Electrochemical determination of dopamine using a glassy carbon electrode modified with a nanocomposite consisting of nanoporous platinum-yttrium and graphene

Abstract

A nanoporous platinum-yttrium alloy (NP-PtY) was fabricated by dealloying ribbons of a PtYAl alloy. Owing to the high porosity and the synergistic effect of Y in the Pt backbone, the NP-PtY exhibits superior structural stability, reproducibility and electrocatalytic activity. An electrochemical sensor was developed for the highly sensitive and selective detection of dopamine (DA) based on the use of a glassy carbon electrode modified with NP-PtY alloy and graphene. The sensor, best operated at 0.16 V vs. SCE, has a linear range covering the 0.9 to 82 μM concentration range, a 0.36 μM detection limit (at S/N = 3), and good selectivity over tyramine, tryptamine, phenethylamine, uric acid, and ascorbic acid. It gave satisfactory results in the determination of DA in spiked samples of urine.

Nanoporous platinum-yttrium alloy (NP-PtY) was fabricated by means of a one-step dealloying process. A glassy carbon electrode modified with the NP-PtY and graphene nanocomposite exhibits a wide linear range and a low detection limit towards dopamine. The sensor has remarkable reproducibility, stability and selectivity.

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Acknowledgements

We greatly appreciate the support of the National Natural Science Foundation of China (51371004), the Major Natural Science Foundation of Jiangsu Provincial Education Department (16KJA150007, 13KJA430001) and the Qing Lan Project (SZ2014005).

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Correspondence to Rongjing Cui or Genhua Zhang.

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Chen, D., Tian, C., Li, X. et al. Electrochemical determination of dopamine using a glassy carbon electrode modified with a nanocomposite consisting of nanoporous platinum-yttrium and graphene. Microchim Acta 185, 98 (2018). https://doi.org/10.1007/s00604-017-2624-2

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Keywords

  • Electrochemical sensor
  • Transmission electron microscopy
  • Cyclic voltammograms
  • Dealloying
  • Differential pulse voltammetry