Influence of annealing temperature on the sensitivity of nickel oxide nanosheet films in humidity sensing applications

Norfarariyanti Parimon and M. H. Mamat and A. S. Ismail and I. B. Shameem Banu and M. K. Ahmad and A. B. Suriani and M. Rusop (2020) Influence of annealing temperature on the sensitivity of nickel oxide nanosheet films in humidity sensing applications. Indonesian Journal of Electrical Engineering and Computer Science, 18. pp. 284-292. ISSN 2502-4752 (P-ISSN) , 2502-4760 (E-ISSN)

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Abstract

Nickel oxide (NiO) nanosheet films were successfully grown onto NiO seed-coated glass substrates at different annealing temperatures for humidity sensing applications. NiO seed layers and NiO nanosheet films were prepared using a sol-gel spin coating and sonicated sol-gel immersion techniques, respectively. The properties of NiO nanosheet films at as-deposited, 300 ℃, and 500 ℃-annealed were examined by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-vis) spectroscopy, and humidity sensor measurement system. The XRD patterns demonstrate that the grown NiO films have crystalline cubic structures at temperature of 300 ℃ and 500 ℃. The FESEM images show that the large porous nanosheet network spread over the layers as the annealing temperature increased. The UV-vis spectra revealed that all the nanosheet films have the average transmittance below than 50% in the visible region, with absorption edges ~ 350 nm. The optical band gap energy was evaluated in ranges of 3.39 to 3.61 eV. From the obtained humidity sensing results, it shows that 500 ℃-annealed film exhibited the best sensitivity of 257, as well as the slowest response time, and the fastest recovery time compared with others.

Item Type:	Article
Keyword:	Nickel oxide , Annealing temperature , Sol-gel immersion , Humidity sensing , Sensitivity
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1-9971 Electrical engineering. Electronics. Nuclear engineering > TK7800-8360 Electronics
Department:	FACULTY > Faculty of Engineering
Depositing User:	SAFRUDIN BIN DARUN -
Date Deposited:	22 Nov 2021 08:07
Last Modified:	22 Nov 2021 08:07
URI:	https://eprints.ums.edu.my/id/eprint/30990

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