Flexible relative humidity sensor based on reduced graphene oxide and interdigital electrode for smart home

Abstract

With the rapid development and application of smart homes, sensors known as 'neurons' have become more and more important in this field. In response to the demand for relative humidity parameter in home monitoring, a flexible relative humidity sensor based on reduced graphene oxide (RGO) and interdigital electrode for smart homes was designed and prepared in this paper. The base of the interdigital electrode structure was polyimide, and the RGO film was prepared by a spraying process. A test system for the relative humidity sensor with different saturated salt solutions was also built. The test results show that the sensor resistance and relative humidity have a linear relationship in the range of 24.6% RH-82.9% RH, and the linearity is as high as 0.987. The sensitivity of the sensor is 0.51 kΩ/% RH. The relative humidity sensor with the characteristics of flexibility and high sensitivity will have broad application prospects and value in the field of smart homes.

Graphene-Based Flexible and Eco-Friendly Wearable Electronics and Humidity Sensors

“…Relative air humidity and the rGOCY electrical resistance exhibit correlation coefficients greater than 0.98, confirming a strong linear relationship. This behavior was previously reported for GO 16 and rGO 47 , indicating that water absorption results in an increase in the electrical resistance in both materials. These results indicate that rGOCY is moisture sensitive.…”

Large-area, size-controlled and transferable graphene oxide-metal films for humidity sensor

“…The resistance of all GO-M sensors exhibited a logarithmic relationship with ambient relative humidity within the range of 11% RH to 98% RH. This implies that the relationship between resistance and relative humidity is exponential, indicating that our sensor is more sensitive compared to common linear humidity sensors [24][25][26]. Figure S7 illustrates the repeatability of the humidity sensors, demonstrating similar resistance values in ten repeated tests, which confirms the sensor's reliability.…”

“…GO has been employed as sensors to monitor pressure [3,22], temperature [23], humidity [24][25][26] and so on. Figure 5 shows the relationship between the resistance of the GO-Cu sensor and the applied pressure.…”

Applications of flexible polyimide: barrier material, sensor material, and functional material

“…The sensor functions as a detection device, able to detect external physical information or specific substances and convert them into electrical signals or other forms of signal output to fulfill the requirements for information detection, transmission, processing, storage, and display. In recent years, electronic skin (E-skin) [80] , wearable flexible hybrid electronic equipment [81] , electronic medical detection, and other flexible Figure 10. The preparation, flexible property, and sound absorption property of PIFSs [78] .…”