Absorption and emission properties of Zr-doped nanoceria synthesised by co-precipitation-hydrothermal treatment route

Figures & data

Table

ZrCe-0	Hydrothermal treatment at 200 °C, time 3 h, no doping with Zr
ZrCe-0.25	Hydrothermal treatment at 200 °C, time 3 h, doping with 0.25 mol% Zr
ZrCe-0.5	Hydrothermal treatment at 200 °C, time 3 h, doping with 0.5 mol% Zr
ZrCe-1	Hydrothermal treatment at 200 °C, time 3 h, doping with 1 mol% Zr
ZrCe-2	Hydrothermal treatment at 200 °C, time 3 h, doping with 2 mol% Zr
ZrEuCe-1	Hydrothermal treatment at 200 °C, time 3 h, doping with 1 mol% each of Zr and Eu

Figure 1. XRD patterns of pure and Zr/Zr–Eu-doped ceria samples.

Table 1. Parameters calculated from XRD data.

Sample no.	Crystallite size (nm)	Lattice parameter (Å)	Lattice strain (%)
ZrCe-0	8.7	5.4316	1.787
ZrCe-0.25	8.2	5.4315	1.855
ZrCe-0.5	8.4	5.4301	1.796
ZrCe-1	8.5	5.4257	1.792
ZrCe-2	8.8	5.4213	1.738
ZrEuCe-1	9.0	5.4651	1.700

Figure 2. Formation of Zr-doped ceria by precipitation-hydrothermal treatment route.

Figure 3. FTIR spectra of pure and Zr/Zr–Eu-doped ceria samples.

Figure 4. Raman spectra of pure and Zr/Zr–Eu-doped ceria samples.

Figure 5. UV–vis absorption spectra of pure and Zr/Zr–Eu-doped ceria samples.

Figure 6. Direct band gaps of Zr/Zr–Eu-doped ceria samples (a) ZrCe-0, (b) ZrCe-0.25, (c) ZrCe-0.5, (d) ZrCe-1, (e) ZrCe-2 and (f) ZrEuCe-1.

Table 2. Direct and indirect band gaps for Zr/Zr–Eu-doped ceria samples.

Sample no.	Eg (eV) direct	Eg (eV) indirect
ZrCe-0	3.6	2.95
ZrCe-0.25	3.6	2.8
ZrCe-0.5	3.6	2.8
ZrCe-1	3.6	2.9
ZrCe-2	3.7	2.9
ZrEuCe-1	3.6	2.95

Figure 7. Indirect band gaps of pure and Zr/Zr–Eu-doped ceria samples (a) ZrCe-0, (b) ZrCe-0.25, (c) ZrCe-0.5, (d) ZrCe-1 samples, (e) ZrCe-2 and (f) ZrEuCe-1.

Figure 8. Emission spectra of pure and Zr/Zr–Eu-doped ceria samples excited at 270 nm.

Figure 9. Emission spectra of pure and Zr/Zr–Eu-doped ceria samples excited at 500 nm.

Figure 10. (a) TEM micrograph of ZrCe-2 sample and (b) the corresponding SAED pattern.

Figure 11. Schematic presentation of mode of incorporation of Zr in ceria lattice.