Sodium ion sensitive microelectrode based on a p-tert-butylcalix[4]arene ethyl ester

I. Marques de Oliveira (1) , D. Risco (1) , F. Vocanson (2) , E. Crespo (3) , F. Teixidor (3) , N. Zine (4) , J. Bausells (4) , J. Samitier (1) , Abdelhamid Errachid (1)

1 Lab NanoBioEngn
2 LACE - Laboratoire d'Application de la Chimie à l'Environnement
3 ICMAB - Institut de Ciència de Materials de Barcelona
4 CNM - Centro Nacional de Microelectronica [Spain]

Planar sodium-selective potentiometric microelectrodes with a conducting polymer (polypyrrole doped with cobaltabis(dicarbollide) ions ([3,3'-Co(1,2-C2B9H11)2]-)) as solid contact layer between the polymeric sensitive membrane and the platinum substrate have been constructed. The p-tert-butylcalix[4]arene ethyl ester was used as ionophore for sodium recognition. The microelectrode shows a linear response for Na+ concentrations between 3.0×10-6 M and 1.0×10-1 M with a Nernstian slope of 58.65 ± 2 mV per decade and a detection limit of 1.45×10-6 M. The response time was 14 s, and the electrode is suitable for use within the pH range of 3-10.

Keywords: Sodium; polypyrrole; calix[4]arene; Solid-state ion selective microelectrode; Potentiometric

Domains: Material chemistry

I. Marques de Oliveira, D. Risco, F. Vocanson, E. Crespo, F. Teixidor, et al.. Sodium ion sensitive microelectrode based on a p-tert-butylcalix[4]arene ethyl ester. Sensors and Actuators B: Chemical, 2008, 130 (1), pp.295. ⟨ujm-00350754⟩