Humidity response property of Ba0.8Sr0.2TiO3 ordered nanofiber arrays synthetized via electrospinning

Uniaxially aligned Ba0.8Sr0.2TiO3 (BST) nanofiber arrays were fabricated via electrospinning combined with annealing. A specially designed collector composed of two paralleled aluminum electrodes and an insulative substrate were used in the electrospinning process. The morphology and structure of the resultant arrays were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The SEM shows well uniaxial arrangement and the diameters before (300–500 nm) and after (100 nm) calcination. XRD shows well-defined perovskite crystal structure of the as-synthesized arrays. The humidity sensor based on the as-synthesized arrays exhibited a rapid response-recovery property at room temperature. The possible sensing mechanism was proposed.

► We synthesized the BST aligned nanofibers arrays via electrospinning and calcination. ► We fabricated a humidity sensor based on BST nanofibers arrays. ► The sensor exhibited excellent humidity response property at room temperature.