Humidity sensor based on electrospun MEH-PPV:PVP microstructured composite

Abstract

Schematic diagram of the fabrication process of the electro-spun humidity sensor.

Compositional engineering of the pi-conjugated small molecular VOPcPhO : Alq3 complex to boost humidity sensing

“…Relative permittivity of organic-based materials with small molecular sizes lies between 4-8; 25 on the other hand, water permittivity is $80. 4 The dielectric constant of water remarkably increases capacitance of a sensor because of a large difference between the relative permittivity of water and active thin lm of respective materials and their composites. Fig.…”

“…Organic materials are very sensitive towards moisture and are good applicants to fabricate sensors for humidity measurements. [1][2][3][4] In order to employ a humidity sensor in a wide range of applications, it must possess superior sensitivity, slight hysteresis, short response time, adequate durability, and a low manufacturing cost. 5,6 However, in the current scenario, researchers are struggling to introduce correct material combinations which possess outstanding properties of superior sensitivity and stability, while preserving a low manufacturing cost, a moderately simple processing method, and eco-friendly techniques.…”

“…5,6 However, in the current scenario, researchers are struggling to introduce correct material combinations which possess outstanding properties of superior sensitivity and stability, while preserving a low manufacturing cost, a moderately simple processing method, and eco-friendly techniques. 4,[7][8][9] Even though researchers have managed to introduce various simple fabricating processes, which can be coupled with physical and chemical exibility from polymer organic-based materials, mass production of these types of sensing devices seems promising only once their other limitations have been overcome.…”

Biochars as Innovative Humidity Sensing Materials

“…Using SWP700, the biochar most sensitive towards humidity, sensors with different amounts of PVP were produced. PVP is a n-type hydrophilic conductive polymer [27,28] used here in 10 and 20 wt %. In addition, a pure PVP sensor was also realized.…”

Morphology‐Driven Sensitivity Enhancement of MEH‐PPV Langmuir‐Blodgett Films on Plastic Substrates for NO2 Gas

“…Though a face‐on orientation is preferred for devices that require charge transport normal to the substrate (e. g. photovoltaic cells, light‐emitting diodes), edge‐on orientation is desirable for devices with in‐plane charge transport (e. g., transistors, sensors, Figure b). Recently, electrospun MEH‐PPVs have been reported as humidity sensor based on capacitive changes, however the sensitivity was low. Enhancement of sensitivity was obtained using composite of a co‐polymer and super hydrophilic poly(acrylic acid) partial sodium salt as sensing layer .…”