  In this study, structural stability, electronic, optical and vibrational
properties of DNA nucleobase adsorbed Graphene Quantum Dot (GQD) has been
investigated using density functional theory. Based on state-of-art electronic
structure calculations, we predict order of GQD sensitivity for DNA nucleobase
as Thymine > Cytosine > Guanine > Adenine. An interaction of GQD with DNA
nucleobase leads to modulation in electronic energy gap. Our calculated UV/vis
and IR vibrational spectra show unique spectral band that can be used
fingerprints in next generation DNA sequencing diagnostics.
