Light-Activated Interface Charge-Alternating Interaction on an Extended Gate Photoelectrode: A New Sensing Strategy for EGFET-Based Photoelectrochemical Sensors,ACS Applied Materials & Interfaces

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Light-Activated Interface Charge-Alternating Interaction on an Extended Gate Photoelectrode: A New Sensing Strategy for EGFET-Based Photoelectrochemical Sensors
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-02-24 , DOI: 10.1021/acsami.2c22970
Hewei Si ₁ , Gu Huang ₁ , Jianjun Liao ₂ , Adrian C Fisher ₃ , Shiwei Lin ₁

Affiliation

Integration of extended gate field-effect transistors (EGFET) and photoelectrochemical (PEC) measurement to construct highly sensitive sensors is an innovative research field that was proven feasible by our previous work. However, it remains a challenge on how to adjust the interaction between the extended gate and the analyte and study its influence on EGFET-based PEC sensors. Herein, a new sensing strategy was proposed by a mutual electrostatic interaction. Three-dimensional TiO₂ and g-C₃N₄ core-shell heterojunction on flexible carbon cloth (TCN) was designed as the extended sensing gate. Tetracycline (TC) was also used as a model analyte, and it contains electron-donating groups (-NH₂ and -OH) with negative charge. The designed TCN-extended sensing gate was negatively charged in the dark by introducing carbon vacancies with oxygen doping in the g-C₃N₄ shell, while it was positively charged under illustration due to the aggregation of photogenerated holes on the surface. Therefore, a light-activated PEC sensing platform for the sensitive and selective determination of tetracycline (TC) was demonstrated. Such a PEC sensor exhibited wide linear ranges within 100 pM to 1 μM and 1–100 μM with a low detection limit of 0.42 pM. Furthermore, the sensing platform possessed excellent selectivity, good reproducibility, and stability. The proposed sensing strategy in this work can expand the paradigm for developing a light-regulated FET-based PEC sensor by mutual electrostatic interaction, and we believe that this work will offer a new perspective for the design of interface interaction in PEC devices.

中文翻译：

扩展栅极光电极上的光激活界面电荷交替相互作用：基于 EGFET 的光电化学传感器的新传感策略

集成扩展栅极场效应晶体管 (EGFET) 和光电化学 (PEC) 测量以构建高灵敏度传感器是一个创新的研究领域，我们之前的工作已证明该领域是可行的。然而，如何调整扩展门与分析物之间的相互作用并研究其对基于 EGFET 的 PEC 传感器的影响仍然是一个挑战。在此，通过相互静电相互作用提出了一种新的传感策略。柔性碳布（TCN）上的三维TiO ₂和gC ₃ N ₄核壳异质结被设计为扩展传感门。四环素 (TC) 也用作模型分析物，它包含给电子基团 (-NH ₂和-OH）带负电荷。_{通过在 gC 3} N ₄中引入碳空位和氧掺杂，设计的 TCN 扩展传感门在黑暗中带负电壳，而由于光生空穴在表面的聚集，它在插图下带正电。因此，展示了一种用于灵敏和选择性测定四环素 (TC) 的光激活 PEC 传感平台。这种 PEC 传感器表现出 100 pM 至 1 μM 和 1-100 μM 的宽线性范围，检测下限为 0.42 pM。此外，该传感平台具有优异的选择性、良好的重现性和稳定性。在这项工作中提出的传感策略可以扩展通过相互静电相互作用开发基于光调节 FET 的 PEC 传感器的范例，我们相信这项工作将为 PEC 设备中的界面交互设计提供一个新的视角。

更新日期：2023-02-24

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