Microwave-Assisted Synthesis of Ultra-Small Silver ..

Silver nanowires (Ag-NWs) were obtained using microwave-assisted hydrothermal method (MAH). The main advantage of the method is its high NWs production which is greater than 90%. It is also easy, fast, and highly reproducible process. One of the drawbacks presented so far in the synthesis of nanostructures by polyol path is the high temperature used in the process, which is superior than the boiling point of solvent (ethylene glycol), and also its excessive reaction time. Here, Ag-NWs with diameters of 70 to 110 nm were synthesized in 5 min in large quantities. Results showed that dimensions and shape of nanowires were very susceptible to changes with reaction parameters. The reactor power and reactor fill capacity were important for the synthesis. It was found that the reaction time needs to be decreased because of the NWs which start to deform and break up due to significant increase in the pressure's system. Energy-dispersive X-ray spectroscopy and electron diffraction analysis (SAED) did not show corresponding phases of AgO. Some aspects about synthesis parameters which are related to the percent yield and size of nanowires are also discussed.

Photochemical Synthesis of Gold Nanorods - Journal of …

Sivaramakrishnan, Microwave assisted green synthesis of MgO nanorods and their ..

Multimodal Bioimaging based on Gold Nanorods and …

Hybrid Ag-ZnO nano-structured microparticles and ZnO hierarchical microparticles were prepared by amicrowave assisted hydrothermal synthesis. Here we present arapid and energy saving one-pot hydrothermal synthesis using amicrowave pressure system. Zinc nitrate and silver nitrate were used as sources of Zn2+ and Ag+. Hexamethylenetetramine (HMTA) was used asa reduction and precipitation agent in water solutions. Crystalline structures of obtained Ag-ZnO and ZnO powders were characterized by an X-ray diffractometer. A scanning electron microscopy was used for the characterization of structure, morphology and particle size of the Ag-ZnO filler. An elemental analysis of the Ag-ZnO filler was made by an Energy dispersive X-ray analysis. The growth mechanism of particles was elucidated. The antibacterial activity was evaluated by an inhibition zone test; one of the materials has shown good antibacterial stability against , and

Journal of Nanoscience and Nanotechnology

Ag-NWs were synthesized by microwave-assisted hydrothermal method (MAH). In this process, silver nitrate (AgNO3), PVP, and ethylene glycol purchased from Sigma Chemicals (St. Louis, MO, USA) were used without further purification. Separate solutions of 0.1 mol/L (AgNO3) and 0.6 mol/L (PVP) were prepared in anhydrous ethylene glycol. Each solution was stirred to complete the dissolution in a dry box under nitrogen atmosphere. Then, they were transferred into a Teflon vessel of 23 mL capacity microwave transparent body autoclave. The reactor was kept closed inside the dry box that was placed inside a conventional oven under a regulated power of 200 to 1,000 W. In order to prevent overpressure inside the reactor, the synthesis process was carried out by power pulses of 1.0 min and relaxation pulses of 0.5 min. The first relaxation pulse was for 0.5 min followed by a 1.0-min pulse. The reaction time to the total time of pulses with power for each treatment was between 5.0 and10 min. At the end of the reaction, the reactor was cooled down to room temperature. Cotton-like appearance was formed at the top of the reactor chamber; this was carefully removed with a spatula and was washed with deionized water and ethanol several times to remove the excess PVP from the Ag-NWs surface. The resulting material was rich in Ag-NWs of size approximately 70 to 110 nm. The residue left at the bottom of the reactor (approximately 5%) was discarded. Reactor power, reactor fill capacity, and molar ratio (PVP: AgNO3) were the parameters carefully considered in the synthesis.

Proposed mechanism for the synthesis of silver nanowires through microwave-assisted ..
01/07/2017 · Gold seed-assisted synthesis of silver nanomaterials under microwave heating

Professor of Clean Technology College of Science and Engineering

This review is concerned with the synthesis of metallic nanoparticles using plant extracts

Advances in Microwave-Assisted Synthesis ..

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Microwave Synthesis of Silver Nanoparticles - …