Polyvinylidene fluoride (PVDF) has
better compliance and mechanical
processing performance than traditional piezoelectric ceramic materials
and is easy to process and mold. However, this also sacrifices part
of the piezoelectric properties of PVDF. Therefore, polymer–piezoelectric
ceramic composites were developed to balance this problem. Herein,
self-polarized PVDF piezoelectric fibers with stable hydrophobicity
and improved piezoelectric characteristics were prepared by using
a quick and efficient electrostatic spinning process, specifically,
dimethoxymethylvinylsilane-modified BaTiO3 (M-BTO) as a
piezoelectric enhancer, which improved the dispersion of the filler
and the piezoelectricity of the composites. As a result, the output
voltage and current of the M-BTO/PVDF composite piezoelectric fiber
reached 17.2 V and 421.1 nA, respectively. Moreover, the hydrophobic
surface of the composite gives it excellent self-cleaning properties.
In view of the excellent electromechanical conversion ability of the
composites, the prepared piezoelectric nanogenerator can be used to
detect different physiological signals in the human body. A simple
wireless system is set up to enable the wireless transmission of piezoelectric
signals. This study highlights an interfacial modification approach
for the preparation of high-performance piezoelectric energy harvesters,
providing a practical and potentially useful basis for human–machine
interface applications.