A new silver(I)-selective electrode based on derivatized MWCNTs@SiO₂ nanocomposites as a neutral carrier

详细信息	查看全文 | 推荐本文 |

• 作者：Qiang Zhao ; Yaqin Chai ; ^{yqchai@swu.edu.cn} ; Ruo Yuan ; Ting Zhang ; Chunli Yang
• 关键词：Carbon paste electrode ; Silver ; Potentiometric ; SiO2-coated MWCNTs (MWCNTs@SiO2) derivates
• 刊名：Materials Science and Engineering ; C
• 出版年：2012
• 期刊代码：63_09284931
• 类别：ms
• 出版时间：1 August, 2012
• 卷：32
• 期：6
• 页码：1352-1357
• 文件大小：753 K

摘要

For the first time a novel carbon paste electrode (CPE) for the detection of trace silver(I) was designed by using derivatized silica-coated multi-walled carbon nanotubes (MWCNTs@SiO₂) nanocomposites as a neutral carrier. This proposed electrode, with optimum composition, exhibits a wide dynamic range of 8.6 脳 10^鈭?#xA0;8 to 1.0 脳 10^鈭?#xA0;1 M toward silver(I) with a detection limit of 8.0 脳 10^鈭?#xA0;8 M and a Nernstian slope of 60.8 卤 0.2 mV dec^鈭?#xA0;1. Meanwhile, it also shows a good selectivity and a relatively fast response time (~ 20 s), a long lifetime (1 month) and a wide pH range (4.0-9.0). Finally, the developed CPEs were successfully applied in the potentiometric titration of potassium bromide and determination of Cl^{鈭?/sup> ions in different water samples.}