High and fast H2S response of NiO/ZnO nanowire nanogenerator as a self-powered gas sensor

- NiO/ZnO nanowire arrays as a self-powered/active gas sensor have been realized.
- This sensing system can work without any external electric power source.
- Compared with bare ZnO, high and fast H2S response has been obtained.
- New coupling effect between the piezoelectric characteristic of ZnO and the conversion of NiO/ZnO heterojunctions can influence the piezoelectric screening effect.