Carboxylic Acid‐Functionalized Conjugated Polymer Promoting Diminished Electronic Drift and Amplified Proton Sensitivity of Remote Gates Compared to Nonpolar Surfaces in Aqueous Media,Advanced Electronic Materials

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Carboxylic Acid‐Functionalized Conjugated Polymer Promoting Diminished Electronic Drift and Amplified Proton Sensitivity of Remote Gates Compared to Nonpolar Surfaces in Aqueous Media
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2020-06-11 , DOI: 10.1002/aelm.201901073
Hyun‐June Jang ₁ , Justine Wagner ₁ , Yunjia Song ₁ , Taein Lee ₁ , Howard E. Katz ₁

Affiliation

A systematic analysis is used to understand electrical drift occurring in field‐effect transistor (FET) dissolved‐analyte sensors by investigating its dependence on electrode surface‐solution combinations in a remote‐gate (RG) FET configuration. Water at pH 7 and neat acetonitrile, having different dipoles and polarizabilities, are applied to the RG surface of indium tin oxide, SiO₂, hexamethyldisilazane‐modified SiO₂, polystyrene, poly(styrene‐co‐acrylic acid), poly(3‐hexylthiophene‐2,5‐diyl) (P3HT), and poly [3‐(3‐carboxypropyl)thiophene‐2,5‐diyl] (PT‐COOH). It is discovered that in some cases a slow reorientation of dipoles at the interface induced by gate electric fields causes severe drift and hysteresis because of induced interface potential changes. Conductive and charged P3HT and PT‐COOH increase electrochemical stability by promoting fast surface equilibrations. It is also demonstrated that pH sensitivity of P3HT (17 mV per pH) is an indication of proton doping. PT‐COOH shows further enhanced pH sensitivity (30 mV per pH). This combination of electrochemical stability and pH response in PT‐COOH are proposed as advantageous for polymer‐based biosensors.

中文翻译：

与水性介质中的非极性表面相比，羧酸官能化的共轭聚合物可促进电子门的漂移减小和远距离门的质子灵敏度提高

通过研究远场栅极（RG）FET配置中电极对表面溶液组合的依赖性，可以使用系统分析来了解场效应晶体管（FET）溶解分析物传感器中发生的电漂移。水在pH 7和整齐乙腈，具有不同的偶极子和极化率，被施加到氧化铟锡的RG表面的SiO ₂，六甲基二硅改性的SiO ₂，聚苯乙烯，聚（苯乙烯-共丙烯酸），聚（3-己基噻吩-2,5-二基）（P3HT）和聚[3-（3-羧丙基）噻吩-2,5-二基]（PT-COOH）。已经发现，在某些情况下，栅极电场引起的界面处偶极子的缓慢重新定向会由于引起的界面电势变化而导致严重的漂移和磁滞现象。导电和带电的P3HT和PT-COOH通过促进快速的表面平衡来提高电化学稳定性。还证明了P3HT的pH敏感性（每个pH 17 mV）是质子掺杂的指示。PT-COOH显示出进一步增强的pH敏感性（每个pH 30 mV）。PT-COOH中电化学稳定性和pH响应的这种结合被认为对于基于聚合物的生物传感器是有利的。

更新日期：2020-07-13

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