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基于SiO2@BiOBr/rGO的光电化学传感器超灵敏检测多巴胺
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Abstract:
本研究对多巴胺(DA)进行光电化学检测，通过制备二氧化硅悬浮液(SiO2)、还原氧化石墨烯(rGO)、溴氧化铋(BiOBr)三种材料进而制备SiO2@BiOBr/rGO复合材料并构筑光电化学传感器，SiO2@BiOBr/rGO在有光时检测多巴胺时有显著的光电流响应。石墨烯具有优异的导电性和显著的机械强度。二氧化硅(SiO2)是一种成本低、高生物相容性、热稳定性、透光性能好、带隙窄的材料。BiOBr作为一种典型的半导体光电材料，拥有独特的层状四方结构，花状BiOBr由层状结构组成，有利于进一步抑制空穴–电荷重组，可提高其光电性能。该光电传感器检测多巴胺时的浓度范围为2~300 μmol/L，检出限为0.67 μmol/L，表明传感器对多巴胺有较好的检测效果。该SiO2@BiOBr/rGO光电化学传感器具有稳定性好、灵敏度高等优点，对多巴胺的检测具有重要的意义，希望其在监测细胞内多巴胺浓度水平方面具有广阔的应用前景。
This study aimed to prepare SiO2@BiOBr/rGO composite materials by combining SiO2 suspension, reduced graphene oxide (rGO), and bismuth oxybromide (BiOBr) for the construction of relevant photoelectrochemical sensors to detect dopamine (DA). Under visible light irradiation, SiO2@BiOBr/ rGO exhibited a significant photocurrent response during dopamine detection. Graphene has excellent electrical conductivity and remarkable mechanical strength. SiO2 has low production cost, high biocompatibility, thermal stability, good transparency, and a narrow-forbidden bandgap. As a typical semiconductor photoelectric material, BiOBr has a unique layered tetragonal structure. Flower-like BiOBr is composed of layered structures, which is conducive to further suppressing hole-charge recombination and improving its photoelectric performance. The concentration range of dopamine detected by this photoelectric sensor was 2~300 μmol/L, with a detection limit of 0.67 μmol/L, indicating that the sensor had a good detection effect on dopamine. This SiO2@BiOBr/rGO photoelectrochemical sensor has the advantages of good stability, high sensitivity and so on, and is of great significance for the detection of dopamine. It is expected to have broad application prospects in monitoring intracellular dopamine concentration levels.
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