Journal
ELECTROCHIMICA ACTA
Volume 271, Issue -, Pages 84-91Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.03.133
Keywords
Porous boron-doped diamond; Au nanoparticles; Long-term stability; Dopamine; Electrochemistry
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Funding
- National Natural Science Foundation of China [51601226, 51302173]
- National Key Research and Development Program of China [2016YEB0301402, 2016YFB0402705]
- State Key Laboratory of Powder Metallurgy
- Open-End Fund for Valuable and Precision Instruments of Central South University
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A porous boron-doped diamond (pBDD) was made for immobilizing gold nanoparticles on BDD facets by a special process, wherein methods of magnetron sputtering and thermal catalytic treatment were utilized. Au nanoparticles are seated in the pores of pBDD facets and could be more stable during electrochemical tests. This hybrid structure significantly improved the electrochemical properties due to the introduction of Au nanoparticles and pores, which could increase the specific surface area. The cyclic voltammetry oxidation peak current of the Au/pBDD electrode decreased with an average daily loss of 0.02 mA and maintained approximately 90.1% of its initial value after detecting dopamine once per two days for 30 days, showing an excellent long-term electrochemical stability. In addition, the Au/pBDD electrode exhibited excellent sensitivity for the detection of DA, and the limit of detection was 0.06 mM in a linear concentration range of 0.1 mu M-1 mM. This work indicates that the Au/pBDD is an appropriate material for detecting DA in a long-term tests. (C) 2018 Elsevier Ltd. All rights reserved.
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