Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5009975 | Sensors and Actuators B: Chemical | 2017 | 10 Pages |
â¢The BrO3â sensor was a novel design based on Fe(III)P and PSS integrated LbL assembly.â¢The current cathodic response showed a maximum value at the two layers of Fe(III)P.â¢The detection limit of BrO3â was 43 nM by using the proposed LbL sensor.â¢The proposed LbL sensor has acceptable anti-interference property.
A novel amperometric sensor for bromate (BrO3â) was developed using the layer-by-layer (LbL) assembly process of iron(III)-porphyrin (Fe(III)P) and polyelectrolytes alongside oxidized multiwall carbon nanotubes (OMWCNTs) on a disposable screen-printed carbon electrode (SPCE). Positively charged Fe(III)P and negatively charged poly(sodium 4-styrenesulfonate) (PSS) were used as structure blocks for LbL assembly on the OMWCNTs modified SPCE. The electrocatalytic response by Fe(III)P from the amperometric LbL sensor for determining BrO3â concentration was characterized using cyclic voltammetry. Critical experimental parameters affecting the sensor's performance were optimized, including the number of assembled layers, pH of the buffer solution, and concentration of Fe(III)P immobilized on the electrode surface. A linear response from 100 nM to 2.5 mM of BrO3â in 0.2 M SAB solution with a sensitivity of 115.2 μA mMâ1 and a detection limit of 43 nM were achieved with good selectivity. As a final demonstration, the proposed LbL sensor, [Fe(III)P-PSS]1-Fe(III)P-OMWCNTs/SPCE, was applied to analyze BrO3â concentrations in tap water and mineral water samples.