Au nanospheres modified boron-doped diamond microelectrode grown via hydrogen plasma etching solid doping source for dopamine detection

doi:10.1016/j.jmst.2020.02.003

Abstract

Abstract:

Boron doped diamond (BDD) electrode is a promising electrochemical material for detecting dopamine level in the human’s body. In this work, we developed a new doping source - graphite and solid boron oxide powders to synthesize BDD film with microwave plasma chemical vapor deposition, so as to avoid using toxic or corrosive dopants, such as boroethane and trimethylborate. The synthesized BDD film is pinhole free and with high doping density of 8.44 × 10²⁰ cm^-3 calculated from the Raman spectroscopy. Subsequently, Au nanospheres were decorated on the surface of BDD film to improve electrochemical performance of the BDD film. The Au nanoparticles modified BDD electrode demonstrates an excellent electrochemical response, a high sensitivity (in the range of 5 μM-1 mM), and a low detection limit (~ 0.8 μM) for detecting dopamine.

Key words: Boron doped diamond, Graphite powders, Boron oxide powders, Optical emission spectroscopy, Dopamine

Kaili Yao, Xiaojun Tan, Bing Dai, Jie Bai, Qiaoyang Sun, Wenxin Cao, Jiwen Zhao, Lei Yang, Jiecai Han, Jiaqi Zhu. Au nanospheres modified boron-doped diamond microelectrode grown via hydrogen plasma etching solid doping source for dopamine detection[J]. J. Mater. Sci. Technol., 2020, 49: 42-46.

Figures/Tables 6

Fig. 1. Schematic illustrations of making doping source with graphite and B2O3 powders (a, b); (c-e) process for the growth of BDD film; (f, g) manufacturing Au nanospheres modified BDD film.

Fig. 2. SEM images of pure BDD film (a, b) and Au nanoparticles modified BDD film (c, d) with low (a, c) and higher (b, d) magnification. The inset in (d) was EDS of Au nanoparticles modified BDD.

Fig. 3. OES for plasma induced by hydrogen etching mixture of graphite and B2O3 after 30 min.

Fig. 4. Raman spectra of (a) BDD film and (b) Au nanoparticles modified BDD film.

Fig. 5. (a) CVs of Au nanospheres modified BDD electrode in 0.1 M PBS under different scan rates: 0.02, 0.04, 0.06, 0.08, 0.1, 0.2 V s-1 in 10 μM DA; (b) Linear curves of peak currents versus square root of scan rate.

Fig. 6. (a) DPVs of Au nanospheres modified BDD electrode in 0.1 M PBS with increasing amounts of DA concentration from 5 μM to 1 mM. The inset is the magnified CPV curves in 5 and 10 μM; (b) Linear curves of peak currents versus the DA concentration.

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