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Visible light-driven self-powered aptasensors for ultrasensitive Microcystin-LR detection based on the carrier density effect of N-doped graphene hydrogel/hematite Schottky junctions
Analyst ( IF 4.2 ) Pub Date : 2021-08-30 , DOI: 10.1039/d1an01462e
Linhua Zhang 1 , Ding Jiang 1, 2 , Xueling Shan 1, 2 , Xiaojiao Du 3 , Meng Wei 1 , Yude Zhang 1 , Zhidong Chen 1, 2
Affiliation  

In this work, a novel visible light-driven self-powered photoelectrochemical (PEC) platform was designed based on 3D N-doped graphene hydrogel/hematite nanocomposites (NGH/Fe2O3) via a facile one-pot hydrothermal route. The coupling NGH with Fe2O3 could generate a Schottky junction, which promoted the separation of charges. Moreover, Mott–Schottky measurements validated that the carrier concentration achieved by NGH/Fe2O3 was about 3.4 × 103 times in comparison to that of pure Fe2O3, which was beneficial for efficient charge transfer. Owing to the carrier density effect and Schottky junction, the photocurrent of the as-fabricated NGH/Fe2O3 nanocomposites was 6.9-fold higher than that of pure Fe2O3. On the basis of such excellent Schottky junctions, an ultrasensitive visible light-induced self-powered PEC aptasensor was developed using a Microcystin-LR (MC-LR) aptamer. The as-fabricated PEC aptasensor displayed good analytical performance toward MC-LR detection in terms of wide linear range (1 pM–5 nM), low detection limit (0.23 pM, S/N = 3), excellent selectivity and high stability. This new strategy can provide a way for regulating nanostructures for more sensitive PEC sensors by increasing the carrier density.

中文翻译:

基于N掺杂石墨烯水凝胶/赤铁矿肖特基结的载流子密度效应的可见光驱动自供电适体传感器用于超灵敏微囊藻毒素-LR检测

在这项工作中,基于 3D N 掺杂石墨烯水凝胶/赤铁矿纳米复合材料 (NGH/Fe 2 O 3 ),通过简便的单锅水热路线设计了一种新型可见光驱动自供电光电化学 (PEC) 平台。NGH与Fe 2 O 3的耦合可以产生肖特基结,促进电荷分离。此外,Mott-Schottky 测量证实,与纯 Fe 2 O 3相比,NGH/Fe 2 O 3实现的载流子浓度约为 3.4 × 10 3,这有利于有效的电荷转移。由于载流子密度效应和肖特基结,制备的 NGH/Fe 2 O 3纳米复合材料的光电流比纯 Fe 2 O 3的光电流高 6.9 倍. 在如此优异的肖特基结的基础上,使用微囊藻毒素-LR (MC-LR) 适体开发了一种超灵敏的可见光诱导自供电 PEC 适体传感器。制造的 PEC 适体传感器在宽线性范围 (1 pM–5 nM)、低检测限 (0.23 pM, S/N = 3)、出色的选择性和高稳定性方面对 MC-LR 检测显示出良好的分析性能。这种新策略可以通过增加载流子密度为更灵敏的 PEC 传感器提供一种调节纳米结构的方法。
更新日期:2021-09-15
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