This work demonstrates the applicability of one-dimensional nitrogen-doped diamond nanorods (N-DNRs) for the simultaneous electrochemical (EC) detection of Pb²⁺ and Cd²⁺ ions in an electrolyte solution. Well separated voltammetric peaks are observed for Pb²⁺ and Cd²⁺ ions using N-DNRs as a working electrode in square wave anodic stripping voltammetry measurements. Moreover, the cyclic voltammetry response of N-DNR electrodes towards the Fe(CN)₆^/4-/Fe(CN)₆^/3- redox reaction is better as compared to undoped DNR electrodes. This enhancement of EC performance in N-DNR electrodes is accounted by the increased amount of sp² bonded nanographitic phases in N-DNR electrodes, enhancing the electrical conductivity at the grain boundary (GB) regions. These findings are supported by transmission electron microscopy and electron energy loss spectroscopy studies. Consequently, the GB defect induced N-DNRs exhibit better adsorption of metal ions, which makes such samples promising candidates for next generation EC sensing devices.

这项工作证明了一维氮掺杂金刚石纳米棒（N-DNR）在同时电化学（EC）检测电解质溶液中Pb ²⁺和Cd ²⁺离子时的适用性。在方波阳极溶出伏安法测量中，使用N-DNR作为工作电极，观察到了Pb ²⁺和Cd ²⁺离子的良好分离的伏安峰。此外，与未掺杂的DNR电极相比，N-DNR电极对Fe（CN）₆ ^{/ 4-} / Fe（CN）₆ ^{/ 3-}氧化还原反应的循环伏安响应更好。sp ²的增加可解释N-DNR电极中EC性能的增强N-DNR电极中键合的纳米石墨相，增强了晶界（GB）区域的电导率。这些发现得到了透射电子显微镜和电子能量损失光谱学研究的支持。因此，GB缺陷诱导的N-DNR表现出更好的金属离子吸附能力，这使此类样品有望成为下一代EC传感设备的候选材料。