Intercrystallite boundaries dominate the electrochemical corrosion behavior of polycrystalline diamond
نویسندگان
چکیده
In this work, high resolution integrated AFM–EC/SECM was used to reveal the spatially heterogeneous electroactivity of microcrystalline diamond (MCD) and nanocrystalline (NCD) surfaces. During electrochemical corrosion, NCD surfaces undergo a stronger corrosion reaction than MCD because higher amount sp2 hybridized carbon. In-situ EC-AFM imaging shows no significant change in surface morphology, while corroded become more hydrophilic due oxidation reactions that occur outermost layer. On non-corroded surfaces, intercrystallite boundaries exhibit localized (electro)chemical reactivity crystallites. However, after both thermodynamically stabilized by products passivate inhibit further corrosion. way, is reduced greater extent crystallites intense taking place at these boundaries. After results comparatively on This behavior suggests following order reactivity: > sp3 oxidized/passivated structures.
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ژورنال
عنوان ژورنال: Carbon
سال: 2022
ISSN: ['0008-6223', '1873-3891']
DOI: https://doi.org/10.1016/j.carbon.2022.08.038