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Synthesis and Characterization of NiO Nanoparticles by Chemical Co-precipitation Method: an Easy and Cost-Effective Approach

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Abstract

In the present work, NiO nanoparticles are synthesized using chemical co-precipitation method which is an easy and cost-effective approach. Aqueous solutions of the precursors containing Ni(NO3)2.6H2O and NaOH pellets are calcined at 300 °C for 2 h. The structural, morphological, compositional, optical study, and thermal analysis of the synthesized powdered product was investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), UV–vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR) and thermo-gravimetric analysis. FTIR study shows the presence of functional groups in the synthesized NiO nanoparticles. The powder XRD pattern along with Rietveld refinement data reveals that the prepared sample is NiO with face-centered cubic (fcc) structure (Fm-3 m space group) having average crystallite size ranging from 4 to 6 nm. The optical band gap of the synthesized NiO nanoparticles (estimated from Tauc’s plot) is found to be ~ 3.20 eV which is less than the bulk NiO clearly showing red shift. This could be attributed due to the presence of chemical defects or vacancies resulting in the formation of some trap states.

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Acknowledgements

Authors are grateful to Prof. Rajendra K. Singh, Department of Physics, BHU for getting FTIR, UV-vis, and TG-DTA measurements done on our samples. The authors are much thankful to Dr. O.P. Sinha (Director, Amity Institute of Nanotechnology, Noida) for extending us the XRD facility. Thanks are also due to Dr. Manish K. Srivastava (Department of Physics, Banasthali Vidyapith, Rajasthan) for doing FE-SEM measurements of our samples. Mr. Anadi Krishna Atul also wants to acknowledge the University for providing the financial assistance in the form of UGC-Research fellowship.

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  1. Department of Physics, School of Physical Sciences, Mahatma Gandhi Central University, Motihari, 845401, Bihar, India

    Anadi Krishna Atul, Sunil Kumar Srivastava, Ajai Kumar Gupta & Neelabh Srivastava

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  1. Anadi Krishna Atul
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  2. Sunil Kumar Srivastava
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  3. Ajai Kumar Gupta
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  4. Neelabh Srivastava
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Correspondence to Neelabh Srivastava.

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Atul, A.K., Srivastava, S.K., Gupta, A.K. et al. Synthesis and Characterization of NiO Nanoparticles by Chemical Co-precipitation Method: an Easy and Cost-Effective Approach. Braz J Phys 52, 2 (2022). https://doi.org/10.1007/s13538-021-01006-2

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