One step low temperature synthesis of poly vinyl alcohol stabilised α-Ni (OH)₂ nanoparticles - structural, morphological and optical studies
by Annie Aureen Albert; D.G. Harris Samuel; V. Parthasarathy; J. Selvi
World Review of Science, Technology and Sustainable Development (WRSTSD), Vol. 17, No. 2/3, 2021

Abstract: This research work reports a facile procedure for preparing α-nickel hydroxide nanoparticles. Synthesis of α-Ni(OH)₂ nanoparticles was performed at low temperature using poly vinyl alcohol (PVOH) as a stabilising agent. The structure of the nanoparticles was studied using X-ray diffractograms (JCPDS card 22-0444) and Fourier transform infrared (FTIR) analysis. The peaks corresponding to 459 cm⁻¹ and 409 cm⁻¹ in FTIR revealed the actual structure of α-Ni(OH)₂. The size of the α-Ni(OH)₂ nanoparticles was computed using Scherrer's formula. The estimated size was 4 nm. The HRTEM micrograph of nano-sized α-Ni(OH)₂ revealed the formation of nanobristles with diameter of 2 nm. The nanobristles formed a 2D layer due to intercalation of PVOH with nickel hydroxide. The UV absorption spectrum further confirmed the nano size of α-Ni(OH)₂. Optical band gap values (E_g) of Ni (OH)₂ were determined for various precursor concentrations. The minimum value of band gap for α-Ni(OH)₂ nano particles was found to be 2.12 eV for 3.5 g of metal ion precursor.

Online publication date: Fri, 30-Apr-2021

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