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Possibility of Combining Carbon Dots and Liquid Exfoliated Graphene as a Carbon-Based Light Addressable Potentiometric Sensor
ACS Sensors ( IF 8.9 ) Pub Date : 2021-02-05 , DOI: 10.1021/acssensors.0c02515
Fang Li 1 , Jizhao Zhang 1 , Shihui Hu 1 , Yunfang Jia 1
Affiliation  

A light addressable potentiometric sensor (LAPS) is a versatile sensing platform for bioassay. However, the lack of carbon-based LAPS (C-LAPS) is a bottleneck for its sustainable development in a carbon electronic era. Herein, a study of C-LAPS based on the combinations of carbon dots (CDs) and liquid exfoliated graphene (LEG) is presented. Devices of C-LAPS are first fabricated by self-assembling the hydrothermally synthesized CDs and the cosolvent ultrasonic delaminated LEG on poly(diallyldimethylammonium chloride) (PDDA)-modified indium tin oxide (ITO) glasses. According to the stacking orders of CDs and LEG, C-LAPS are named as CDs/LEG@PDDA/ITO and LEG/CDs@PDDA/ITO. Then, their electronic and photoelectronic features are measured and compared with the pure CD- and pure LEG-decorated ITO electrodes. Furthermore, working mechanisms are proposed by means of the classical theories of energy band bending and built-in electric field at the heterojunction of CDs and LEG. The resemblances of CDs/LEG@PDDA/ITO-based C-LAPS with Si-based LAPS (Si-LAPS) are confirmed from the points of view of production and separation of the photogenerated carriers, the formation of photocurrent, and the distinction with LEG/CDs@PDDA/ITO. Finally, its feasibility for biological application is justified by using the immune reaction of 5-methylcytosine (5mC) and its antibody (anti-5mC) as a proof of concept. The improved linear responses are evidenced by the comparisons with Si-LAPS’ results. Conclusively, the proposed C-LAPS is believed to be a candidate for traditional semiconductor-based LAPS, with the merit of solution-processable. Meanwhile, the theoretical deductions about C-LAPS’ principle can also pave the way for developing similar carbon-based sensors.

中文翻译:

结合碳点和液体膨胀石墨烯作为基于碳的光寻址电位传感器的可能性

光寻址电位传感器(LAPS)是用于生物测定的多功能传感平台。但是,缺乏碳基LAPS(C-LAPS)是其在碳电子时代可持续发展的瓶颈。本文中,提出了基于碳点(CDs)和液体剥落石墨烯(LEG)组合的C-LAPS的研究。首先通过在聚二烯丙基二甲基氯化铵(PDDA)改性的铟锡氧化物(ITO)玻璃上自组装水热合成的CD和助溶剂超声分层的LEG来制造C-LAPS器件。根据CD和LEG的堆叠顺序,C-LAPS分别命名为CD / LEG @ PDDA / ITO和LEG / CDs @ PDDA / ITO。然后,测量它们的电子和光电特性,并与纯CD和纯LEG装饰的ITO电极进行比较。此外,通过CD和LEG异质结处的能带弯曲和内置电场的经典理论,提出了一种工作机制。从光生载流子的产生和分离,光电流的形成以及与硅的区别出发,证实了CDs / LEG @ PDDA / ITO基的C-LAPS与硅基的LAPS(Si-LAPS)的相似性。 LEG / CDs @ PDDA / ITO。最后,通过使用5-甲基胞嘧啶(5mC)和其抗体(抗-5mC)的免疫反应作为概念证明,证明了其在生物学上的可行性。与Si-LAPS结果的比较证明了线性响应的改善。结论是,具有解决方案优点的C-LAPS被认为是传统的基于半导体的LAPS的候选产品。同时,
更新日期:2021-03-26
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