Potential Of Polyaniline Research Articles

Multi-spectrum compatible electrochromic device combining microwave transmission with ultra-wide emissivity modulation

The potential of polyaniline (PANI)-based electrochromic devices (ECDs) to offer adaptive anti-surveillance stealth in the visible/infrared bands is considerable. However, the incompatibility between infrared and radar stealth renders it challenging to achieve compatibility between the two with PANI-based ECDs. In this work, an etched electrode with frequency-selective surface configurations is initially designed for selective transmission and reflection of microwaves. Subsequently, a stellate PANI is prepared on the electrode surface by introducing triphenylamine (TPA) modification into the long molecular chain of disordered PANI, and assembled into a multi-spectrum compatible ECD. The results demonstrate that the ECD can achieve efficient transmission between 10.2–13.9 GHz, with a transmission rate approaching 90 % at 11.92 GHz, and enables the visible characteristics to switch between jungle dark green and desert earthy yellow. Furthermore, thermal-infrared emissivity (ε) modulation is achieved in the atmospheric transmission windows of 3–5 μm and 8–14 μm, with maximum emissivity change (Δε) of 0.61 and 0.73, respectively. The ECD demonstrated the capacity to exceed the limitations of static camouflage associated with existing multi-spectrum stealth materials, and exhibited a high degree of adaptability in intelligent electromagnetic confrontation environments.

Manufacturing and application of a fully polymeric electrophoresis chip with integrated polyaniline electrodes

This work describes the development of a fully polymeric microchip with integrated polymeric electrodes suitable for performing microchip electrophoresis. The polymer electrodes were fabricated in a thin film of the conducting polymer, polyaniline (PANI), by flash lithography using a studio camera flash and a transparency mask. During flash welding, exposed regions welded into non-conducting regions forming a conducting polymer circuit in the non-exposed regions. Using a structured layer of dry film photoresist for sealing, a polydimethylsiloxane (PDMS) substrate containing channels and reservoirs was bound to the PANI film to form an integrated microfluidic device. The conducting regions of the PANI film were shown to be capable of carrying the high voltages of up to 2000 V required for chip electrophoresis, and were stable for up to 30 minutes under these conditions. The PANI electrodes were used for the electrophoretic separation of three sugars labelled with 8-amino-1,3,6-pyrenetrisulfonic acid (APTS) in the dry film resist-PDMS hybrid device. Highly efficient separations comparable to those achieved in similar microchips using platinum electrodes confirm the potential of polyaniline as a new material suitable for high voltage electrodes in Lab-on-a-chip devices.

Spectroscopy and electrochemistry of polyaniline in non-aqueous solution

The cyclic voltammetric behaviour, in situ visible absorption and e.s.r. spectro-electrochemistry, as well as the 13C n.m.r. spectrum of polyanilime in non-aqueous solution have been investigated. It is shown by the absorption spectra of polyaniline in dimethyl sulphoxide (DMSO) solution at various polarized potentials that a self-transmission of protons appears between the nitrogen atoms linked on the polyaniline backbone during electrochemical redox processes. An increase of e.s.r. signal intensity with the oxidation potential of polyaniline in DMSO solution was observed. A mechanism of polyaniline solvation was suggested.