Abstract. One-dimensional TiO2/SiO2 core-shell nano bers were fabricated using a single-nozzle co-electrospinning process with phase-separated, mixed polymer composite solution. The core and shell were composed of Polyvinylpyrrolidone (PVP) and Polyacrylonitrile (PAN) polymers with uniform distribution of TiO 2 and SiO 2 nanoparticles (NPs), respectively. The NPs were synthesized via sol-gel reaction, simultaneously, in the respective polymer solutions. The morphologies and structures of the fabricated TiO2/SiO2 core-shell nano bers were investigated by XRD, FTIR, SEM, EDS, and TEM images. The in uences of di erent amounts of TiO2 and SiO2 precursors on the photocatalytic and UVshielding performance of TiO 2 /SiO 2 core-shell nano bers were studied. Photocatalytic activity of the nano bers was evaluated by observing photo-degradation of Methyl Orange (MO) aqueous solution under irradiation of ultraviolet (UV) light. Our results for the TiO 2 /SiO 2 core-shell nano bers indicate good potential for superior applications in photocatalytic and UV shielding devices.