[Ru (bpy)3(2+) electrochemi-luminescence of screen-printed electrodes for low cost disposable C2O4(2-) sensor]

The present paper reports the establishment of an electrochemi-luminescence (ECL) sensor by using screen-printed electrodes(SPE) which contain Ru(bpy)3(2+). The method of making the SPE and the fix of Ru(bpy)3(2+) were studiedin detail. The characters of the sensor were studied. The sensor has been applied to detect C2O4(2-) in solution. Under optimised conditions, at 1.55 V vs. Ag/AgCl, in 0.2 mol x L(-1) phosphate buffer solution (pH 6.0), the linger range extends from 3.0 x 10(-7) mol x L(-1) to 1.0 x 10(-5) mol x L(-1), the detection limit is 1.2 x 10(-7) mol x L(-1) (S/N=3). The sensors have good stability and reproductivity. It should be noted that based on the same principle, the sensors can be applied to detect many other compounds, such as amino acids, TprA and NAD. If the screen machine is used to make the SPE, the reproductivity and stability of the SPEs can be improved further.