Lu Qiyi, Zhang Juanjuan, Liu Xiaofang, Wu Yuanya, Yuan Ruo, Chen Shihong
Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Southwest University, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
Analyst. 2014 Dec 21;139(24):6556-62. doi: 10.1039/c4an01595a.
In this work, an enhanced electrochemiluminescence (ECL) sensor based on gold nanoflower@graphitic carbon nitride polymer nanosheet-polyaniline hybrids (AuNF@g-C3N4-PANI) was prepared for the detection of dapamine (DA). First, the bulk g-C3N4 was prepared through polymerizing melamine under 600 °C. And then the g-C3N4 nanosheet was obtained by ultrasonication-assisted liquid exfoliation of bulk g-C3N4. Finally, polyaniline (PANI) and gold nanoflowers (AuNFs) were successively formed on the g-C3N4 nanosheet through an in situ synthesis method. The resulting AuNF@g-C3N4-PANI hybrids were modified onto the surface of glassy carbon electrode to achieve a sensor (AuNF@g-C3N4-PANI/GCE) for detecting dopamine. Under the optimal conditions, the ECL signal increased linearly with the concentration of dopamine. The linear range of 5.0 × 10(-9) to 1.6 × 10(-6) M was obtained, while the detection limit was 1.7 × 10(-9) M. The prepared sensor exhibited a low detection limit and high sensitivity for the determination of dopamine. The combination of g-C3N4 nanosheet, PANI and AuNF would provide a new opportunity for the ECL sensor.
在本工作中，制备了一种基于金纳米花@石墨相氮化碳聚合物纳米片-聚苯胺杂化物（AuNF@g-C3N4-PANI）的增强型电化学发光（ECL）传感器，用于检测多巴胺（DA）。首先，通过在600℃下聚合三聚氰胺制备块状g-C3N4。然后，通过超声辅助液体剥离块状g-C3N4获得g-C3N4纳米片。最后，通过原位合成法在g-C3N4纳米片上依次形成聚苯胺（PANI）和金纳米花（AuNFs）。将所得的AuNF@g-C3N4-PANI杂化物修饰在玻碳电极表面，以实现用于检测多巴胺的传感器（AuNF@g-C3N4-PANI/GCE）。在最佳条件下，ECL信号随多巴胺浓度呈线性增加。获得了5.0×10(-9)至1.6×10(-6) M的线性范围，而检测限为1.7×10(-9) M。所制备的传感器在测定多巴胺时表现出低检测限和高灵敏度。g-C3N4纳米片、PANI和AuNF的结合将为ECL传感器提供新的机遇。
