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| Detection of Dissolved Oxygen Using an Electrochemiluminescence Based on Tetraphenylethylene Self assembled Film Amplification |
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| DOI： |
| KeyWord:luminol tetraphenylethylene(TPE) dissolved oxygen detection electrochemiluminescence(ECL) |
| Author | Institution |
| ZHANG Lin-lin,BAO Xin-jing,LU Li-ping |
College of Environmental & Energy Engineering,Beijing University of Technology |
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| Abstract: |
| In this paper,a new luminol electrochemiluminescence signal enhancement technique based on tetraphenylethylene(TPE) modified electrode was developed for the determination of dissolved oxygen in solution.TPE molecules were modified on the surface of gold electrode to form porous and amorphous self assembled films at room temperature.Oxygen molecules and superoxide radical O·-2 were efficiently captured due to the synergistic effect between the enlarged specific surface area of the electrode and the pores,thus the electrochemiluminescence intensity of luminol solution was enhanced.TPE modified electrode exhibited high stability and good reproducibility.The ECL intensity of luminol was changed by adding nitrogen to remove oxygen at different times,then the concentration of dissolved oxygen in the solution could be calculated quantitatively.Results showed that there was a good linear relationship between nitrogen duration(1-6 min) and concentration of dissolved oxygen in the range of 1.63-0.190 mg/L with a correlation coefficient(r2) of 0.990 9.The detection limit for initial concentration of dissolved oxygen was 1.89 mg/L.With the advantages of convenience,rapidness,sensitivity,the method provides a new approach for the detection of dissolved oxygen. |
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