Free-standing porous boron-doped diamond (fs-pBDD) was successfully fabricated and employed as a flow-through working electrode in flow injection analysis (FIA) experiments for the first time. fs-pBDD was fabricated by microwave plasma enhanced chemical vapour deposition growth of BDD on a SiO₂ nanofiber template spin coated onto a silicon substrate in a multistep process, before being released by wet chemical etching of the silicon substrate. By means of cyclic voltammetry, the effective surface area of the fs-pBDD electrode was estimated to be 30.1 mm². Fundamental performance parameters of the fs-pBDD electrode in an FIA system were determined utilising [Ru(NH₃)₆]^3+/2+ redox probe. A detection potential of −0.3 V and the flow rate of 1.0 mL min⁻¹ were selected as optimal and were further employed for recording concentration dependence, which was linear from 5 µmol L⁻¹ to 750 µmol L⁻¹. Limits of detection and quantification were assessed as 1.6 µmol L⁻¹ and 5.3 µmol L⁻¹, respectively. The obtained results thus proved functionality of the developed fs-pBDD as a perspective electrode material for use as an electrochemical detector for liquid-flow techniques.

自支撑多孔硼掺杂金刚石 (fs-pBDD) 首次成功制造并用作流动注入分析 (FIA) 实验中的流通工作电极。fs-pBDD 是通过微波等离子体增强化学气相沉积生长 BDD 在多步工艺中旋涂到硅衬底上的 SiO ₂纳米纤维模板上制造的，然后通过湿法化学蚀刻硅衬底释放。通过循环伏安法，fs-pBDD电极的有效表面积估计为30.1 mm ²。_{使用 [Ru(NH 3} ) ₆ ] ^3+/2+确定 FIA 系统中 fs-pBDD 电极的基本性能参数氧化还原探针。^{-0.3 V 的检测电位和 1.0 mL min -1}的流速被选为最佳，并进一步用于记录浓度依赖性，从 5 µmol L ^-1到 750 µmol L ^-1呈线性关系。检测限和定量限分别评估为 1.6 µmol L ^-1和 5.3 µmol L ^-1。因此，所获得的结果证明了所开发的 fs-pBDD 作为透视电极材料的功能，可用作液体流动技术的电化学检测器。