Modified potentiometric Sensor for Yb(III) based on Cefixime and Quaternary-doped Graphene

A carbon-based electrode was modified through incorporating N, S, P and B quaternary-doped graphene (NSPBG) in its composition, and given that former studies indicated a selective interaction between cefixime (CEF) and Yb3+ ions in comparison to other lanthanide ions. Therefore, CEF was further incorporated in the CPE composed of a mixed matrix of NSPBG and graphite powder to develop an Yb3+ selective potentiometric carbon paste electrode, and evaluations of the modified CPE reflected that high sensitivity, selectivity; short response time and stability, as well as improved lifetime as opposed to CPEs based on the multiwall carbon nanotube (MWCNTs). The optimized electrode with a composition of 7% NSPBG, 13% CEF, 30% IL and 50 % graphite powder, had a Nernstian response of 19.7±0.1 mV per decade over the concentration range of 1.0×10-7 to 1.0×10-2 M.