Printed organic electronics has attracted considerable interest in recent years as it enables the fabrication of large-scale, low-cost electronic devices, and thus offers significant possibilities in terms of developing new applications in various fields. Easy processing is a prerequisite for the development of low-cost, flexible and printed plastics electronics. Among processing techniques, meniscus guided coating methods are considered simple, efficient, and low-cost methods to fabricate electronic devices in industry. One of the major challenges is the control of thin film morphology, molecular orientations and directional alignment of polymer films during coating processes. Herein, the recent progress of emerging field of meniscus guided 2 printing organic semiconductor materials is discussed. The first part of this report briefly summarizes recent advances in meniscus guided coating techniques. The second part discusses periodic deposits and patterned deposition at moving contact lines, where the mass-transport influences film morphology due to convection at the triple contact line. The last section summarizes our strategy to fabricate large-scale patterning of πconjugated polymers using meniscus guided method. I)

Fast and efficient identification of bacterial pathogens in water and biological fluids is an important issue in medicine, food safety and public health concerns that requires low-cost and improved sensing strategies. Impedimetric sensors are promising tools for monitoring bacteria detection, due to their reliability and ease-of-use. We herein report a study on a new bio-interface-based amphiphilic poly(3-hexylthiophene)-bpoly(3-triethylene-glycol-thiophene), P3HT-b-P3TEGT, for label-free impedimetric detection of Escherichia coli (E. coli). This bio-interface is fabricated by selfassembly of P3HT-b-P3TEGT into core-shell nanoparticles, which are further decorated with mannose, leading to an easy-to-use solution-processable nanoparticle material for biosensing. The hydrophilic block, P3TEGT promotes antifouling and prevents non-specific interactions while improving the ionic and electronic transport properties, thus enhancing the electrochemical-sensing capability in aqueous solution. Self-assembly and micelle formation of P3HT-b-P3TEGT were analyzed by 2D-NMR, FTIR, DLS, contact angle and microscopy characterizations. Detection of E. coli was characterized and evaluated by electrochemical impedance spectroscopy, optical and scanning electron microscopy techniques. The sensing layer based on mannose-functionalized P3HT-b-P3TEGT nanoparticles demonstrates targetingability toward E. coli pili protein with a detection range from 10 3 CFU/mL to 10 7 CFU/mL and selectivity studied with Gram(+)bacteria. Application to real samples was performed by detection of bacteria in tap water and Nile water. The approach developed here shows that water/alcohol-processable functionalized conjugated polymer nanoparticles are suitable for use as electrode materials for the fabrication of a low-cost label-free impedimetric biosensor for the detection of bacteria in water.