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2 2016

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Synthesis and characterization of NiO-ZnO nanocomposite by a cost efficient self-combustion technique

Vimal Kumar M., Gokul Raja T. S., Selvakumar N., Jeyasubramanaian K.

Journal of Achievements in Materials and Manufacturing Engineering

2016

Vol. 79, nr 1

13--18

Purpose: In this research work the nickel oxide incorporated zinc oxide nano composite with various level of percentage such as (0.2, 0.4 and 0.6) were synthesized using combustion processes. Fuel used for the combustion process is hexamine in this work. Oxidizing agents taken were the nitrates of zinc and nickel. These precursor nitrates were heated with hexamine fuel to undergo combustion process. Design/methodology/approach: After combustion the particles were collected and heat treated to maintain the purity of the samples. XRD results were in well accordance with the JCPDS data and the average crystalline sizes were in the range of 10~20 nm. UV-VIS absorbance results confirm the band gap in the visible region. With increase in concentration of NiO in the composite red shifted from 320 nm to 374 nm. FTIR supports the presence of Zn-O and Ni-O bonds by the characteristic vibrational peaks at 432 cm-1 and 470 cm-1 respectively. PL spectrum studies results in the redshift of ZnO peaks from 380 nm to 400 nm with addition of Ni2+ ions inside the lattice. SEM and AFM studies reveals the morphological and topographical visualizations of the nanocomposite powders. Findings: In this research work, the authors had successfully synthesized Nickel substituted Zinc oxide by following simple combustion method followed by annealing. XRD analysis clearly evidences the formation of ZnO in the hexagonal wurtzite structure with an average crystallite size of 15 nm to 18 nm. An increase in Nickel peaks in between the Zinc oxide peaks were observed with increase in the nickel concentration in the composition. Practical implications: We conclude that combustion technique is suitable to fabricate Nickel incorporated Zinc oxide particles with high purity. This powder can be used in transparent conducting thin flims for OLED applications.

Surface morphology and topographical studies of fluorine doped tin oxide as transparent conducting film

Jeyasubramanian K., Gokul Raja T. S.

Archives of Materials Science and Engineering

2016

Vol. 78, nr 2

66--70

Purpose: This paper deals about the preparation and characterization of transparent conducting metal oxide doped with fluorine for superhydrophobic applications. Design/methodology/approach: Fluorine doped tin oxide(FTO) have been deposited on glass substrate employing an inexpensive spray pyrolysis route. Uniform coating of thin film was controlled by the parameters like flow rate, exposure duration, temperature of pyrolysis process etc. Findings: Fluorine doped SnO2 was confirmed from FTIR studies. Transparent nature of the coating was evaluated through UV-vis. spectroscopy. Electrical resistivity of the deposited film measured using source meter showed a least resistance of 13 Ω. AFM & SEM analysis revealed the texture of nano SnO2 in the range of 100-300 nm. Unevenness is one of the prerequisite for achieving superhydrophobic nature, which has been explored through AFM results. Practical implications: An attempt has been done to fabricate fluorine doped tin oxide thin film using spray pyrolysis technique may be used for developing super hydrophobic coating application. Originality/value: This study aims to reduce the cost of forming superhydrophobic surfaces on comparison with the process like plasma etching and sensitizing with nanoparticles, etc.