Facile synthetic route for synthesis of cobalt nanorods and dendritic structures using a bomb digestion vessel

A complete green chemical reaction between aurochloric acid and tea polyphenols resulted in the reduction of Au 3? ? Au 0 . The reaction was carried out in a Teflon-coated bomb digestion vessel at 200°C. It was observed that with increasing the reaction time from 1 to 5 h, the shape of the nanoparticles changed from sphericalto rod-like structures. The reaction was followed with the help of UV-vis spectrometer, which showed a single absorption peak at 548 nm for 1-h reaction product and two peaks for a 5-h reaction product at 533 and 745 nm corresponding to the transverse and longitudinal surface plasmon resonance bands. Microstructures obtained from transmission electron microscope revealed that the samples obtained after 1-h reaction are predominantly spherical in shape with an average size of 15 nm. Whereas samples obtained after 5 h of reaction exhibited rod-like structures with an average size of 45 nm.

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A green chemical approach for synthesis of shape anisotropic gold nanoparticles

Kamal

Vimala

Sahoo

et al. 2014

Int Nano Lett

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Solvent dependent morphology and ⁵⁹Co internal field NMR study of Co-aggregates synthesized by a wet chemical method

Choudhary

Manjunatha

Damle

et al. 2018

Phys. Chem. Chem. Phys.

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Different shapes of Co-aggregates were synthesized via reduction of a Co salt (CoCl2·6H2O) by chemical precipitation using glycerol, ethylene glycol and ethanol as solvents. The effect of solvent on the morphology, fcc or hcp phase-content and the magnetic properties of the synthesized samples were investigated. The Co-aggregates synthesized using glycerol have a dense spherical shape and high saturation magnetization (MS), whereas ethylene glycol leads to formation of flower-shaped spherical aggregates through loose packing of smaller plate-like particles which have a moderate MS value. When ethanol was used as a solvent, a dendritic (leaf like)-shape of the aggregates with the lowest MS value was obtained. The formation of the obtained morphology of the aggregates was explained based on the size of the solvent molecule, the viscosity of the solvent and the number of polar groups (-OH) present in the solvent molecules. The magnetic domain state and domain wall dynamics of all the Co-samples were investigated using 59Co Internal Field Nuclear Magnetic Resonance (IFNMR) spectroscopy at RT and at 77 K. Through the IFNMR spectroscopy, the presence of gain boundaries, single domain particles and multi-domain particles/aggregates with domain walls associated with fcc and hcp phases were identified and quantified. We observed that the use of ethanol facilitates formation of a higher amount of hcp phase in the sample than the use of glycerol or ethylene glycol.

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Facile synthetic route for synthesis of cobalt nanorods and dendritic structures using a bomb digestion vessel

Cited by 2 publications

References 15 publications

A green chemical approach for synthesis of shape anisotropic gold nanoparticles

A green chemical approach for synthesis of shape anisotropic gold nanoparticles

Solvent dependent morphology and ⁵⁹Co internal field NMR study of Co-aggregates synthesized by a wet chemical method

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Facile synthetic route for synthesis of cobalt nanorods and dendritic structures using a bomb digestion vessel

Cited by 2 publications

References 15 publications

A green chemical approach for synthesis of shape anisotropic gold nanoparticles

A green chemical approach for synthesis of shape anisotropic gold nanoparticles

Solvent dependent morphology and 59Co internal field NMR study of Co-aggregates synthesized by a wet chemical method

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Solvent dependent morphology and ⁵⁹Co internal field NMR study of Co-aggregates synthesized by a wet chemical method