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Structural, optical and humidity sensing studies of nickel oxide (NiO) nanoparticles: effect of calcination temperature

P. K. Ingalagondi, N. C. Horti, Y. T. Ravikiran, M. Prashantkumar, and B. G. Kumaraswamy

Department of Physics, Government First Grade College for Women, Davanagere, India

 

E-mail: ings744@gmail.com

Received: 19 September 2023  Accepted: 5 January 2024

Abstract:

Herein, nickel oxide (NiO) nanoparticles have been synthesized through a simple co-precipitation route. The obtained samples were calcinated at two different temperatures (500 °C and 900 °C) using a muffle furnace. The structural, morphological, and optical properties of nanoparticles were examined by X-ray diffraction, Scanning electron microscopy, Energy dispersive X-ray, Fourier infrared spectroscopy and UV–Vis absorption spectroscopy. The resistive type humidity sensing behavior was studied through a locally fabricated experimental setup. The XRD pattern of the samples revealed that the as-prepared sample appeared in the β-Ni(OH)2 hexagonal phase, and the samples calcinated at 500 °C and 900 °C, are crystallized in the cubic structure of NiO phase. The formation of highly agglomerated and irregular shaped particles was noticed form SEM images. FTIR analysis confirmed the formation of β-Ni(OH)2 and pure NiO phases, which is supported by EDX analysis. UV–Vis absorption studies showed a red shift of absorption edge and a varying band gap of NiO nanoparticles with calcination temperature due to the crystal growth and increase in crystallinity of samples. The sample calcinated at 900 °C has shown a humidity sensitivity of 0.3 K-cm/% RH, a limit of detection of 7% RH and good linearity with a correlation co-efficient of 0.995.

Graphical abstract

Keywords: Nickel oxide; Co-precipitation method; Calcination temperature; Optical properties; Humidity sensing

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-024-03314-8

 

Chemical Papers 78 (5) 3331–3342 (2024)

Tuesday, May 21, 2024

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