The Influence of Carboxyl−Functionalized Carbon Dots on Ethanol Selectivity in Gas Sensing

For semiconductor tin dioxide (SnO2) materials, the oxygen adsorption theory often struggles to explain their selectivity towards specific gases. Therefore, it is worth considering altering surface functional groups of SnO2 modify its state and enhance Due rich on surfaces carbon dots, this study employed a hydrothermal method prepare three types dots with varying carboxyl group contents by adjusting time. These were then used as dopants combined create composite gas-sensitive devices. The gas-sensing test results indicate that introduction can ethanol. Furthermore, at any operating temperature within range 150–300 °C, higher content dot-doped SnO2, sensitivity By employing density (DFT), interaction energies between target gas calculated. calculations validated results, confirming presence enhances provide new insights into research selective mechanism materials.