KCl-Modified Dy₂O₃ Nanospheres with Humidity Response for Human Respiration Monitoring

As the core of a humidity sensor, the performance of the humidity-sensitive material plays an important role in the humidity sensor application. Through the doping of KCl, a feasible way has been widely used to improve the humidity sensitivity of sensing materials. However, in the reported synthesis, due to the limitation of nanomaterial morphology, it is difficult to say that KCl is uniformly doped in the interior of the nanomaterial. Therefore, based on the Dy2O3 nanosphere material with a nanotubular unit and with the help of the capillary effect of nanotubular structures, the KCl-doped Dy2O3 nanomaterial with a uniform distribution is designed and synthesized. Through the humidity sensitivity test, it can be found that the humidity sensitivity of the as-prepared humidity sensor has been greatly improved compared with the Dy2O3 nanomaterial. It has the ability of low-humidity detection. Moreover, a large number of practical applications of the material have been implemented; some related experiments show that the KCl/Dy2O3 nanosphere has good response characteristics in respiratory monitoring, vital sign monitoring, and speech recognition monitoring in different states of the human body. Therefore, it is believed that the composite will have good application potential in intelligent applications such as low-humidity detection and respiration monitoring in the future.