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A highly flexible, physically stable, and selective hydrogel-based hydrogen peroxide sensor
Sensors and Actuators B: Chemical ( IF 8.0 ) Pub Date : 2022-08-10 , DOI: 10.1016/j.snb.2022.132483
Jacopo Emilio Giaretta , Haowei Duan , Syamak Farajikhah , Farshad Oveissi , Fariba Dehghani , Sina Naficy

Sensitive, rapid, and continuous detection of hydrogen peroxide (H2O2) is of great importance in many systems for quality control, healthcare products, medical diagnostics, food safety, and environmental protection. Yet, the continuous monitoring of H2O2 remains challenging due to the cost, lack of specificity, and bulkiness of current H2O2 sensor technologies. These challenges are exacerbated for applications where the sensor must be fully submerged in a liquid media. In this work, a highly flexible hydrogel-based electrochemical sensor is constructed for reliable and ultrasensitive detection of H2O2 in liquid environments. The hydrogel-based H2O2 sensors are based on poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) as the transducer, hydrophilic polyurethane (HPU) as the hydrogel matrix, and horseradish peroxide (HRP) as the H2O2 specific redox enzyme. The sensors have a dual-mode sensing mechanism, namely amperometric and chemiresistive sensing. Benefited from co-redoxing of PEDOT:PSS and HRP, the sensors exhibit high stability, fast response (<6 s), and high selectivity against common interferences, as well as a detection range from 100 µM to 101.6 mM in amperometric mode or 613 nM to 6.13 mM in chemiresistive mode. The hydrogel-based sensors are stable in liquid environments without leaching of PEDOT:PSS after a 2-month storage period in an aqueous media.



中文翻译:

一种高度灵活、物理稳定和选择性的基于水凝胶的过氧化氢传感器

过氧化氢 (H 2 O 2 ) 的灵敏、快速和连续检测在质量控制、保健产品、医疗诊断、食品安全和环境保护的许多系统中都非常重要。然而,由于当前 H 2 O 2传感器技术的成本、缺乏特异性和体积庞大,对 H 2 O 2的连续监测仍然具有挑战性。对于传感器必须完全浸没在液体介质中的应用,这些挑战更加严重。在这项工作中,构建了一种高度灵活的基于水凝胶的电化学传感器,用于可靠和超灵敏地检测 H 2 O 2在液体环境中。基于水凝胶的 H 2 O 2传感器基于聚 (3,4-乙烯二氧噻吩):聚苯乙烯磺酸盐 (PEDOT:PSS) 作为传感器,亲水性聚氨酯 (HPU) 作为水凝胶基质,辣根过氧化物 (HRP) 作为传感器H 2 O 2特定的氧化还原酶。传感器具有双模式传感机制,即电流传感和化学电阻传感。得益于 PEDOT:PSS 和 HRP 的共氧化还原,传感器表现出高稳定性、快速响应 (<6 s) 和对常见干扰的高选择性,以及在电流模式或 613 下从 100 µM 到 101.6 mM 的检测范围在化学电阻模式下 nM 至 6.13 mM。基于水凝胶的传感器在液体环境中稳定,在水性介质中储存 2 个月后不会浸出 PEDOT:PSS。

更新日期:2022-08-11
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