We develop a principle of CO, CO2 and H2O adsorption
enhancement theoretically using DFT by comparison of the
molecules adsorption behaviors on the pristine and Al-doped
graphene. It is established that the weak physisorption of these gas
molecules on pristine graphene could be significantly enhanced to
region of chemisorption by doping Al into structure of graphene.
The doped Al induces altering in the electronic structure of
graphene and then causes a strong adsorption of these spices. The
weak adsorption of these gas molecules by PG and in contrast the
strong adsorption by AlG were effectively confirmed by different
analysis such as NBO and DOS. Our results reveal that pristine
graphene is not a good adsorbent for these gas molecules and so we
introduce the Al-doped graphene as a superior adsorbent/sensor
for this purpose.