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. 2023 Dec 14;16(24):7649. doi: 10.3390/ma16247649

Figure 7.

Figure 7

Photoabsorption spectra of SnO2 nanoparticles after a washing treatment. The synthesis reactions were performed at (a) 70 °C and (b) 80 °C. The linear part of each Tauc plot is extrapolated to the x-axis using the red line.