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[en] Highlights: • Se nanowires of 80 nm diameter were irradiated with Li+3 ion beam. • XRD confirmed no change in the crystal structure after ion beam irradiation. • Fluence 1×1012 ions/cm2 is found to be optimal for the increase in conductivity. • Impedance analysis was done for pre- and post- irradiated nanowires. This study is structured on Li3+ ion irradiation effect on the different properties of selenium (Se) nanowires (NW's) (80 nm). Template technique was employed for the synthesis of Se nanowires. Exploration of the effect of 10 MeV Li3+ ions on Se NW's was done for structural and electrical analysis with the help of characterization tools. X-ray diffraction revealed the variation in peak intensity only, with no peak shifting. The grain size and texture coefficients of various planes were also found to vary. Current-Voltage characteristics (IVC) show an increment in the conductivity up to a fluence of 1×1012 ions/cm2 and a decrease at the next two fluences. The effects of irradiation are presented in this paper and possible reasons for the variation in properties are also discussed in this study.