Organic/Inorganic-Based Flexible Membrane for a Room-Temperature Electronic Gas Sensor

Abstract

A room temperature (RT) H2S gas sensor based on organic–inorganic nanocomposites has been developed by incorporating zinc oxide (ZnO) nanoparticles (NPs) into a conductivity-controlled organic polymer matrix. A homogeneous solution containing poly (vinyl alcohol) (PVA) and ionic liquid (IL) and further doped with ZnO NPs was used for the fabrication of a flexible membrane (approx. 200 μm in thickness). The sensor was assessed for its performance against hazardous gases at RT (23 °C). The obtained sensor exhibited good sensitivity, with a detection limit of 15 ppm, and a fast time response (24 ± 3 s) toward H2S gas. The sensor also showed excellent repeatability, long-term stability and selectivity toward H2S gas among other test gases. Furthermore, the sensor depicted a high flexibility, low cost, easy fabrication and low power consumption, thus holding great promise for flexible electronic gas sensors.

Advancements in Passive Wireless Sensors, Materials, Devices, and Applications

“…Resonance means that the sensor can work without a power supply and wireless sensing means that the sensor's detection information can be obtained through wireless sensing. The passive wireless sensor sensing mechanism is divided into optical and electrical in two ways [17]. This paper mainly describes the wireless sensing implemented by electrical means.…”