Functional contrast and kinetic analysis of water-dispersible carbon black nanoparticles and MWNTs in glucose biosensors

Poly (sodium 4-styrenesulfonate) (PSS) was grafted onto carbon black surface by ambient surface-initiated atom radical transfer polymerization. And the carbon paste electrodes modified by CB-g-PSS and MWNTs were completed. CB-g-PSS and MWNTs had no effect on direct electron transfer based on the carbon paste electrode, but increased the redox speed of Fe [(CN)⁶]^3- / Fe[(CN)⁶]^4- and led to stronger current response. The experimental results indicate that the sensitivity of modified by CB-g-PSS is 2.1 times of no modified, and MWNTs is 4 times. Measurable linear range is 1.1 mmol/L~33.3 mmol/L. For sensors modified by CB-g-PSS, testing of different concentration glucose: RSD<7%; sensors modified by MWNTs, RSD<7.5% (glucose < 15 mmol/L), RSD<10% (glucose > 15 mmol/L) respectively.