Abstract
Screen printed carbon electrode (SPCE) has been modified with single wall carbon nanotube/poly(3,4-ethylenedioxythiophene) (SWCNT/PEDOT) composites for the determination of phenol and chlorophenols (phenol, 4-chlorophenol, 2,4-dichlorophenol, and 2,4,6-trichlorophenol). The effect of the modifiers on the electrode characteristics was evaluated and the responses were optimized for the voltammetric determination of phenol and chlorophenols. The parameters affecting the responses such as pH, scan rate, and stability were studied. The analytical performance of the SWCNT/PEDOT/SPCE using cyclic voltammetry was tested and found to be impressive. Under these conditions, the designed electrode showed a good performance for the voltammetric measurements of the phenolic compounds. The modified SPCE, when it is compared with other enzymatic and nonenzymatic sensors, showed a wider dynamic range for the detection of the phenolic compounds. The modified SPCE was used for the quantification of phenol in water samples. The results suggest that the method is quite useful for analyzing and monitoring phenols and chlorophenols.
Highlights
Screen printing technique seems to be one of the most promising approaches allowing simple, versatile, rapid, and low cost sensor/biosensor production [1]
Tyrosinase based biosensors with PEDOT/Poly(styrene sulphonate) modified SPCE allowed the detection of phenolic compounds with significantly improved sensitivity and wider linear range when compared to Tyrosinase immobilized on screen printed carbon electrode [16]
SWCNTs were successfully incorporated in PEDOT and were used to modify bare SPCEs
Summary
Screen printing technique seems to be one of the most promising approaches allowing simple, versatile, rapid, and low cost sensor/biosensor production [1]. Electrochemical sensors based on screen printed electrodes are simple to be used with in situ screening devices, since all the equipment needed for the electrochemical analysis is portable They have all the basic performance characteristics of sensors, among them the requirement of minimum sample preparation, simplicity of the apparatus, fast responses, low cost, and miniaturization with new technologies [7, 8]. Tyrosinase based biosensors with PEDOT/Poly(styrene sulphonate) modified SPCE allowed the detection of phenolic compounds with significantly improved sensitivity and wider linear range when compared to Tyrosinase immobilized on screen printed carbon electrode [16]. The study focused on the development of screen printed carbon electrode modified with the composites of SWCNT/PEDOT for the investigation of the electrochemical behavior and determination of phenol and chlorophenols
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