Fig. 1. Schematic of femtosecond laser-induced nanowelding

Fig. 2. Damages of single TiO₂ nanowire under femtosecond laser localized irradiation

Fig. 3. Morphology of Pt-TiO₂ bondings. (a) Diameter of TiO₂ nanowires is 200 nm; (b) diameter of TiO₂ nanowires is 500 nm

Fig. 4. Strength characterization of Pt-TiO₂ bonding. (a) Atomic force microscopic morphology of bonding; (b) curves of the extend/retract force at point 1; (c) curves of the extend/retract force at point 2

Fig. 5. Characterization of infiltration at Pt-TiO₂ bonding

Fig. 6. Electric field distribution of Pt-TiO₂ bonding under localized irradiation

Fig. 7. Current response of Pt-TiO₂ nanowire before and after one-side welding by femtosecond laser

Fig. 8. Schematic of the nanowire for the synaptic response study. (a) Synapse model; (b) single TiO₂ nanowire under pulse excitation

Fig. 9. Current response of Pt-TiO₂ nanowire under divided monopulse excitation

Fig. 10. Current response of a TiO₂ nanowire under excitation of a series of pulses. (a) After welding; (b) before welding

Fig. 11. Characteristics of long-term memory of synapse simulated by the Pt-TiO₂ bonding. (a) Learning and forgetting curve with the number of electric pulses N=100; (b) current decay curve with the number of electric pulses N=100; (c) normalized current attenuation curve under different pulse number stimulation; (d) current decay time constant under different pulse number stimulation