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. 2020 May 5;8:291. doi: 10.3389/fchem.2020.00291

Figure 9.

Figure 9

Gas sensing response of nitrogen-doped carbon dot (NCD)–ZnO–pSi hybrid structure when measured with (A) 5 ppm, (B) 10 ppm, and (C) 15 ppm of CO2 concentration.