ZnO Nanoparticles: Growth, Properties, and Applications

In book: Metal Oxide Nanostructures and Their Applications, Chapter: 4, Publisher: American Scientific Publishers, pp.1-36
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Available from: Vaseem Mohammad (Ph.D.), Sep 25, 2015
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    • "To develop size and morphology controlled ZnO nanoparticles, synthesis route is of major importance [3]. For instance, Verges et al. [4] synthesized rod-like zinc-oxide nanoparticles obtained from the hydrolysis of zinc nitrate and zinc chloride in the presence of hexamethylenetetramine. "
    Journal of Alloys and Compounds 08/2015; DOI:10.1016/j.jallcom.2015.08.200
    • "Research on ZnO based nanostructures has drawn considerable attention in the last few years as a multi-functional material due to its versatile properties such as UV absorption, near UV and visible (green, blue and violet) emission, optical transparency, electrical conductivity, piezoelectricity, and antibacterial properties [2]. That is why those nanoparticles have a vast area of applications in sensors, drug-delivery, cosmetics, optical and electrical devices, photovoltaic devices and solar cells [3]. "
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    ABSTRACT: Two different methods were used to obtain composite materials based on a ZnO nanoparticles–hydrogel–cotton fabric. The hydrogels, synthesized by photopolymerization, were utilized to provide uniform distribution and binding of the nanoparticles to the fiber surface and to prevent their agglomeration. N-methyldiethanolamine (MDEA) was used as a co-initiator in hydrogel photopolymerization and as an alkaline agent in the synthesis of ZnO nanoparticles. Due to the difference in size, shape and morphology of the nanoparticles, examined by a TEM and SEM, it was found that the materials have distinct photoluminescence properties, e.g. in the entire visible or UV range. The composite materials with small size nanoparticles and photoluminescence in near UV range were investigated for antibiotic activity against the bacterial strains Pseudomonas aeruginosa and Acinetobacter johnsonii known as important pathogens in clinical infections. Significantly high antibacterial effect on the bacteria tested was achieved, especially on A. johnsonii. This suggests potential application of the new formulations as effective wound dressings to control the spread of infections.
    Applied Surface Science 08/2015; 345. DOI:10.1016/j.apsusc.2015.03.141
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    • "Moreover, great interest has focused on the synthesis of ZnO spheres because of their potential applications in paints, ceramics gas sensing, cosmetics, drug delivery, catalysis, chemical storage, microcapsule reactors and photoelectric materials.[8] [9] Evidently, conventional chemical and physical methods used to synthesise ZnO Nps are expensive and often lead to questions of environmental risk because of involving the use of toxic, hazardous and non-friendly chemicals.[10] [11] Accordingly, there is an urgent need to develop environment-friendly procedures for synthesising ZnO Nps.[12] [13] Recently, green approaches using natural sources such as micro-organisms, plants or plant extracts for nanoparticle synthesis were suggested as valuable alternatives to chemical methods.[14À20] "
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    ABSTRACT: A facile green recipe was developed to synthesise highly pure, safe and durable zinc oxide nanoparticles (ZnO Nps) using homemade starch-rich potato extract. The ZnO Nps were synthesised using zinc nitrate and potato extract, and the whole reaction is carried out for 30 min at 80 °C. In the synthesis, starch-rich potato extract acted as the reducing agent and as a stabilising layer on freshly formed ZnO Nps. Hexagonal (wurtzite) shaped ZnO Nps with size about 20 ± 1.2 nm were synthesised and characterised using X-ray diffraction, transition electron microscope and scanning microscopy analyses. Fourier transform infrared spectral analysis indicated that highly pure ZnO nanopowders were obtained at higher temperatures. The use of environmentally benign and renewable material as the respective reducing and protecting agents, starch-rich potato extract, as well as a gentle solvent medium (H2O), offered a simple and quite efficient procedure for the synthesis of ZnO Nps in neutral medium with promising potential for biological and biomedical applications.
    Journal of Experimental Nanoscience 05/2015; DOI:10.1080/17458080.2015.1039610
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