Title: Effect of temperature and duration of annealing step on the morphology of ZnO nanoparticles

Authors: Nguyen Phuc Nguyen; Diep Ngoc Le; Anh Van Thi Le; Linh Thuy Thi Vo; Chien Mau Dang; Ngan Nguyen Le

Addresses: Institute for Nanotechnology (INT), Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology (INT), Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology (INT), Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology (INT), Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology (INT), Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology (INT), Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City (VNUHCM), Ho Chi Minh City, 700000, Vietnam

Abstract: Zinc oxide nanoparticles (ZnO NPs) represent a nanostructured material with considerable potential for a wide range of applications. In this paper, ZnO NPs were synthesised utilising a precipitation method involving zinc acetate dihydrate (Zn(CH₃COO)₂.2H₂O) and sodium hydroxide (NaOH). After the precipitation reaction, obtaining solid samples were calcined at high temperatures. Two crucial parameters, namely temperature and annealing time, were systematically investigated in this study. The characterisation of ZnO NPs was conducted through the utilisation of field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD). The obtained results indicated a significant alteration in both particle morphology and size with variations in temperature and annealing time. The smallest average size and crystallite size of ZnO nanoparticles observed were 45 nm and 25 nm with annealing temperature of 550^oC in 2 h respectively.

Keywords: zinc oxide nanoparticles; precipitation; annealing; temperature.

DOI: 10.1504/IJNT.2024.146460

International Journal of Nanotechnology, 2024 Vol.21 No.7/8/9/10/11/12, pp.622 - 636

Published online: 30 May 2025 *

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