Highly efficient field emission properties of vertically aligned 2D CuSe nanosheets: An experimental and theoretical investigation

We report the synthesis of klockmannite (CuSe) via a three-probe electrochemical set-up (chronoampereometry). The structural properties are examined by X-ray diffraction and Raman spectroscopy. Field emission scanning electron microscopy (FESEM) analysis revealed formation vertically aligned CuSe nanosheets with an average thickness 34 nm lateral size 700 nm. exhibit impressive field characteristics turn-on 1.4 V/µm for 10 µA/cm2 current density. Also, high density 5.8 mA/cm2 is observed at relatively low applied 3.1 V/µm. Complementary first-principles DFT calculations show that displays metallic conductivity, (001) surface has work function 5.12 eV, which believed to be responsible characteristics.