Abstract
TENGs (triboelectric nanogenerators)-based droplet energy harvesting is a new technology that inspired the scientific community for its low cost and flexible operation as portable sensors in many real-life applications for detecting water pollutants, microplastics, sediment, and acidity. Here, we have described a droplet-driven TENG (DD-TENG) that can detect the concentration of different heavy metal ions by generating proportional triboelectric signals. The device shows excellent sensitivity in lower concentration levels (0.01 g/L - 0.1 g/L) and higher concentration levels (0.1 g/L - 0.51 g/L) with a response time of 16 µs. The sensor shows a very stable output of up to 3500 s of operation and a detection efficiency of up to 91 %. The low-cost and environmentally friendly operation of the device can be an excellent way to detect heavy metal ions effectively. The real-time monitoring capability can pave a new technological evolution in heavy metal ion detection technology in the future.
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