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Issue 44, 2016
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Sustainable one-pot integration of ZnO nanoparticles into carbon spheres: manipulation of the morphological, optical and electrochemical properties

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Abstract

ZnO–carbon composite spheres were synthesized via starch hydrothermal carbonization (HTC) in the presence of a soluble zinc salt (acetate), followed by thermal processing under an argon atmosphere. Besides sustainability, the one-pot procedure represents a scalable synthesis of tailored carbon–metal oxide spheres with a structurally-ordered carbon matrix obtained at a relatively low temperature (700 °C). The ability of zinc cations to develop different linkages with starch's hydrophilic functional groups and to act as external nucleators determines an increase in HTC yield; the effect is obvious even in the presence of small concentrations of zinc in the reaction medium (0.005 M), thus providing a way to improve the carbonization process efficiency. It is also shown that zinc content is the control vector of the spherical composite’s properties: a variation from 0.3 to 4.8 at% not only induces a variation in their size (200 nm–10 μm), interconnectivity (from disperse spheres to necklace-like aggregations), surface area and connected porosity (from micro- to mesoporosity), but also of their electrochemical and white light adsorption and emission features. Since the variation in zinc content is made by a simple adjustment of the raw material concentrations, the functionality of these carbon-based materials can be modulated in a straightforward manner.

Graphical abstract: Sustainable one-pot integration of ZnO nanoparticles into carbon spheres: manipulation of the morphological, optical and electrochemical properties

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Publication details

The article was received on 26 Aug 2016, accepted on 14 Oct 2016 and first published on 14 Oct 2016


Article type: Paper
DOI: 10.1039/C6CP05911B
Citation: Phys. Chem. Chem. Phys., 2016,18, 30794-30807
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    Sustainable one-pot integration of ZnO nanoparticles into carbon spheres: manipulation of the morphological, optical and electrochemical properties

    G. Patrinoiu, J. M. Calderon-Moreno, R. Birjega, D. C. Culita, S. Somacescu, A. M. Musuc, T. Spataru and O. Carp, Phys. Chem. Chem. Phys., 2016, 18, 30794
    DOI: 10.1039/C6CP05911B

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