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Table 2
Gaussian fitting for percentage of Ce3+of pure CeO2nanospheres before and after Ar annealing
Sample	Peak position (eV)		Peak area (eV)		Percentage of Ce³⁺(%)
Sample	Before Ar annealing	After Ar annealing	Before Ar annealing	After Ar annealing	Before Ar annealing	After Ar annealing
CeO₂ at 200 °C for 12 h	5737.881	5738.471	5.128	5.672	7.8	12.4
	5730.733	5731.222	3.791	3.603
	5724.617	5725.931	0.761	1.308
CeO₂ at 160 °C for 24 h	5737.245	5738.888	6.734	4.703	9.8	10.4
	5729.911	5731.695	3.549	3.427
	5726.128	5726.769	1.013	0.949
CeO₂ at 200 °C for 24 h	5738.440	5736.924	5.154	5.713	13.7	13.3
CeO₂ at 200 °C for 24 h	5731.205	5729.691	3.799	3.741
	5726.465	5724.987	1.427	1.445

Phokha et al. Nanoscale Research Letters 2012 7:425 doi:10.1186/1556-276X-7-425

Table 2