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Issue 3, 2016
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CVD synthesis of carbon spheres using NiFe-LDHs as catalytic precursors: structural, electrochemical and magnetoresistive properties

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Abstract

The gram-scale synthesis of carbon spheres with a diameter of ca. 740 nm has been achieved by means of a chemical vapour deposition method using NiFe-layered double hydroxides as a solid catalytic precursor. The presence of the catalyst (FeNi3) allows controlling the final size distribution, resulting in a monodisperse sample. Their structural properties exhibited a high degree of graphitization according to their ID/IG ratio. In addition, their morphological features were unveiled by FIB-SEM and HRTEM, showing that they are formed by solid inner cores, and presenting labile chain-like structures due to accretion procedures. The solution and posterior sonication of the samples in toluene gave rise to the well-defined isolated spheres. The textural and electrochemical properties of the spheres have been tested showing non-mesoporous structures with a good behaviour as electrode materials for supercapacitors due to the presence of redox functionalities on their surface. Finally, magneto-transport measurements have been carried out, demonstrating semiconductor behaviour, as well as a positive magnetoresistance effect (ca. 72%) for the lowest studied temperature (2 K).

Graphical abstract: CVD synthesis of carbon spheres using NiFe-LDHs as catalytic precursors: structural, electrochemical and magnetoresistive properties

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Publication details

The article was received on 11 Sep 2015, accepted on 09 Nov 2015 and first published on 10 Nov 2015


Article type: Paper
DOI: 10.1039/C5TC02861B
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Citation: J. Mater. Chem. C, 2016,4, 440-448
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    CVD synthesis of carbon spheres using NiFe-LDHs as catalytic precursors: structural, electrochemical and magnetoresistive properties

    J. A. Carrasco, H. Prima-Garcia, J. Romero, J. Hernández-Saz, S. I. Molina, G. Abellán and E. Coronado, J. Mater. Chem. C, 2016, 4, 440
    DOI: 10.1039/C5TC02861B

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