Design pollution gas sensor using graphene ribbon: density function theory (DFT)

Density Function Theory (DFT) calculation was used to find out ground and excitation states for graphene ribbons, types of adsorption, energy gap, maximum wave length optical band gap. Adsorption showed that CO2 gas molecule had chemical adsorption in distance 1 1.5 Angstrom. appeared have physical 2 2.5 decreased when the between surface increased. Resulting from there a change Angstrom due attraction towards surface. Excitation Nano system samples 4 shifted low wavelength (blue shift), changing 1018 993 nm 718 on series. Other sample red shift gap became open. The result ribbon sensed carbon dioxide (CO2).