Ion-selective electrodes with three-dimensionally ordered macroporous carbon as the solid contact.
Electrodes with three-dimensionally ordered macroporous (3DOM) carbon as the intermediate layer between an ionophore-doped solvent polymeric membrane and a metal contact are presented as a novel approach to solid-contact ion-selective electrodes (SC-ISEs). Due to the well-interconnected pore and wall structure of 3DOM carbon, filling of the 3DOM pores with an electrolyte solution results in a nanostructured material that exhibits high ionic and electric conductivity. The long-term drift of freshly prepared SC-ISEs with 3DOM carbon contacts is only 11.7 microV/h, and does not increase when in contact with solution for 1 month, making this the most stable SC-ISE reported so far. The electrodes show good resistance to the interference from oxygen. Moreover, in contrast to previously reported SC-ISEs with conducting polymers as the intermediate layer, 3DOM carbon is an electron conductor rather than a semiconductor, eliminating any light interference.
Lai
Chun-Ze
CZ
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Fierke
Melissa A
MA
Stein
Andreas
A
Bühlmann
Philippe
P
D002244:Carbon / Q000737:chemistry*; D004553:Electric Conductivity; D017736:Ion-Selective Electrodes; D008670:Metals / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D011199:Potentiometry / Q000295:instrumentation / Q000379:methods; D012680:Sensitivity and Specificity; D012997:Solvents / Q000737:chemistry; D013997:Time Factors
D008670:Metals; D011108:Polymers; D012997:Solvents; D002244:Carbon; D010100:Oxygen