Institute of Biomaterials, College of Sciences, South China Agricultural University, Guangzhou 510642, Guangdong Province, People's Republic of China.
Nanotechnology. 2013 Feb 15;24(6):065501. doi: 10.1088/0957-4484/24/6/065501. Epub 2013 Jan 16.
Multiwalled carbon nanotubes (MWCNT) were homogeneously covered with a bio-functional polydopamine (PDOP) by a simple dip-coating approach in mild basic solution. Then, uniformly dispersed and highly loaded platinum nanoparticles (PtNPs) were deposited on MWCNT@PDOP by a mild reductant, and were characterized by transmission electron microscopy and x-ray photoelectron spectroscopy. Afterwards, this nanocomposite was modified on the glass carbon electrode and applied to simultaneously determine dopamine (DA) and uric acid (UA) by differential pulse voltammetry (DPV). Results showed that a linear electro-oxidation response was found for DA and UA in the range of 0.25-20 μM and 0.3-13 μM with the detection limit (S/N = 3) of 0.08 μM and 0.12 μM, respectively. In addition, the detection sensitivities for DA and UA by DPV were 1.03 μA μM(-1) and 2.09 μA μM(-1), respectively, which were much higher than those from a cyclic voltammogram. Finally, the reproducibility and stability of the nanocomposite were also evaluated, demonstrating that such MWCNT@PDOP@PtNPs can be a promising candidate for advanced electrode material in electrochemical sensing and other electrocatalytic applications.
多壁碳纳米管（MWCNT）在温和的碱性溶液中通过简单的浸涂方法均匀地被生物功能化的聚多巴胺（PDOP）覆盖。然后，通过温和的还原剂在 MWCNT@PDOP 上沉积均匀分散和高负载量的铂纳米粒子（PtNPs），并通过透射电子显微镜和 X 射线光电子能谱进行表征。之后，将该纳米复合材料修饰在玻碳电极上，并通过差分脉冲伏安法（DPV）同时测定多巴胺（DA）和尿酸（UA）。结果表明，在 0.25-20 μM 和 0.3-13 μM 的范围内，DA 和 UA 均呈现出线性电氧化响应，检测限（S/N=3）分别为 0.08 μM 和 0.12 μM。此外，通过 DPV 测定 DA 和 UA 的检测灵敏度分别为 1.03 μA μM(-1)和 2.09 μA μM(-1)，均高于循环伏安法的检测灵敏度。最后，还评估了纳米复合材料的重现性和稳定性，表明 MWCNT@PDOP@PtNPs 可以作为电化学传感和其他电催化应用中先进电极材料的有前途的候选材料。
