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Comparison between electrochemical and photoelectrochemical detection of dopamine based on titania-ceria-graphene quantum dots nanocomposite.
Biosensors and Bioelectronics ( IF 12.6 ) Pub Date : 2019-12-23 , DOI: 10.1016/j.bios.2019.111977
Nasrin Ahmadi 1 , Mojtaba Bagherzadeh 2 , Ali Nemati 3
Affiliation  

In this study, titania-ceria-graphene quantum dot (TC-GQD) nanocomposite was synthesized by hydrothermal method for the first time. The prepared nanomaterials were characterized by XRD, FTIR dynamic light scattering (DLS), FESEM, HRTEM, and EDX spectroscopy along with elemental mapping. The synergistic effect of the nanocomposite components was studied by diffuse reflectance spectroscopy (DRS) and electrical conductivity meter. The results showed that band gap of TC-GQD nanocomposite was shifted to visible lights relative to its components (1.3 eV), and electrical conductivity of the sample was significant increased to 89.5 μS cm-1. After chemical and physical characterization, prepared new nanocomposites were used to design a new electrochemical (EC) and photoelectrochemical (PEC) dopamine (DA) sensors. In both EC and PEC methods effecting experimental parameters were optimized. Due to the synergic effect of the nanocomposite components, an outstanding photocurrent response was observed for DA based on PEC sensor. A linear calibration curve with a lower detection limit of 22 nM DA, and sensitivity of 13.8 mA/mM(DA), in a wider range of 0.3-750 μM DA, was obtained for TC-GQD/GCE electrode in PEC. While, the TC-GQD/GCE electrode detected DA in the range of 1-500 μM DA, with two linear calibration curve, detection limit of 0.22 μM DA, and sensitivity of 4.9 mA/mM(DA), in the EC. Observed results from EC and PEC sensors are presented and compared.

中文翻译:

基于二氧化钛-二氧化铈-石墨烯量子点纳米复合材料的多巴胺的电化学和光电化学检测的比较。

本研究首次采用水热法合成了二氧化钛-氧化铈-石墨烯量子点(TC-GQD)纳米复合材料。通过XRD,FTIR动态光散射(DLS),FESEM,HRTEM和EDX光谱以及元素图谱对制备的纳米材料进行了表征。通过漫反射光谱法(DRS)和电导率仪研究了纳米复合材料组分的协同作用。结果表明,TC-GQD纳米复合材料的带隙相对于其组分(1.3 eV)转移到可见光,并且样品的电导率显着提高到89.5μScm-1。经过化学和物理表征后,准备的新纳米复合材料可用于设计新的电化学(EC)和光电化学(PEC)多巴胺(DA)传感器。在EC和PEC方法中,对影响实验参数的方法都进行了优化。由于纳米复合材料组分的协同作用,基于PEC传感器的DA观察到了出色的光电流响应。对于PEC中的TC-GQD / GCE电极,获得了线性校准曲线,其检测下限为22 nM DA,灵敏度为13.8 mA / mM(DA),在0.3-750μMDA的较宽范围内。而TC-GQD / GCE电极在EC中检测到的DA在1-500μMDA范围内,具有两条线性校准曲线,检测限为0.22μMDA,灵敏度为4.9 mA / mM(DA)。呈现并比较了EC和PEC传感器的观测结果。对于PEC中的TC-GQD / GCE电极,获得了线性校准曲线,其检测下限为22 nM DA,灵敏度为13.8 mA / mM(DA),在0.3-750μMDA的较宽范围内。而TC-GQD / GCE电极在EC中检测到的DA在1-500μMDA范围内,具有两条线性校准曲线,检测限为0.22μMDA,灵敏度为4.9 mA / mM(DA)。呈现并比较了EC和PEC传感器的观测结果。对于PEC中的TC-GQD / GCE电极,获得了线性校准曲线,其检测下限为22 nM DA,灵敏度为13.8 mA / mM(DA),在0.3-750μMDA的较宽范围内。而TC-GQD / GCE电极在EC中检测到的DA在1-500μMDA范围内,具有两条线性校准曲线,检测限为0.22μMDA,灵敏度为4.9 mA / mM(DA)。呈现并比较了EC和PEC传感器的观测结果。
更新日期:2019-12-23
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