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- W3189027274 abstract "Full text: We have synthesized the nickel nanoparticles by pulsed laser ablation. The nickel disc in sodium dodecyl sulfate (SDS) with surfactant concentration of 10 mM and 20 mM, was used with the focused output of fundamental harmonic from Nd:YAG laser operating at the first harmonic (Iambda= 1064 nm). The laser power was fixed at 35 mJ/pulse with 10 ns pulse width and 10Hz repetition rate and was used for the ablation for 60 minute. Nickel oxide nanoparticles were synthesized by chemical method for different concentration of surfactant Cetyltrimethylammonium bromide (ClAB). the surfactant was used to provide favourable site for the growth of the particulate assemblies, which influences the formation process, including nucleation, growth, coagulation and flocculation. the materials used for synthesis were nickel chloride hexahydrate, sodium hydroxide (NaOH) and Cetyltrimethylammonium bromide (ClAB). UV-Visible absorption, X-ray diffraction, and transmission Electron Microscopy techniques were used for the characterization of produced nanoparticles. The powder samples were characterized by XRD measurements using Cu-Kα radiation at 40 KV with wavelength 1.5405 A{sup 0}. The EXAFS studies of pure nickel foil and for the synthesized nanoparticles with concentration 10mM of SDS show similar structures. The position of the main peak is same. The only difference was observed in the reduction of the amplitude, which can be attributed to the coordination number. The nearest neighbor distance was similar as for pure nickel foil. The Debye-Waller factor was also similar on comparison. There was no trace of oxide and hydroxide in the EXAFS data which suggest that the synthesized nanoparticles contain only nickel metal. The extended X-ray absorption fine structure (EXAFS) studies of calculated FEFF of nickel oxide and the synthesized nanoparticles with different concentration of ClAB show similar structures. In comparison to standard NiO spectra the reduction of the amplitude and a slight shift in peak position is observed, which can be attributed to the disordered system. The Fourier transform spectra reveal that the peaks of the synthesized samples and the reference are in very similar position, and the nearest neighbor distance is also similar. Study shows ClAB plays an important role in the growth process of NiO nanoparticles. An increase in surfactant concentration resulting in the decrease of crystal size, which is attributed to the selected adsorption of ions and their respective counter ions on the crystal faces during the growth of nanoparticles. (author)" @default.
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- W3189027274 date "2013-07-01" @default.
- W3189027274 modified "2023-09-27" @default.
- W3189027274 title "EXAFS measurements of nickel/nickel oxide nanoparticles and its comparison with TEM and XRD results" @default.
- W3189027274 hasPublicationYear "2013" @default.
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