Data for: Optimized Thermochromic Properties of VO2/CoFe2O4 Nanocomposite Films via Band Gap Engineering
Description
Figure 1. XRD pattern of the CoFe2O4 sample. The inset is the corresponding FESEM image. Figure 2. XRD patterns of CoFe2O4/VO2 nanocomposites with CoFe2O4 addition content of (1) 0, (2) 1, (3) 2, (4) 4, and (5) 6 mmol. Figure 3. (a) XRD patterns of (1) physical mixture of CoFe2O4 and VO2 nanoparticles and CoFe2O4/VO2 nanocomposites with CoFe2O4 additive content of (2) 0, (3) 1, (4) 2, (5) 4, and (6) 6 mmol. (b) The relationship between the additive amount and grain size of CoFe2O4. Figure 4. FESEM images of VO2 nanoparticles without (a) and with 2 mmol CoFe2O4 (b). Figure 5. Transmittance spectra of CoFe2O4/VO2 nanocomposite films before (25 °C, solid line) and after (100 °C, dashed line) phase transition with CoFe2O4 additive content of 1 mmol and film thickness of (1) 264 (curve 1), (2) 305 (curve 2), (3) 370 (curve 3) and (4) 440 nm (curve 4). Figure 6.Transmittance spectra of pure VO2 nanoparticles (1), physical mixture of VO2 and CoFe2O4 nanoparticles (2), CoFe2O4/VO2 nanocomposites with CoFe2O4 additive content of (3) 1, (4) 2, (5) 4 and (6) 6 mmol at 25 °C (solid line) and 100 °C (dashed line). Figure 7. V 2p and O1s XPS of VO2 and CoFe2O4 physical mixture (1), CoFe2O4/VO2 nanocomposites with CoFe2O4 additive content of (2) 1, (3) 2, (4) 4 and (5) 6 mmol. Figure 8. Temperature-dependent infrared transmittance spectra of VO2 nanoparticles (1), physical mixture of VO2 and CoFe2O4 nanoparticles (2), CoFe2O4/VO2 nanocomposites with CoFe2O4 additive content of (3) 1, (4) 2, (5) 4 and (6) 6 mmol at 25 and 100°C. Figure 9. Temperature-dependent infrared transmittance spectra of the CoFe2O4/VO2 nanocomposite film with CoFe2O4 additive content of 1 mmol and thickness of 305 nm. The arrow direction points gradual increase in the temperature from 30 to 100 oC. Figure 10. DSC curves of VO2(M) nanoparticles (a), CoFe2O4/VO2 nanocomposites with CoFe2O4 additive content of (b) 1, (c) 2, (d) 4, (e) 6 mmol, and (f) CoFe2O4 nanoparticles, physical mixture of VO2 and CoFe2O4 nanoparticles with the mass ratio of (1) 3.4:0.7, (2) 2:4.6, (3) 1.3:3 in warming cycle. Figure 11. (a) UV-Vis absorption spectra and (b) (ah)2-h plots of VO2 (1), CoFe2O4 (2) and CoFe2O4/VO2 nanocomposites with CoFe2O4 additive content of (3) 1, (4) 2, (5) 4 and (6) 6 mmol. Figure S1 (a) TEM image, and (b) room-temperature magnetic hysteresis curves of the CoFe2O4 sample. The inset in (a) is the corresponding HRTEM image. Figure S2 Enlarged XRD patterns of the diffraction peak between 30 o and 34o. Figure S3 XPS spectra: (a) overall scan, (b) Co 2p and (c) Fe 2p of CoFe2O4/VO2 nanocomposites with CoFe2O4 additive content of 2 mmol.