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Fig. 3.
UV–visible GAP 1-13 spectrum of ceria Sol No 2. Inset: Plot of (αhν)2 as a function of photon energy, hν.
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Table 1 compares the Eg values obtained in this study with Eg values reported by other authors, all of whom used different synthesis methods to obtain ceria nanoparticles and ceria films.
Table 1.
The direct band gap energy values of ceria nanoparticles and films prepared under different conditions.
Synthesis method Particle size (nm) Eg (eV) Literature
Hydrothermal hydrolysis 4.6
8.6 3.31
2.80 This work
RAD process 4.1
5.8 3.42
3.37 [27]
Microemulsion 2.6
4.1 3.44
3.48 [28]
Sonochemical Aggregation of electron acceptor nanoparticles
3.6
3.3 3.03
3.45
3.68 [29]
Hydrothermal hydrolysis 1.8 3.7 [30]
Microemulsion 3.7 3.31 [31]
Hydrothermal 9.9 3.28 [32]
Solvothermal 8.5 2.7 [33]
Microwave 7.2
5.1
4.9 3.48
5.16