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Synthesis and characterization of manganese doped ZnO nanoparticles.


Abdollahi, Yadollah and Abdullah, Abdul Halim and Zainal, Zulkarnain and Yusof, Nor Azah (2011) Synthesis and characterization of manganese doped ZnO nanoparticles. International Journal of Basic and Applied Sciences, 11 (4). pp. 62-69. ISSN 2077-1223


Various levels of manganese (Mn)-doped ZnO were synthesized by precipitation method. Characterization was carried out by XRD, TEM, SEM, EDX, BET and the band gap measured by UV-visible reflectance. In the XRD pattern of samples, there is no signature of impurity peaks, which could indicate Mn-related secondary phases. The EDX show the amount of Mn doped on ZnO is slightly lower than the theoretical value. The SEM of 1% Mn-doped ZnO illustrated that morphology is well ordered, has low aggregation, and homogeneous distribution of particle size. High aggregation is observed, however, in other percentages of Mn-doped ZnO. Results of TEM show that more than 50% of the particles for undoped and Mn-doped ZnO use between 15 and 35 nm, with 1% Mn doped ZnO having the highest percentage (77%). The BET shows that the surface area of synthesized catalyst increases when the weight ratio of manganese increases up to 1% Mn, but decreases thereafter. The band gap of 1% Mn-doped ZnO is 2.2 eV which is smaller than the undoped ZnO band gap. The results of characterization show 1% Mn-doped ZnO has the highest surface area, the lowest particles size and the lowest agglomerate. Moreover the calculated band gap of 1% Mn-doped ZnO is lower than others except 0.5%Mn. Additionally, photodegradation of cresols under visible light showed that 1% Mn-doped ZnO had maximum adsorption and rate of photodegradation. In conclusion 1% Mn doped ZnO is suitable as the best photocatalyst to degrade cresols under visible light irradiation.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: IJENS Publishers
Keywords: ZnO; Co-precipitation; Mangenese Doping; Optical properties; Nanoparticles.
Depositing User: Nur Farahin Ramli
Date Deposited: 23 Jul 2013 02:46
Last Modified: 21 Oct 2015 03:43
URI: http://psasir.upm.edu.my/id/eprint/25110
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