A Facile and Flexible Humidity Sensor Based on Porous PDMS/AgNWs and GO for Environmental Humidity and Respiratory Detection

Abstract

Humidity sensors, benefit from their superior humidity-sensitive components, are able to respond to the environment moisture changes. Based on this feature, the humidity sensor plays an increasingly vital role in biological detection. To improve the performance of humidity sensors, a large number of optimizations have been made from several aspects, such as material synthesis and structural design. In this study, a novel humidity sensor is designed to increase its specific surface area to carry more humidity-sensitive and conductive materials. A porous polydimethylsiloxane (PDMS) substrate is prepared in an economical friendly approach by using the thermal decomposition of sodium bicarbonate (NaHCO 3 ). Meanwhile, high-quality nano silvers (AgNWs) are applied as the intermediate conductive layer connecting the substrate and detective layer. graphene oxide (GO) is used as the humidity sensitive material in the sensor. It is remarkable that this sensor can detect the humidity with a wide range of 8.6 RH% to 93 RH% in a quick response with high sensitivity. Since this humidity sensor showed powerful functions, such as monitoring respiration and detecting environmental humidity, it will have broad potentials for real-time clinical and domestic healthcare.

Developing Wound Moisture Sensors: Opportunities and Challenges for Laser-Induced Graphene-Based Materials

“…The more common approach relies upon the deposition of a second, moisture-sensitive layer via drop casting, spraying, etc. [33,35,36,45]. A pertinent example is the work by Lan and colleagues (2020), where lasered graphene electrodes coated with graphene oxide were employed to facilitate measurement of stomatal moisture dynamics on leaves [45].…”

Flexible humidity sensor based on PEDOT:PSS/Mxene nanocomposite

“…For instance, Yuan et al [17] fabricated PEDOT:PVMA humidity sensor using inkjet-printing on a paper substrate that exhibited the sensor response of 71%-98% to exposure in air with humidity changing in range of 11%-97% RH at room temperature. Ma et al [18] reported that flexible humidity sensor based on porous PDMS/AgNWs and GO can detect the humidity with a wide range of 8.6-93 RH% in a fast response with high sensitivity. Hashim et al [19] introduced polyvinyl alcohol (PVA)-polyethylene oxide (PEO)copper oxide (CuO) nanocomposites as sensitive materials to be resistive humidity sensors.…”

Enhance the detection of surface micro/nanostructures by SPPs generated from silver film covered hemi-microsphere

“…Surface micro/nanostructures detection is of great significance in broad research fields, such as biomedical [1,2], environmental monitoring [3], micro-nano optics [4], and so on. The common surface micro/ nanostructures detection methods contain laser interferometry [5], scanning probe techniques [6], scanning electron microscopy [7,8], scanning near-field microscopy [9], and Raman spectroscopy [10].…”