A flexible piezoelectric energy harvester-based single-layer ws2 nanometer 2d material for self-powered sensors

Quan Wang, Kyung Bum Kim, Sang Bum Woo, Yoo Seob Song, Tae Hyun Sung

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A piezoelectric sensor is a typical self-powered sensor. With the advantages of a high sensitivity, high frequency band, high signal-to-noise ratio, simple structure, light weight, and reliable operation, it has gradually been applied to the field of smart wearable devices. Here, we first report a flexible piezoelectric sensor (FPS) based on tungsten disulfide (WS2 ) monolayers that generate electricity when subjected to human movement. The generator maximum voltage was 2.26 V, and the produced energy was 55.45 µJ of the electrical charge on the capacitor (capacity: 220 µF) when applying periodic pressing by 13 kg. The generator demonstrated here can meet the requirements of human motion energy because it generates an average voltage of 7.74 V (a knee), 8.7 V (a sole), and 4.58 V (an elbow) when used on a running human (weight: 75 kg). Output voltages embody distinct patterns for different human parts, the movement-recognition capability of the cellphone application. This generator is quite promising for smart sensors in human–machine interaction detecting personal movement.

Original languageEnglish
Article number2097
Issue number8
StatePublished - 2021 Apr 2


  • Flexible device
  • Human movement
  • Monolayer
  • Piezoelectric energy harvester
  • Tungsten disulfide


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