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Enhanced electrochemical detection performance of multiwall carbon nanotubes functionalized by aspartame

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Abstract

Inexpensive, non-toxic, and biocompatible materials that can disperse multiwall carbon nanotubes (MWCNTs) in aqueous solutions through a non-covalent approach while retaining their unique electronic and photonic properties are highly preferred. In this article, we introduce the use of an amphiphilic dipeptide derivative, aspartame, as an effective dispersing agent in preparing highly stable suspensions under ultrasonication. The results demonstrate that aspartame was absorbed by the nanotube surface possibly because of non-covalent π–π stacking between the aromatic group of aspartame and the CNT backbone. In addition, the resulting MWCNT/aspartame composites remained stably dispersed over a wide range of pH values. The chronoamperometric measurements of MWCNT/aspartame composite-coated electrodes for hydrogen peroxide demonstrated better electrochemical detection performance, as characterized by significantly enhanced step current, higher sensitivity, and reduced potential compared with bare electrodes.

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Acknowledgements

This study was supported by the Program for New Century Excellent Talents in Chinese University (NCET-11-0372), the Ministry of Science and Technology of China (Nos. 2012BAD29B05, 2012YQ090194 and 2012AA06A303), the Natural Science Foundation of China (21276192, 51173128 and 31071509), and the Program of Introducing Talents of Discipline to Universities of China (B06006).

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Authors and Affiliations

  1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin, 300072, China

    Miao Liang, Fengmin Jin, Rui Liu, Rongxin Su, Wei Qi, Yanjun Yu & Zhimin He

  2. Hunan Entry-Exit Inspection and Quarantine Bureau, Changsha, 410001, China

    Libing Wang

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  1. Miao Liang
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  2. Fengmin Jin
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  3. Rui Liu
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  4. Rongxin Su
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  5. Wei Qi
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  6. Yanjun Yu
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  7. Libing Wang
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  8. Zhimin He
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Correspondence to Rongxin Su or Libing Wang.

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Liang, M., Jin, F., Liu, R. et al. Enhanced electrochemical detection performance of multiwall carbon nanotubes functionalized by aspartame. J Mater Sci 48, 5624–5632 (2013). https://doi.org/10.1007/s10853-013-7357-y

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