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Vapor–Dissociation–Solid Growth of Three-Dimensional Graphite-like Capsules with Delicate Morphology and Atomic-level Thickness Control
journal contribution
posted on 2016-07-29, 00:00 authored by Xian Jian, Guozhang Chen, Hongyang Liu, Nasir Mahmood, Shibu Zhu, Liangjun Yin, Hui Tang, Weiqiang Lv, Weidong He, Kelvin H. L. Zhang, Qun Zeng, Baihai Li, Xuesong Li, Wanli Zhang, Xiaolin WangTwo-dimensional
graphene is easy to aggregate and hard to transfer
because of the van der Waals forces between graphene layers. The three-dimensional
(3D) graphite-like capsules (GCs) disperse well and exhibit robust
structural stability and have a potential for promising applications
in energy storage, drug delivery, catalyst substrate, etc. Here, we
develop a catalytic chemical vapor deposition route for the synthesis
of 3D GCs with unprecedented thickness and morphology control. The
theoretical results indicate that the strong chemisorption and charge
transfer between ZnO and acetylene allow the layer-by-layer formation
of GCs that is later confirmed by the experimental data. The 3D GCs
are synthesized with thickness control from three atomic layers to
∼300 atomic layers over various oxides with predesigned shapes
of microscale tetrapods, nanospheres, nanorods, nanocubes, etc. In
particular, the formation mechanism of GCs is investigated using the
ZnO surface as a catalyst through systematically experimental approaches.
In addition to the high-quality of 3D GCs, this approach provides
an unprecedented facile methodological control of coating/functionalizing
carbon over various oxides including ZnO, TiO2, SnO2, BaFe12O19, etc.
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Keywords
van der Waals forcesmorphology controlcharge transferpredesigned shapesAtomic-level Thickness Control Two-dimensional graphenecatalyst substrateDelicate Morphologychemical vapor deposition routeSnO 2layer-by-layer formationBaFe 12 O 19ZnO surfaceenergy storagethickness controlmicroscale tetrapods3 D GCsgraphite-like capsulesformation mechanismTiO 2drug deliveryThree-Dimensional Graphite-like Capsulesgraphene layers
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