Synthesis and characterization of Manganese doped ZnO nanoparticles
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-...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
2011
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| Online Access: | http://psasir.upm.edu.my/id/eprint/18784/1/Synthesis%20and%20characterization%20of%20Manganese%20doped%20ZnO%20nanoparticles.pdf |
| Summary: | 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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