Abstract
We describe the use of individual zinc oxide (ZnO) micro/nanowires in an electrochemical biosensor for uric acid. The wires were synthesized by chemical vapor deposition and possess uniform morphology and high crystallinity as revealed by scanning electron microscopy, X-ray diffraction, and photoluminescence studies. The enzyme uricase was then immobilized on the surface of the ZnO micro/nanowires by physical adsorption, and this was proven by Raman spectroscopy and fluorescence microscopy. The resulting uric acid biosensor undergoes fast electron transfer between the active site of the enzyme and the surface of the electrode. It displays high sensitivity (89.74 μA cm−2 mM−1) and a wide linear analytical range (between 0.1 mM and 0.59 mM concentrations of uric acid). This study also demonstrates the potential of the use of individual ZnO micro/nanowires for the construction of highly sensitive nano-sized biosensors.
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Acknowledgments
This work was supported by the National Major Research Program of China (2013CB932600), the Program of International S&T Cooperation (2012DFA50990), NSFC (51232001, 51172022, 50972011), the Research Fund of Co-construction Program from Beijing Municipal Commission of Education, the Fundamental Research Funds for the Central Universities, Program for Changjiang Scholars and Innovative Research Team in University, and the Beijing novel program (2008B19) and the Program for New Century Excellent Talents (NCET-09-0219).
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Zhao, Y., Yan, X., Kang, Z. et al. Highly sensitive uric acid biosensor based on individual zinc oxide micro/nanowires. Microchim Acta 180, 759–766 (2013). https://doi.org/10.1007/s00604-013-0981-z
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DOI: https://doi.org/10.1007/s00604-013-0981-z