Author
A. Khorsand Zak
Other affiliations: University of Malaya
Bio: A. Khorsand Zak is an academic researcher from Ferdowsi University of Mashhad. The author has contributed to research in topics: Fourier transform infrared spectroscopy & Wurtzite crystal structure. The author has an hindex of 22, co-authored 44 publications receiving 3380 citations. Previous affiliations of A. Khorsand Zak include University of Malaya.
Papers
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TL;DR: In this paper, the authors used the Williamson-Hall analysis and size-strain plot method to study the individual contributions of crystallite sizes and lattice strain on the peak broadening of ZnO-NPs.
1,784 citations
TL;DR: In this article, plate-shaped zinc oxide nanoparticles (ZnO-NPs) were successfully synthesized by a modified sol-gel combustion method, where zinc acetate, pure water and isopropanol were used as the starting materials.
390 citations
TL;DR: The results confirm that TEA is a suitable polymer agent to prepare homogenous ZnO-NPs.
Abstract: Zinc oxide nanoparticles (ZnO-NPs) were synthesized via a solvothermal method in triethanolamine (TEA) media. TEA was utilized as a polymer agent to terminate the growth of ZnO-NPs. The ZnO-NPs were characterized by a number of techniques, including X-ray diffraction analysis, transition electron microscopy, and field emission electron microscopy. The ZnO-NPs prepared by the solvothermal process at 150°C for 18 hours exhibited a hexagonal (wurtzite) structure, with a crystalline size of 33 ± 2 nm, and particle size of 48 ± 7 nm. The results confirm that TEA is a suitable polymer agent to prepare homogenous ZnO-NPs.
370 citations
TL;DR: It was found that uniform ZnO nanorods with diameter around 50 nm were formed after 15 min of ultrasonication while flowerlike ZNO-NS was formed after 30 min, and this method produces high quality Zn O-NS with controllable shapes, uniformity, and purity.
178 citations
TL;DR: In this article, the authors used long-chain gelatin compounds to terminate the growth of ZnO-NPs and to stabilize them, and the results showed that gelatin is an interesting material that can be used as a stabilizer in the sol-gel technique for preparing small zinc oxide nanoparticles.
175 citations
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TL;DR: In this paper, the development of different strategies to modify TiO2 for the utilization of visible light, including non metal and/or metal doping, dye sensitization and coupling semiconductors are discussed.
Abstract: Fujishima and Honda (1972) demonstrated the potential of titanium dioxide (TiO2) semiconductor materials to split water into hydrogen and oxygen in a photo-electrochemical cell. Their work triggered the development of semiconductor photocatalysis for a wide range of environmental and energy applications. One of the most significant scientific and commercial advances to date has been the development of visible light active (VLA) TiO2 photocatalytic materials. In this review, a background on TiO2 structure, properties and electronic properties in photocatalysis is presented. The development of different strategies to modify TiO2 for the utilization of visible light, including non metal and/or metal doping, dye sensitization and coupling semiconductors are discussed. Emphasis is given to the origin of visible light absorption and the reactive oxygen species generated, deduced by physicochemical and photoelectrochemical methods. Various applications of VLA TiO2, in terms of environmental remediation and in particular water treatment, disinfection and air purification, are illustrated. Comprehensive studies on the photocatalytic degradation of contaminants of emerging concern, including endocrine disrupting compounds, pharmaceuticals, pesticides, cyanotoxins and volatile organic compounds, with VLA TiO2 are discussed and compared to conventional UV-activated TiO2 nanomaterials. Recent advances in bacterial disinfection using VLA TiO2 are also reviewed. Issues concerning test protocols for real visible light activity and photocatalytic efficiencies with different light sources have been highlighted.
3,305 citations
TL;DR: In this paper, the authors used the Williamson-Hall analysis and size-strain plot method to study the individual contributions of crystallite sizes and lattice strain on the peak broadening of ZnO-NPs.
1,784 citations
TL;DR: The main synthesis methods of ZnO nanoparticles, principal characteristics and mechanisms of antimicrobial action as well as the effect of their incorporation in polymeric matrices are discussed in this paper.
Abstract: Zinc oxide (ZnO) is an inorganic compound widely used in everyday applications. ZnO is currently listed as a generally recognized as safe (GRAS) material by the Food and Drug Administration and is used as food additive. The advent of nanotechnology has led the development of materials with new properties for use as antimicrobial agents. Thus, ZnO in nanoscale has shown antimicrobial properties and potential applications in food preservation. ZnO nanoparticles have been incorporated in polymeric matrices in order to provide antimicrobial activity to the packaging material and improve packaging properties. This review presents the main synthesis methods of ZnO nanoparticles, principal characteristics and mechanisms of antimicrobial action as well as the effect of their incorporation in polymeric matrices. Safety issues such as exposure routes and migration studies are also discussed.
977 citations
TL;DR: This review, which examines 'greener' routes to nanoparticles of zerovalent metals, metal oxides, and salts with an emphasis on recent developments, discusses the key materials used in the field: silver, gold, iron, metal alloys, oxides and salts.
778 citations
TL;DR: A review of green and biological synthesis methods of ZnO-NPs and investigation of their biomedical applications is presented in this paper, where the authors summarize the green-and biological-based synthesis methods and their applications.
548 citations