摘要
构建了一种电势稳定性好的全固态钙离子选择电极(Ca~(2+)-ISE),采用碳纳米管(CNT)/Ag/MoS_2为转导层,自制的三脚架化合物作为钙离子载体,制备固体接触式Ca~(2+)-ISE。系统分析了全固态Ca~(2+)-ISE的稳定性、能斯特斜率、响应范围、选择性系数等主要性能,发现制备的固体接触式Ca~(2+)-ISE在钙离子浓度为1×10~(-6)~1×10~(-1)mol/L范围内呈现线性能斯特响应,响应斜率为28. 1 mV/decade。CNT/Ag/MoS_2的引入有利于提高固体接触式Ca~(2+)-ISE的离子浓度线性响应范围,缩短电势平衡时间,降低测试能斯特斜率与理论值差,对于Ca~(2+)-ISE的长期在线检测有重要研究意义。
An all-solid-state Ca~(2+) ion selective electrode( Ca~(2+)-ISE) was prepared with carbon nanotube( CNT)/Ag/MoS_2 as the ion-to-electron transducer and tripodal compound as the calcium ionophore. The stability,slope,response range,selectivity coefficient,etc. of the electrode were investigated. It is revealed that the electrode exhibits a 28. 1 mV/decade Nernst slope in the range of 1 × 10~(-6)~ 1 × 10~(-1) mol/L Ca~(2+) concentration. The transducer is helpful in enlarging the linear response range of the Ca~(2+)concentration,shortening the potential balance time and reducing the difference of the Nernst slope. All of these results are important for long-term online detection of calcium ions for the solid electrode.
引文
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