A Modified Ho3+ Carbon Paste Electrode Based on Multi-walled Carbon Nanotubes (MWCNTs) and Nanosilica

作者：Ganjali Mohammad Reza^*; Motakef Kazemi Negar; Norouzi Parviz; Khoee Sepideh

来源：International Journal of Electrochemical Science, 2009, 4(7): 906-913.

• multi-walled carbon nanotubes
• nanosilica
• sensor
• Ho3+ ions
• carbon paste ion selective

A novel carbon paste ion selective electrode for determination of trace amount of holmium was prepared. Multi-walled carbon nanotubes (MWCNTs) and nanosilica were used for improvement of a holmium carbon paste sensor response. MWCNTs have a good conductivity which helps the transduction of the signal in carbon paste electrode. The electrode composition of 20% paraffin oil, 52% graphite powder, 20% ionophore, 5% MWCNTs, and 3% nanosilica showed the stable potential response to Ho3+ ions with the Nernstian slope of 19.9 (+/- 0.3) mV decade(-1) over a wide linear concentration range of 10(-7)-10(-2) mol L-1. The electrode has fast response time, and long term stability (more than 2 months).

• 出版日期2009-7