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Effect of sodium hydroxide concentration in synthesizing zinc selenide/graphene oxide composite via microwave-assisted hydrothermal method


Citation

Lee, Han Kee and Talib, Zainal Abidin and Mamat @ Mat Nazir, Md Shuhazlly and Wang, Enze and Lim, Hong Ngee and Mahdi, Mohd Adzir and Ng, Eng Khoon and Mohd Yusoff, Norita and Al-Jumaili, Batool Eneaze and Liew, Josephine Ying Chyi (2019) Effect of sodium hydroxide concentration in synthesizing zinc selenide/graphene oxide composite via microwave-assisted hydrothermal method. Materials, 12 (14). art. no. 2295. pp. 1-10. ISSN 1996-1944

Abstract

The effect of NaOH solution on the formation of nanoparticles has been the subject of ongoing debate in selenium-based material research. In this project, the robust correlation between the mechanistic growth of zinc selenide/graphene oxide (ZnSe/GO) composite and the concentration of NaOH are elucidated. The ZnSe/GO composite was synthesized via microwave-assisted hydrothermal method and the concentrations of NaOH are controlled at 2 M, 3 M, 4 M, 5 M and 6 M. The XRD spectra show that the crystal phases of the samples exhibited a 100% purity of ZnSe when the concentration of sodium hydroxide (NaOH) was set at 4 M. The further increase of NaOH concentration leads to the formation of impurities. This result reflects the essential role of hydroxyl ions in modifying the purity state of ZnSe/GO composite. The optical band gap energy of ZnSe/GO composite also decreased from 2.68 eV to 2.64 eV when the concentration of NaOH increased from 2 M to 4 M. Therefore, it can be concluded that the optimum concentration of NaOH used in synthesizing ZnSe/GO composite is 4 M. This project provides an alternative green method in the formation of a high purity ZnSe/GO composite.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.3390/ma12142295
Publisher: MDPI
Keywords: Microwave-assisted hydrothermal method; NaOH concentration; ZnSe/GO composite; Optical band gap
Depositing User: Nabilah Mustapa
Date Deposited: 04 May 2020 16:17
Last Modified: 04 May 2020 16:17
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ma12142295
URI: http://psasir.upm.edu.my/id/eprint/38322
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