High-Performance Low-Voltage Organic Field-Effect Transistors Prepared on Electro-Polished Aluminum Wires

We report the preparation of high-performance low-voltage pentacene-based organic field-effect transistors (OFETs) fabricated on a metallic fiber (Al wire) substrate. The surface roughness of the wire was significantly reduced after 10 min of electro-polishing. A 120 nm thick Al₂O₃ gate dielectric layer was deposited on the anodized wire, followed by octadecyltrichlorosilane (ODTS) treatment. The ODTS-modified Al₂O₃ gate dielectrics formed around the Al wire showed a high capacitance of 50.1 nF cm^–2 and hydrophobic surface characteristics. The resulting OFETs exhibited hysteresis-free operation with a high mobility of 0.345 cm² V^–1 s^–1 within a low operating voltage range of −5 V, and maintained their high performance at an applied tensile strain of bending radius ∼2.2

Polypyrrole/Agarose-Based Electronically Conductive and Reversibly Restorable Hydrogel

Conductive hydrogels are a class of composite materials that consist of hydrated and conducting polymers. Due to the mechanical similarity to biointerfaces such as human skin, conductive hydrogels have been primarily utilized as bioelectrodes, specifically neuroprosthetic electrodes, in an attempt to replace metallic electrodes by enhancing the mechanical properties and long-term stability of the electrodes within living organisms. Here, we report a conductive, smart hydrogel, which is thermoplastic and self-healing owing to its unique properties of reversible liquefaction and gelation in response to thermal stimuli. In addition, we demonstrated that our conductive hydrogel could be utilized to fabricate bendable, stretchable, and patternable electrodes directly on human skin. The excellent mechanical and thermal properties of our hydrogel make it potentially useful in a variety of biomedical applications such as electronic skin