Deformable organic semiconductor sensors based on metal free phthalocyanine for pressure and compressive displacement monitoring

Abstract

Deformable differential semiconductor sensors of pressure and compressive displacement having two inputs and one output were fabricated. For the fabrication of the sensors the rubbing in technology was used to form conductive-semiconductive-conductive layered structure on a rubber substrate. The rubber substrate was doped with carbon nanotubes (CNTs) and mixture of CNTs-H2Pc (50:50 wt.% CNTsmetal free phthalocyanine) to form conductive and semiconductive layers, respectively. The dimensions of the rubber substrates were 2.5 x 1.5 x 0.5 cm 3 . Thickness of the CNT and CNT-H2Pc composites layers were in the range of 29-33μm, while their length and the width were 5-6 mm and 2-3 mm, respectively. It was found that the output resistance and the impedance of the sensor either decreased or increased depending on the input. The sensor showed high sensitivity of resistance and impedance under the effects of pressure (up to 240 gf/cm 2 ) and displacement (up to 500 µm). For practical applications the fabricated sensors may be used for determining pressure and compressive displacement.

Shockproof Deformable Infrared Radiation Sensors Based on a Polymeric Rubber and Organic Semiconductor H2Pc-CNT Composite

“… Molecular structure of organic semiconductor metal-free phthalocyanine (H 2 Pc) reprinted from Ref. [ 25 ]. …”

“… Schematic illustration of the rubbing-in technology used to fabricate the organic H 2 Pc-CNT (metal-free phthalocyanine–carbon nanotubes)-composite-based sensor adapted from Ref. [ 25 ]. …”

Recent progress of flexible pressure sensors: from principle, structure to application characteristics

“…The pressure sensor is one of the most frequently utilized sensors in industrial applications. Traditional pressure sensors are based on rigid materials such as semiconductors [1] and piezoelectric crystals [2]. Traditional pressure sensors benefit from well-established design and fabrication technologies, enabling them to precisely gauge pressure across a broad spectrum.…”