PDF(Pubmed)
Abstract：
Nano-needle boron-doped diamond (NNBDD) films increase their performance when used as electrodes in the determination of Pb2+. We develop a simple and economical route to produce NNBDD based on the investigation of the diamond growth mode and the ratio of diamond to non-diamond carbon without involving any templates. An enhancement in surface area is achievable for NNBDD film. The NNBDD electrodes are characterized through scanning electron microscopy, Raman spectroscopy, X-ray diffraction, cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse anodic stripping voltammetry (DPASV). Furthermore, we use a finite-element numerical method to research the prospects of tip-enhanced electric fields for sensitive detection at low Pb2+ concentrations. The NNBDD exhibits significant advantages and great electrical conductivity and is applied to detect trace Pb2+ through DPASV. Under pre-deposition accumulation conditions, a wide linear range from 1 to 80 µgL-1 is achieved. A superior detection limit of 0.32 µgL-1 is achieved for Pb2+, which indicates great potential for the sensitive detection of heavy metal ions.
摘要：
纳米针掺硼金刚石（NNBDD）薄膜在Pb2测定中用作电极时可提高其性能。基于对金刚石生长模式和金刚石与非金刚石碳之比的研究，我们开发了一种简单而经济的生产NNBDD的路线，而不涉及任何模板。对于NNBDD膜,可实现表面积的增加。通过扫描电子显微镜对NNBDD电极进行了表征，拉曼光谱,X射线衍射,循环伏安法,电化学阻抗谱，和差分脉冲阳极溶出伏安法(DPASV)。此外，我们使用有限元数值方法来研究尖端增强电场在低Pb2浓度下灵敏检测的前景。NNBDD具有明显的优势和良好的导电性，可用于通过DPASV检测痕量Pb2。在沉积前积累条件下，实现了1至80µgL-1的宽线性范围。Pb2+的检测限为0.32μgL-1，这表明了对重金属离子的灵敏检测的巨大潜力。
