摘要
研究了适合作为离子选择电极的HgI_2-Ag_2S-As_2S_3和HgS-Ag_2S-As_2S_3系统的玻璃形成区。通过对这些玻璃性质与结构分析,发现xHgI_2·(100-x)(0.5Ag_2S·0.5As_2S_3]系列玻璃是很好的传感膜材料。采用该系列玻璃制成了对Ag^+离子10^(-6)～10^(-1)mol/L浓度范围具有能斯特响应斜率60mV/mol·L^(-1)和对Hg^(2+)离子10^(-6)～10^(-1)mol/L浓度具有能斯特斜率30mV/mol·L^(-1)的电极。这些电极具有优良的电化学性能。结合非晶态固体电解质的离子迁移模型,提出了这类硫系玻璃屯极的响应机理。
The new glasses froming regions of HgI_2-Ag_2S-As_2S_3 system and HgS-Ag_2S-As_2S_3 system which are suitable for making ion-selective electrodes were obtained. The series of xHgI_2·(100-x)(0.5 Ag_2S·0.5 As_2S_3) glasses were found to be an excellent sensing membrane materials through comparing and analysing the properties and structures of the two system glasses. By using the serial glasses, the ion-selective electrodes which respond to Ag^+ ions in 10_(-6)～10^(-1)mol/L with Nernstian slope of 60 mV/mol. L-(-1) and to Hg^(2+) ions in 10^(-6)～10^(-1) mol/L with the slope of 30mV/mol·L^(-1) were prepared. These electrodes show excellent electrochemical properties. Based on the models of ion-transport in vitreous solid electrolyte, the mechanism for the ion-selective response of the chalcogenide glass electrodes was proposed.
关键词
硫系
玻璃电极
离子选择电极
chalcogenide glass semiconductors
solid electrolyte
ion-selective electrode
electrochemical analysis
glass electrode
