Flexible and Transparent Quasi‐1D Barium Stannate Nanorods Embedded PVDF Piezoelectric Nanogenerator: Mechanical Energy Harvesting and Security Surveillance Applications

The necessity for both residential and commercial security in the modern world is emphasizing the search for an automatic security alarm sensor that can identify unwanted intrusion. Herein, a flexible, transparent, high‐performance piezoelectric nanogenerator (PNG) using BaSnO 3 quasi‐1D nanorods/PVDF nanocomposite is engineered. The high aspect ratio of quasi‐1D BaSnO 3 nanorods helps to achieve the percolation threshold with a smaller volume fraction and also makes the nanocomposite films more sensitive when mechanical deformation is employed. The nanocomposite film containing 3 wt.% BaSnO 3 shows the highest electroactive phase of 84%. The optimized PNG exhibits the highest open circuit voltage, short circuit current, and power density of 46.21 V, 5.04 µA, and 22.2 µW cm −2 respectively under a force of 10 N. A 4.7 µF capacitor is charged and eight commercial LEDs are illuminated by the device. Additionally, the device is tested as a different human motion sensor. More importantly, the security alarm sensitivity for the device is demonstrated while opening the door. The buzzer rings along with the LED glows due to the bending strain on the piezoelectric nanogenerator. Therefore, the proposed PNG has the potential to be used as a security sensor, human motion sensor, and mechanical energy harvester.