High-Current Triboelectric Nanogenerator Based on Bionic SrCO ₃ /BaTiZrO ₃ /PDMS for Finger Bending Signal Detection

With the growing demand for detecting minute human signals in patients with tactile dysfunction driven by the Internet of Things (IoT) development, triboelectric nanogenerator (TENG) offers a solution for high-precision human signal monitoring. This study proposes an improved flexible TENG featuring a nanopapillary structure composed of barium zirconate titanate/strontium carbonate/polydimethylsiloxane (Sr-BZT/PDMS) for wireless monitoring of human finger bending signals. Inspired by the natural micronano architecture of lotus leaves, a biomimetic papillary structure was constructed on the surface of the negative triboelectric layer film, significantly increasing its contact area and surface roughness. Further incorporation of piezoelectric barium zirconate titanate nanoparticles and strontium carbonate enhanced the electrical output performance of the TENG through synergistic effects with a triboelectric effect. Consequently, when the Sr-BZT nanoparticle content in the biomimetic Sr-BZT/PDMS composite film reached 15 wt %, the composite film exhibited superhydrophobicity and high surface roughness (Rq = 200 nm). The corresponding TENG achieved electrical output performance of 52 V, 246 μA, and 1.7 W/m2. Compared with PDMS-based TENGs, the optimized device exhibited a 49-fold increase in short-circuit current. Furthermore, the TENG maintained stable output performance after continuous operation for one month. The TENG based on this design can collect minute mechanical signals generated when a human finger bends.