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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: Penta-Graphene as a Potential Gas Sensor for NOx Detection

Fig. 2

Charge density difference plots. The adsorption configurations and charge transfer for each case in a different order from Fig. 1 are plotted in ae. The yellow isosurface indicates an electron gain, while the blue one represents an electron loss. The unit of isosurface value is e Å−3. Apparently, electron transfer in covalent a PG/NO and b PG/NO2 structure are much more obvious than others

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