中文摘要：

以纳米氮化钛（TiN）为电活性物质,制备了用于检测青霉素的纳米TiN修饰碳糊电极.研究了该碳糊电极中石墨与纳米TiN的质量比、电极面积、溶液pH值及缓冲容量等因素对青霉素检测效果的影响.结果表明,在优化的条件（石墨与TiN的质量比为2∶1,电极面积为1 mm2,溶液pH值为7.2以及缓冲容量为20 mmol/L KH2PO4）下,该电极检出限为2×10-5mol/L,线性检测范围为4×10-53.2×10-3mol/L.利用Zeta电位及交流阻抗的方法,揭示了纳米TiN碳糊电极检测青霉素的机理为纳米TiN对青霉素的特异性吸附.纳米TiN碳糊电极展现出良好的稳定性、选择性和重复性,在青霉素检测领域具有广阔的应用前景.

英文摘要：

A titanium nitride nanoparticles（ Ti N） modified carbon paste electrode was prepared to detect penicillin. The effects of the mass ratio of titanium nitride to graphite,electrode area,p H value and concentration of the buffer solution on the detection of penicillin were studied. With the optimized conditions,the electrode offered a minimum detection limit of 2 × 10-5mol/L and a linear dynamic range of 4 × 10-5—3. 2×10-3mol/L. Moreover,the detection mechanism was an adsorption action,which was revealed by the zeta potential and electrochemical impedance spectroscopy characterizations. Overall,the Ti N modified carbon paste electrode shows good stability,high selectivity,excellent repeatability and a promising application in penicillin detection.