Influence of ambient humidity on the magnitude of the piezoelectric strain coefficient of nitrogen-doped carbon nanotubes for the creation of strain sensors

This paper establishes patterns of influence of ambient humidity on the piezoelectric strain coefficient and the magnitude of the current generated by nitrogen-doped carbon nanotubes (N-CNTs) during their deformation. It is shown  that at humidity up to 60%, stable current generation is observed during the deformation of N-CNTs; at higher humidity, the instability of measurements increases and the spread of the generated current grows significantly, which is  associated with a decrease in the N-CNTs piezoelectric strain coefficient.