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  • Polymer derived silicon oxycarbide-based coatings
    Int. Mater. Rev. (IF 8.605) Pub Date : 2017-05-18
    Kathy Lu, Donald Erb

    Silicon oxycarbide (SiOC) is a promising protective coating material. However, so far there has not been any comprehensive review to systematically evaluate the characteristics and properties of this material as coatings. In this review, SiOC compositions and fillers are examined based on their fundamental functions in the coating materials. From a processing point of view, different coating formation processes, such as plasma-enhanced chemical vapour deposition, dip coating, and spin coating, are discussed. As an intrinsic requirement and one of the most challenging aspects for SiOC to be used as coating materials, the stability of SiOC in air conditions is analysed and the degradation mechanisms of SiOC are discussed. Lastly, for different application needs, the physical and mechanical behaviours, electrical conductivity, and optical property of the coatings are presented. This first-ever systematic review on the SiOC system as coating materials is intended to provide guidance for future SiOC coating development.

    更新日期:2018-01-11
  • Progress in CVD synthesis of layered hexagonal boron nitride with tunable properties and their applications
    Int. Mater. Rev. (IF 8.605) Pub Date : 2017-05-15
    Malay Jana, Raj N. Singh

    A very thin layer of hexagonal boron nitride (h-BN) is an important 2D nanomaterial, sometimes called ‘white graphene’, with many properties distinct from graphene. However, the lack of controlled synthesis of high quality and wide-area films largely prevents realisation of the full potential of this material. In this review article, a comprehensive overview of the current status of the synthesis, growth mechanism using chemical vapour deposition, structure and electronic properties to tune the bandgap is covered. In particular, the progress towards achieving the improved quality and functionalities of the h-BN films via epitaxial growth and control of grain size, number of layers, morphology and orientation have been critically reviewed. In addition to synthesis and properties of the atomically thin (mono and few layer) h-BN, the applications in possible and emerging areas are also described and discussed.

    更新日期:2018-01-11
  • Three-dimensional graphene monolith-based composite: superiority in properties and applications
    Int. Mater. Rev. (IF 8.605) Pub Date : 2017-07-05
    Bo Tang, Shuli Wang, Jun Zhang, Zhengwei Wang, Yanfeng He, Weiqiu Huang

    With the development of graphene research, the three-dimensional graphene monolith (3DGM), which can be prepared by the chemical vapour deposition method (CVD-3DGM) and the self-assembly of reduced graphene oxide nanosheets (RGO-3DGM), has drawn increasing attention because of its properties and application prospects that are better than those of two-dimensional graphene nanosheets. By utilising its excellent electrical property, large BET area and favourable mechanical strength, some research findings on the 3DGM-assisted thermal interface materials, conductive polymers and films, dye-sensitised solar cells and supercapacitors have been reported. In this perspective, we review recent progress in the synthesis and application of 3DGM-based composites and devices. In particular, the advantages of the CVD-3DGM are highlighted after comparing the reports, and the specific reasons are analysed and discussed. Finally, the probable directions of development, research focus and corresponding challenges for the preparation and application of the CVD-3DGM in the future are proposed.

    更新日期:2018-01-11
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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