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Reversible sensing of aqueous mercury using a rhodamine-appended polyterthiophene network on indium tin oxide substrates

机译:在铟锡氧化物基质上使用若丹明附加的聚对噻吩网络可逆地感测水银

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Herein we report the synthesis, and optical and electrochemical properties of a rhodamine-appended polyterthiophene network thin film which demonstrates ion selective potentiometric, chromic and fluorescent responses. The rhodamine-appended terthiophene monomer (RhoT) was electropolymerized and deposited on an ITO electrode. Ion selective potentiometric studies have shown that the potentials of the conducting polymer films decreased upon adding Hg2+ because interactions of Hg2+ with the rhodamine-appended conducting polymer film may increase charge carrier transport properties on a conjugated polymer through rhodamine-bound Hg2+, reduce the doping states by interfering with ions through ion-ion interactions, and perturb the pi-extended conjugated polymer through pi-pi interactions. Moreover, the lower detection limit of the ultrathin film sensor toward Hg2+ (0.10 mu M) was less than that obtained from RhoT (1.34 mu M), and the response time was less than 30 seconds. Reusability was evaluated by repeating dipping and rinsing cycles in aqueous Hg2+ and EDTA solutions. This approach may provide an easily measurable and inherently sensitive method for Hg2+ ion detection in environmental and biological applications.
机译:在本文中,我们报告了罗丹明附加的聚对噻吩网络薄膜的合成,光学和电化学性能,这些薄膜证明了离子选择性电位,色度和荧光响应。将附有若丹明的三联噻吩单体(RhoT)电聚合并沉积在ITO电极上。离子选择性电位研究表明,添加Hg2 +后,导电聚合物薄膜的电势降低,因为Hg2 +与若丹明附加的导电聚合物薄膜的相互作用可能会增加通过若丹明结合的Hg2 +在共轭聚合物上的电荷载流子传输性质,降低掺杂态通过离子-离子相互作用干扰离子,并通过pi-pi相互作用干扰pi扩展的共轭聚合物。另外,超薄膜传感器对Hg2 +的检测下限(0.10μM)小于从RhoT获得的检测下限(1.34μM),响应时间小于30秒。通过在Hg2 +和EDTA水溶液中重复浸渍和冲洗循环来评估可重复使用性。这种方法可以为环境和生物应用中的Hg2 +离子检测提供一种易于测量且固有敏感的方法。

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