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Effects on optoelectronic performances of EDOT end-capped oligomers and electrochromic polymers by varying thienothiophene cores
摘要： Four 3,4-ethylenedoxythiophene (EDOT) end-capped oligomers employing single bond, EDOT, thieno[3,2-b]thiophene (TT) and dithieno[3,4-b;3′,4′-d]thiophene (DTT) units as bridge cores were synthesized and their polymers have been grown electrochemically. To reveal the relationship of structure-performance, the physicochemical properties, energy gaps, micromorphology, and photoelectrochemical behaviors of the oligomers or their polymers were systematically studied. These oligomers with planar rigid structures exhibit gradually narrowed molecular band gaps benefiting from their extended molecular conjugative degrees. These polymers present high electrochromic performances such as the higher optical contrast (59.61%) and coloring efficiency (288.37 cm2 C–1), excellent stability and colour persistence. As a result, increasing cofacial conjugation degrees via integration of TT or DTT into polymer backbone is an efficient method to encourage the intermolecular π-interaction, which brings broad and strong absorption and promote the carriers rapidly transport in polymer backbones to enhance the photoelectric performances. This study will provide promising electrochromic polymers for display applications.
关键词： thienothiophene,electrochromism,EDOT,conjugated polymers,electrosynthesis
更新于2025-09-23 15:22:29
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Electrochemical transformation of black phosphorous to phosphorene quantum dots: effect of nitrogen doping
摘要： We present a comparative analysis of the structural and optical properties of electrosynthesized PQDs, a new class of size-tunable luminescent materials and their nitrogen doped counter parts(NPQDs). Nitrogen doping onto phopshorene lattice could be realized in situ at room temperature using either nitrogen containing electrolyte and/or supporting electrolyte in the solution. An increased quantum ef?ciency as well as redox behavior has been observed for PQDs upon nitrogen doping and a critical analysis of the effect of nitrogen on the structural, optical and electrochemical properties of PQDs suggests several potential bene?ts of applications ranging from electrocatalysts and molecular electronics to different types of sensors and bioimaging.
关键词： Nitrogen Doping,Phosphorene Quantum Dots,Black Phosphorus,Electrosynthesis
更新于2025-09-16 10:30:52