Zhang Wei-Jun, Bai Ling, Lu Li-Min, Chen Zhuo
College of Science, Jiangxi Agricultural University, Nanchang 330045, PR China.
Colloids Surf B Biointerfaces. 2012 Sep 1;97:145-9. doi: 10.1016/j.colsurfb.2012.04.021. Epub 2012 Apr 20.
In this paper, we have demonstrated a new carbon nanotubes (CNTs) composite sensor with Pd nanoparticles prepared by seed-mediated growth method, using 3.5 nm gold nanoparticles as seeds and CNTs as growth scaffold. Their morphological characterization was carried out by scanning electron microscopy (SEM) and transmission electron microscope (TEM). Cyclic voltammetry and chronoamperometry were employed to characterize the performance of the modified electrode (PdNPs/AuNPs/CNTs/chitosan (chit) electrode). The results showed that the modified electrode had obvious electrochemical activity for electrocatalytic reduction of hydrogen peroxide (H(2)O(2)) at -0.2V. Low detection limit of 0.1 μM with wide linear range from 0.1 μM to 6 mM could be obtained. The results of the experiment also showed that the sensor exhibits good reproducibility and long-term stability, as well as high selectivity with no interference from other oxidable species.
在本文中，我们展示了一种通过种子介导生长法制备的新型碳纳米管（CNTs）复合传感器，该传感器含有钯纳米颗粒，以3.5纳米的金纳米颗粒作为种子，以碳纳米管作为生长支架。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对其进行形态表征。采用循环伏安法和计时电流法对修饰电极（PdNPs/AuNPs/CNTs/壳聚糖（chit）电极）的性能进行表征。结果表明，修饰电极在-0.2V时对过氧化氢（H₂O₂）的电催化还原具有明显的电化学活性。可获得低至0.1μM的检测限，线性范围宽，从0.1μM到6mM。实验结果还表明，该传感器具有良好的重现性和长期稳定性，以及高选择性，不受其他可氧化物质的干扰。
