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. 2020 Jun 23;13(12):2814. doi: 10.3390/ma13122814

Figure 1.

Figure 1

X-ray diffraction (XRD) spectra of WO3 layers prepared from PTA + EtOH and PTA + PrOH sol-gels using dipping times of 140 min and 180 min; samples wereannealed at 500 °C for 2 h.