目的:本研究通过水热法合成碘氧化铋(BiOI),采用一步混合溶剂热法制备SiO2@BiOI,将其修饰在聚苯胺(PANI)上,制备SiO2@BiOI/PANI复合材料,从而对葡萄糖进行特异性光电化学检测。在可见光照射下,具有高比表面积且表面带有微小的空隙结构的...目的:本研究通过水热法合成碘氧化铋(BiOI),采用一步混合溶剂热法制备SiO2@BiOI,将其修饰在聚苯胺(PANI)上,制备SiO2@BiOI/PANI复合材料,从而对葡萄糖进行特异性光电化学检测。在可见光照射下,具有高比表面积且表面带有微小的空隙结构的SiO2微球可以有效地吸收光能并产生激发态,逐层堆叠的BiOI纳米花材料能够将光能产生光生电子–空穴对,两者进行复合有助于将产生的电子–空穴对有效分离和传输,提高光电流响应。PANI具有优异的导电性能,能够促进电子转移,有效抑制电子–空穴对的复合,从而实现对葡萄糖的超灵敏检测。该光电传感器检测葡萄糖时的浓度范围为5~200 μmol/L,检出限为1.67 μmol/L,表明SiO2@BiOI/PANI对葡萄糖具有较好的检测效果。该SiO2@BiOI/PANI光电化学传感器具有选择性良好、响应时间快、灵敏度高等优点,对葡萄糖的检测具有重要意义,期待其成为葡萄糖检测领域中一种具有潜力的新型传感器技术。Purpose: In this study, bismuth iodide (BiOI) was synthesised by a hydrothermal method, and SiO2@BiOI was prepared by a one-step hybrid solvothermal method, and then modified on polyaniline (PANI) to prepare SiO2@BiOI/PANI composites for the specific photoelectrochemical detection of glucose. Under visible light irradiation, SiO2 microspheres with high specific surface area and tiny void structure on the surface can effectively absorb light energy and generate excited states, and the layer-by-layer stacking of BiOI nanoflowers can generate photogenerated electron-hole pairs from light energy, and the composite of the two can help to efficiently separate and transport the generated electron-hole pairs to improve the response to photocurrent. PANI has excellent electrical conductivity, which can promote electron transfer and effectively inhibit the complexation of electron-hole pairs, thus achieving ultra-sensitive detection of glucose. The photoelectric sensor detected glucose in the concentration range of 5~200 μmol/L with a detection limit of 1.67 μmol/L, indicating that SiO2@BiOI/PANI has a good detection effect on glucose. The SiO2@BiOI/PANI photoelectrochemical sensor has the advantages of good selectivity, fast response time, high sensitivity, etc., which is of great significance for the detection of glucose, and is expected to become a new sensor technology with potential in the field of glucose detection.展开更多
文摘目的:本研究通过水热法合成碘氧化铋(BiOI),采用一步混合溶剂热法制备SiO2@BiOI,将其修饰在聚苯胺(PANI)上,制备SiO2@BiOI/PANI复合材料,从而对葡萄糖进行特异性光电化学检测。在可见光照射下,具有高比表面积且表面带有微小的空隙结构的SiO2微球可以有效地吸收光能并产生激发态,逐层堆叠的BiOI纳米花材料能够将光能产生光生电子–空穴对,两者进行复合有助于将产生的电子–空穴对有效分离和传输,提高光电流响应。PANI具有优异的导电性能,能够促进电子转移,有效抑制电子–空穴对的复合,从而实现对葡萄糖的超灵敏检测。该光电传感器检测葡萄糖时的浓度范围为5~200 μmol/L,检出限为1.67 μmol/L,表明SiO2@BiOI/PANI对葡萄糖具有较好的检测效果。该SiO2@BiOI/PANI光电化学传感器具有选择性良好、响应时间快、灵敏度高等优点,对葡萄糖的检测具有重要意义,期待其成为葡萄糖检测领域中一种具有潜力的新型传感器技术。Purpose: In this study, bismuth iodide (BiOI) was synthesised by a hydrothermal method, and SiO2@BiOI was prepared by a one-step hybrid solvothermal method, and then modified on polyaniline (PANI) to prepare SiO2@BiOI/PANI composites for the specific photoelectrochemical detection of glucose. Under visible light irradiation, SiO2 microspheres with high specific surface area and tiny void structure on the surface can effectively absorb light energy and generate excited states, and the layer-by-layer stacking of BiOI nanoflowers can generate photogenerated electron-hole pairs from light energy, and the composite of the two can help to efficiently separate and transport the generated electron-hole pairs to improve the response to photocurrent. PANI has excellent electrical conductivity, which can promote electron transfer and effectively inhibit the complexation of electron-hole pairs, thus achieving ultra-sensitive detection of glucose. The photoelectric sensor detected glucose in the concentration range of 5~200 μmol/L with a detection limit of 1.67 μmol/L, indicating that SiO2@BiOI/PANI has a good detection effect on glucose. The SiO2@BiOI/PANI photoelectrochemical sensor has the advantages of good selectivity, fast response time, high sensitivity, etc., which is of great significance for the detection of glucose, and is expected to become a new sensor technology with potential in the field of glucose detection.
