制作钽衬底掺硼金刚石薄膜材料电极(Ta/BDD),并利用此薄膜材料电极为工作电极通过阴极溶出伏安法检测水中的苯胺。用热丝化学气相沉积(HFCVD)方法沉积Ta/BDD薄膜电极,扫描电镜和拉曼光谱表明电极具有良好的物理性质,循环扫描测试表明电极具有宽的电势窗口4.1V(-1.8~+2.3Vvs SCE)和低背景电流,此特性对于电化学检测有着明显的优势。发现苯胺在氧化处理的Ta/BDD电极上有可逆的氧化还原峰,检测过程中未发生电极钝化现象。Ta/BDD电极在酸性介质中苯胺检测效果较明显,苯胺在1~40μmol/L范围内浓度与溶出峰电流值有较好的线性关系。
Boron-doped diamond film (Ta/BDD) was deposited on tantalum substrat and used to detect aniline concentration by linear-sweep cathodic stripping voltammetry. Ta/BDD was deposited on tantalum using hot filament chemical vapor deposition (HFCVD) method. Raman spectroscopy and scanning electron microscopy (SEM) examinations demonstrated that the films electrode had well-defined diamond features. Electrochemical detection showed superb properties of Ta/BDD electrode: The window potential of Ta/BDD in aqueous solution is 4.1V (-1.8V-b-2.3V vs SCE)and its background current is extreme low ,which indicates it is an ideal electrode for electroanalysis. It was found that the dimeric species formed by oxidized Ta/BDD anodic oxidation of aniline during the accumulation period are involved in electrochemically reversible redox processes. No surface passivation was found in the process. In acidic media, the shape of the stripping voltammetric response is suitable for aniline detection. Linear response can be obtained in the range from 1 to 40μmol/L of aniline concentration.