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The interaction of DNA nucleobases with monolayer GaSe has been studied within DFT framework using vdW functional. We found that nucleobases arephysisorbed on the GaSe monolayer. The order of binding energy per atom is C >T > G > A. The room temperature recovery time estimated to be maximum of 113.88micro sec. for T+GaSe indicting reusability of the GaSe based devices. Themodulation in the electronic structures of GaSe has been clearly capturedwithin the simulated STM measurements. We also demonstrate quantum capacitanceas a key parameter for sensing applications. Furthermore, in opticalproperties, electron energy loss (EEL) spectra show red shift in photon energyon nucleobase adsorption in UV region. In nutshell, GaSe monolayer exhibitanisotropic optical response in UV-region which can be highly beneficial fordeveloping polarized optical sensors. Our results demonstrate that GaSemonolayer can be utilized to fabricate reusable DNA sequencing devices forbiotechnology and medical science.

DNA Nucleobase Interaction Driven Electronic and Optical Fingerprints in Gallium Selenide Monolayer for DNA Sequencing Devices