Electrochemical Synthesis of Carbon Fluorooxide Nanoparticles from 3C-SiC Substrates

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• 作者：Sergei Alekseev ; Dmytro Korytko ; Maksym Iazykov ; Sergei Khainakov ; Vladimir Lysenko
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：September 3, 2015
• 年：2015
• 卷：119
• 期：35
• 页码：20503-20514
• 全文大小：689K
• ISSN：1932-7455

文摘

Chemical nature of products, formed during electrochemical dissolution of polycrystalline 3C-SiC substrate in HF:ethanol mixture, was studied by means of FTIR spectroscopy, temperature-programmed desorption mass spectrometry (TPD-MS), ¹H, ¹³C, and ¹⁹F NMR (solution as well as MAS), XPS, AFM, and other characterization methods. Simultaneous formation of two major products, porous SiC and carbon fluorooxide (CFO) nanoparticles (NPs) with sizes of 1鈥?0 nm, is described. CFO NPs easily dissolve in polar organic solvents (ethanol, CH₂Cl₂, etc.); their solutions demonstrate intense yellowish-green photoluminescence under UV excitation. A model of the CFO chemical structure based on relatively small graphene domains interconnected with partially fluorinated hydrocarbon groups and terminated by carboxylic acid (鈭扖O₂H), ethyl ester (鈭扖O₂C₂H₅), perfluorinated functional groups, and polycarboxylated alkyl chains is proposed. Presence of carboxylates allows easy functionalization of the CFO NPs via amide chemistry. In particular, grafting of octadecyl groups makes CFO NPs soluble in hydrocarbons.