Multi-walled carbon nanotubes/graphene nanoribbons hybrid materials with superior electrochemical performance

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• 作者：Javier Hern谩ndez-Ferrer ; Pablo Laporta ; Fabiana Guti茅rrez ; Mar铆a D. Rubianes ; Gustavo Rivas ; M陋 Teresa Mart铆nez
• 关键词：Graphene nanoribbons ; Hybrid materials ; Electrochemical sensing
• 刊名：Electrochemistry Communications
• 出版年：February, 2014
• 年：2014
• 卷：39
• 期：Complete
• 页码：26-29
• 全文大小：779 K

文摘

Graphene nanoribbons (GNRs) were synthesized by oxidation of arc discharge multi-walled carbon nanotubes (MWCNTs) in concentrated H₂SO₄ using KMnO₄ as oxidizing agent at different times from 15 to 120 min. One of the GNR samples was further electrochemically and chemically reduced. The material obtained after 15 min of oxidation time (GNR₀₁₅) was a hybrid material containing MWCNTs, partially unzipped GNRs-MWCNTs and fully unzipped GNRs, and it demonstrated a superior electrochemical performance. This material presented the highest heterogeneous charge transfer constant and sensitivity towards H₂O₂ reduction. These properties are due to the balance between the content of unzipped MWCNTs, C_sp2 carbon structure and oxygen moieties. GNR₀₁₅, thus reveals as a promising platform for further applications in electrochemical sensing.