Structural, electrical, and antimicrobial characterization of green synthesized ZnO nanorods from aqueous Mentha extract
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Research Letter
Structural, electrical, and antimicrobial characterization of green synthesized ZnO nanorods from aqueous Mentha extract Ercan Karaköse, Department of Automotive Technology, Erciyes University, 38039 Kayseri, Turkey Hakan Çolak, Faculty of Sciences, Department of Chemistry, Çankırı Karatekin University, 18100 Çankırı, Turkey Address all correspondence to Ercan Karaköse at [email protected] (Received 16 November 2017; accepted 23 February 2018)
Abstract We synthesized two types of ZnO nanoparticles (NPs) for comparison, the first NPs were produced using a Zn(Ac)2.2H2O solution in distilled water and the second were produced using a Zn(Ac)2.2H2O solution in an aqueous extract of Mentha (mint). The x-ray diffraction patterns were indexed on the basis of a hexagonal (wurtzite) structure. The samples illustrate the high crystalline quality, and the average crystal sizes of the NPs were calculated to be 50 and 60 nm for GS and NS, respectively. ZnO nanorods were produced for the first time by using green synthesis method.
Introduction ZnO nanoparticles (NPs) have attracted great attention because of their fascinating features and wide implementation. ZnO is one of the most significant n-type semiconductor materials with a direct band gap of 3.37 eV and a large exciton binding energy nearing 60 MeV which creates a rational excitonic emission value.[1,2] ZnO is one of several metal oxide semiconductors which can be utilized in a wide range of technological applications such as solar cells, light emitting diodes, photoelectronic devices, and laser diodes. On the other hand, ZnO has the most varied physical properties and nano grain morphologies among all semiconductors. In the preparation of ZnO-NPs, it has been synthesized by different methods such as chemical vapor deposition (in gaseous media),[3] pulsed laser deposition,[4] ultrasonic spray pyrolysis, magnetron sputtering, sol–gel method (in liquid media, chemical method), [5,6] molecular beam epitaxy and the combustion method (in solid media).[7] Most of these techniques presented in the literature are very costly. They also require the use of hazardous and toxic contents, such as stabilizers, which may create a potential ecological problem and pose health risks. Eco-friendly artificial approaches have become important in recent years. The synthesis of such materials by fabricating biocompatible reagents in an eco-friendly way may help to reduce the need for toxic components used in conventional methods. For this purpose, closed reactors, non-toxic solvents such as water, “green” methods without the need for contacting reaction media and air (ultrasound, microwave, hydrothermal, magnetic, and biologic methods, among others), and low temperatures can be used. The advantages of the green synthesis of NPs are its simplicity, cost-effectiveness, reproducibility, and results in stable materials.
Overall, biologic materials offer an environmentally friendly method to produce such materials.[8,9] Nanosized ZnO can be produced by green synthesis technique.
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