Advancements in Trace and Low Humidity Sensors Technologies Using Nanomaterials: A Review

It is important to highlight that in certain specialized industries, humidity detection limit is increasingly stringent. The dynamic range of humidity measurement can be expanded from low relative humidity levels to measurements at the ppm, ppb, or even ppt level. The increasingly tight humidity detection limits, especially in some industries, make this growth all the more important. Two major obstacles prevent the development of high-performance low-humidity sensors based on nanostructured materials: first, the sensor’s small water-molecule-absorbing capacity, and second, the restrictions imposed by some harsh environments. As of right now, there are few comprehensive reviews of studies done on trace and low humidity sensors. With any luck, the findings of this research will shed light on how low/trace humidity sensors should be developed, which should speed up the production of high-performance materials and encourage the use of better methods for controlling low humidity. Initially, our attention has been directed toward evaluating the contemporary market outlook and the significance of trace/low humidity sensors, encapsulating the evolutionary trends observed in recent years. We have explored the advancements made and the critical issues requiring attention over the past decade. In conclusion, we have provided a summary and offered insights into the future direction of low and trace humidity sensors.