Fig. 2. (a) The TGA curves showing the relative thermogravimetric weight-losses for the GO–CNT papers with different concentrations of oCNTs. (b) The derivative thermogravimetric (dTG) curves depicting the temperature zones of maximum weight-losses. The zones associated with the removal of the physisorbed water (PW) and chemisorbed water (CW) are marked by dashed lines. (c) The temperature-programmed desorption mass spectroscopy (TPD-MS) presenting the desorption profiles of H₂O for GO and GO–CNT10. The first and second peak indicate the removal of the PW and CW, respectively. Inset: the desorption profiles for CO₂ and CO. Their maxima coincide with the removal of the CW.