Recent research on u-Health, which can check and manage one''s health condition anytime, anywhere, is being actively conducted, as interest in personal health management has rapidly expanded due to the advent of IT. Research into monitoring biosignals by merely wearing or attaching them to the body is becoming increasingly popular. As a result, future electronics will take the shape of wearable devices, particularly accessories like basic watches that may be connected to the skin in a flexible form. To do so, a gadget that can swiftly identify and evaluate a large amount of data is required.
One of the most significant physiological characteristics of life is human breath, which gives valuable information regarding cardiac and pulmonary problems. Breath monitoring is useful for determining the health of the human body by recording physical parameters of the breath such as breath frequency and tidal volume. Electronic and pressure-detecting breath sensors are the most common commercially available breath sensors.
Because of their mechanical, chemical, and electrical properties, two-dimensional (2D) nanomaterials like Transition Metal Dichalcogenides (TMDs) attract attention. Because of its piezoelectric capabilities, electrical qualities, outstanding on/off ratio, high mechanical strength, flexibility, and compatibility with flexible substrates, Molybdenum disulfide (MoS2) was chosen among the 2D layered materials. However, there are just a few studies on respiratory sensors.
Chemical vapor deposition technologies were used to successfully build ultrahigh sensitive respiration sensors based on MoS2. It is feasible to evaluate respiratory response by measuring humidity change throughout the breathing process. The effect of defect, strain, crystal structure, and quality on respiratory response has also been investigated. As a result, we discovered that MoS2 can be successfully employed as a real-time respiration sensor. The successful demonstration of an inexpensive MoS2-based humidity-based respiration sensor opens up new possibilities in flexible and wearable electronics.