Fig. 1. Principle of electrohydrodynamic direct writing equipment and sintering process

Fig. 2. Characterization spectra of precursor fibers

Fig. 3. Relationship between precursor fiber diameter and process parameters

Fig. 4. Relationship between conductive fiber resistance and sintering time

Fig. 5. Scanning electron microscope image of conductive fiber resistance

Fig. 6. Scanning electron microscope image of 40 layers of precursor fiber stack

Fig. 7. Relationship between the relevant parameters of the fiber and the number of stacked layers

Fig. 8. Response performance of humidity sensor

Fig. 9. Sensor circuit diagram