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The 3～〔rd〕International Conference on High-Performance Ceramics(CICC-3)（2）

作者： Zhoufu Wang , Houzhi Wang, Yanruo Hong and Chengji Deng Hubei Province Key Laboratory of Ceramics and Refractories, Wuhan University of Science and Technology, Wuhan 430081, China Department of inorganic materials, University of Science and Technology Beijing, Beijing 100083, China

Heterogeneous-nucleation formation of AlO coatings on graphite powders via a controlled hydrolysis process of aluminum chloride was investigated, and surface morphology and properties of the coated graphite were examined. The formed Al2O3 coatings were uniform and essentially amorphous. They were bonded well with graphite via chemical interaction between their O atoms and C atoms on graphite surface. graphite particle size increased from 7.61μm (as-received graphite) to 9.53 μm (the coated graphite), revealing that average thickness of the coating was -1μm. Compared with those of as-received graphite, specific surface area and fractal dimension of the coated graphite also increased, which was caused by the porosity present in the coating. The isolectric point (IEP) of the coated graphite (-9) was close to that of pure Al2O3, indicating that the electro-kinetic behavior of the coated graphite was similar to that of Al2O3.

关键词： graphite powders AI2O3 Coated Heterogeneous nucleation

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

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Journal of Materials Science & Technology 2020年第14期47卷 42-46页

作者： Kaili Yao Xiaojun Tan Bing Dai Jie Bai Qiaoyang Sun Wenxin Cao Jiwen Zhao Lei Yang Jiecai Han Jiaqi Zhu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin150080China

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 8.44×10^20 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 5μM-1 m M),and a low detection limit(~0.8μM)for detecting dopamine.

关键词： Boron doped diamond graphite powders Boron oxide powders Optical emission spectroscopy Dopamine

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