Abstract
Graphitized multiwalled carbon nanotubes (GMWNTs) were ground with 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF6) containing dissolved cetyltrimethylammonium bromide (CTAB), and a CTAB-[Bmim]PF6-GMWNT nanocomposite was obtained. The nanocomposite had a regular arrangement, and no agglomeration was observed, in contrast with the case of a bucky gel ([Bmim]PF6-GMWNTs). CTAB-[Bmim]PF6-GMWNT showed significantly lower electron impedance toward an [Fe(CN)6]3−/4− anion probe, compared with [Bmim]PF6-GMWNT, and it was shown (using Fourier transform infrared spectroscopy and UV–visible spectroscopy) that CTAB-[Bmim]PF6-GMWNT acted as a biocompatible matrix for the self-assembly of haemoglobin molecules. Furthermore, the faradaic current (31.77 μA) resulting from the direct electron transfer in self-assembled haemoglobin on a CTAB-[Bmim]PF6-GMWNT-modified glass carbon electrode (GCE) was ~35.5 times larger than that measured for haemoglobin on a [Bmim]PF6-GMWNT-modified GCE (0.8941 μA). The haemoglobin anchored on the CTAB-[Bmim]PF6-GMWNTs/GCE showed a more sensitive response to hydrogen peroxide (H2O2) compared with other electrodes reported in the literature. The CTAB-functionalized bucky gel nanocomposite was biocompatible and showed beneficial characteristics that could be useful for applications in biological engineering.
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Acknowledgments
We appreciate financial support from the Foundation of the State Key Laboratory of Analytical Chemistry for Life Science (SKLACLS1205), the Natural Science Foundation of Zhejiang Province (LQ12B05005), the Program for Science and Technology of Zhejiang Province (2013C32038), the Science and Technology Innovation Program of Zhejiang Province’s University Student (2014R417005). We are grateful for the help of Professor Jun-Jie Zhu of Nanjing University.
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Yin, ZZ., Li, L., Zhou, SM. et al. Novel cetyltrimethylammonium bromide-functionalized bucky gel nanocomposite for enhancing the electrochemistry of haemoglobin. J Solid State Electrochem 19, 1551–1557 (2015). https://doi.org/10.1007/s10008-015-2769-z
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DOI: https://doi.org/10.1007/s10008-015-2769-z