An electrochemiluminescent sensor for methamphetamine hydrochloride based on multiwall carbon nanotube/ionic liquid composite electrode

In this article, a composite paste electrode consisted of multiwall carbon nanotube (MWCNT) and room temperature ionic liquids (RTILs) was developed for fabrication of electrochemiluminescence (ECL) sensor. The electrochemical and ECL behaviors of this sensor were investigated in detail. This ECL sensor exhibited extraordinary stability during long-term potential cycling. It was found that the light emission of this ECL sensor could be enhanced by methamphetamine hydrochloride (MA·HCl) dramatically. Based on which, a new method based on this ECL sensor has been developed for determination of MA·HCl. The method exhibited a good reproducibility, wide-range linearity, high sensitivity and stability with a detection limit (signal-to-noise ratio = 3) of 8.0 × 10−9 mol/L, and the relative standard deviation was 3.1% for 1 × 10−5 mol/L MA·HCl (n = 10).