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MOF-Derived Porous CeO $_{2 - x} / C$ $_{2 - x} / C$ Nanorods and Their Applications in Uric Acid Biosensor

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

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Jiewu Cui

http://orcid.org/0000-0003-4613-4795

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193 Tunxi Road, Hefei 230009, P. R. China

E-mail Address: jwcui@hfut.edu.cn

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Yan Wang

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193 Tunxi Road, Hefei 230009, P. R. China

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Dongbo Yu

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193 Tunxi Road, Hefei 230009, P. R. China

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Yongqiang Qin

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193 Tunxi Road, Hefei 230009, P. R. China

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Hongmei Zheng

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

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Yu Hong

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

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Yong Zhang

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193 Tunxi Road, Hefei 230009, P. R. China

E-mail Address: zhangyong.mse@hfut.edu.cn

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, and

Yucheng Wu

School of Materials Science and Engineering, Hefei University of Technology, No. 193 Tunxi Road, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, No. 193 Tunxi Road, Hefei 230009, P. R. China

China International S&T Cooperation Base for Advanced Energy and Environmental Materials, No. 193 Tunxi Road, Hefei 230009, P. R. China

E-mail Address: ycwu@hfut.edu.cn

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https://doi.org/10.1142/S1793292018500856Cited by:14 (Source: Crossref)

Abstract

Selectivity is significant to the practical applications of electrochemical biosensors in clinical and diagnostic field. In this paper, porous CeO $_{2 - x}$ $_{2 - x}$ /C nanorods (NRs) derived from Ce-based metal organic framework (MOF) were synthesized and employed as substrate to construct uric acid biosensors with high sensitivity and selectivity at low working potential. The morphology, microstructures and elemental states of as-prepared samples were investigated by SEM, XRD, TEM and XPS systematically. It was found that a great amount of oxygen vacancies was introduced into the interstitial of CeO₂ and nonstoichiometric CeO₂/C (CeO $_{2 - x}$ $_{2 - x}$ /C) nanorods based on Ce-MOF were formed under calcination in Ar atmosphere. The increased oxygen vacancies enabled the negatively shifting of the working potential towards H₂O₂ detection for CeO $_{2 - x}$ $_{2 - x}$ /C nanorods, favoring the construction of biosensors based on the detection of H₂O₂. Uric biosensors based on CeO $_{2 - x}$ $_{2 - x}$ /C NRs exhibited a high sensitivity of 220.0 $μ$ $μ$ A $\cdot$ $\cdot$ cm $^{- 2}$ $^{- 2}$ $\cdot$ $\cdot$ mM $^{- 1}$ $^{- 1}$ and a linear range from 50 $μ$ $μ$ M to 1000 $μ$ $μ$ M at working potential of $-$ $-$ 0.4V versus SCE. It also exhibited superior selectivity toward interferents coexisting with uric acid in urine due to the low working potential.

Keywords:

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