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Sputtering deposition of Pt nanoparticles on vertically aligned multiwalled carbon nanotubes for sensing L-cysteine

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Abstract

A highly sensitive electrochemical sensor for determination of L-cysteine (CySH) is presented. It is based on vertically aligned multiwalled carbon nanotubes modified with Pt nanoparticles by magnetron sputtering deposition. The morphology of the nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy and energy-dispersive. The electrochemistry of CySH was investigated by cyclic voltammetry, differential pulse voltammetry and chronoamperometry. The mechanism for the electrochemical reaction of CySH at the modified electrode at different pH values is discussed. The electrode exhibits a higher electrocatalytic activity towards the oxidation of CySH than comparable other electrodes. It displays a linear dependence (R 2 = 0.9980) on the concentration of CySH in the range between 1 and 500 μM and at an applied potential of +0.45 V, a remarkably low detection limit of 0.5 μM (S/N = 3), and an outstandingly high sensitivity of 1.42 × 103 μA mM−1 cm−2, which is the highest value ever reported. The electrode also is highly inert towards other amino acids, creatinine and urea. The sensor was applied to the determination of CySH in urine with satisfactory recovery, thus demonstrating its potential for practical applications.

Pt nanoparticles on carbon nanotubes by sputtering deposition show high performance for L-cysteine sensing

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Acknowledgements

The financial support by National Natural Science Foundation of China (No.20773041), the Research Fund for the Doctoral Program of Higher Education (No. 20070561008), and the high technology research program, Ministry of Science and Technology of China (2008AA06Z311) to the work was gratefully acknowledged.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, People’s Republic of China

    Min-Ling Ye, Bin Xu & Wei-De Zhang

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  1. Min-Ling Ye
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  2. Bin Xu
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  3. Wei-De Zhang
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Correspondence to Wei-De Zhang.

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Fig. S1

Peak potential of CySH oxidation at the Pt/VACNTs electrode against square root of the logarithm of scan rate (ν) (DOC 87 kb)

Fig. S2

Effect of work potential on the amperometric response of CySH. Supporting electrolyte: PBS (pH 6.5, 0.10 M); CySH concentration: 1.0 mM (DOC 142 kb)

Fig. S3

Long-term stability of the Pt/VACNTs sensor at room temperature (DOC 127 kb)

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Ye, ML., Xu, B. & Zhang, WD. Sputtering deposition of Pt nanoparticles on vertically aligned multiwalled carbon nanotubes for sensing L-cysteine. Microchim Acta 172, 439–446 (2011). https://doi.org/10.1007/s00604-010-0508-9

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  • DOI: https://doi.org/10.1007/s00604-010-0508-9

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