The adsorption of formaldehyde (H2CO) on modified graphene sheets, combining vacancy and dopants (B,
N, and S), was investigated by employing the density functional theory (DFT). It was found that the
vacancy-defected graphene was more sensitive to absorb H2CO molecule compared with the pristine
one. Furthermore, the H2CO molecule tended to be chemisorbed on vacancy-defected graphene with
dopants, which exhibited larger adsorption energy and net charge transfer than that of one without
dopants. The results of partial electronic density of states (PDOS) indicated that the defect-dopant
combination effect on the adsorption process was mainly owing to the contribution of the hybridization
between dopants and C atoms around the vacancy. We hope our results will be useful for the application
of graphene for chemical sensors to detect formaldehyde gas.
The adsorption of formaldehyde (H2CO) on modified graphene sheets, combining vacancy and dopants (B,N, and S), was investigated by employing the density functional theory (DFT). It was found that thevacancy-defected graphene was more sensitive to absorb H2CO molecule compared with the pristineone. Furthermore, the H2CO molecule tended to be chemisorbed on vacancy-defected graphene withdopants, which exhibited larger adsorption energy and net charge transfer than that of one withoutdopants. The results of partial electronic density of states (PDOS) indicated that the defect-dopantcombination effect on the adsorption process was mainly owing to the contribution of the hybridizationbetween dopants and C atoms around the vacancy. We hope our results will be useful for the applicationof graphene for chemical sensors to detect formaldehyde gas.
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