control growth of the ZnO–NPs. Because of the special structure of the starch, it permits termination of the particle growth. Thermogravi- metry analysis (TGA) was applied on...