Browsing by Author "Chen, Shuyang"

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    'Data sheet of nanocomposites with F/N-doped ZnO'
    (Cranfield University, 2024-02-20 13:07) Chen, Shuyang; Skordos, Alex; Kumar Thakur, Vijay
    The dataset for this research comprises the measurement results for pristine PVDF and PVDF-ZnO nanocomposites with and without fluorine/nitrogen doping. For TGA, DSC and XRD results each file contains the relevant data per experimental technique. Within each file worksheets correspond to the different materials. The column headers specify the variables and their associated units. For dielectric tests, the data is organised in separate files for permittivity, loss and imaginary modulus. The data are organised in worksheets by material in 2D arrays. The rows correspond to spectra at different measured temperatures and the columns to fixed frequency data. The materials nomenclature is as follows: -PVDF: pure PVDF -PVDF+5% ZnO: PVDF with 5% ZnO by weight -PVDF+10% ZnO: PVDF with 10% ZnO by weight -PVDF+15% ZnO: PVDF with 15% ZnO by weight -PVDF+5% F-ZnO: PVDF with 5% Fluorine doped (10% molar fraction) ZnO by weight -PVDF+10% F-ZnO: PVDF with 10% Fluorine doped (10% molar fraction) ZnO by weight -PVDF+15% F-ZnO: PVDF with 15% Fluorine doped (10% molar fraction) ZnO by weight -PVDF+5% N-ZnO: PVDF with 5% Nitrogen doped (10% molar fraction) ZnO by weight-PVDF+10% N-ZnO: PVDF with 10% Nitrogen doped (10% molar fraction) ZnO by weight -PVDF+15% N-ZnO: PVDF with 15% Nitrogen doped (10% molar fraction) ZnO by weight
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    Fluorine and nitrogen doping of zinc oxide to enhance dielectric storage of PVDF based particulate composites
    (Elsevier, 2024-02-20) Chen, Shuyang; Thakur, Vijay Kumar; Skordos, Alexandros A.
    Polyvinylidene fluoride (PVDF) based polymer nanocomposites with ceramics as nanofiller have been investigated as a solution for energy storage devices due to their unique and attractive combination of processability and electrical properties. This work assesses two dopants (fluorine and nitrogen) for zinc oxide (ZnO) nanoparticles PVDF matrix composites as a means of improving dielectric properties targeting capacitive storage. Fluorine doping achieves improved performance compared to pure ZnO nanocomposites increasing the decomposition temperature by 15 °C to 463 °C with 15 wt% F-doped ZnO and reducing the weight loss by 4.2 %. The highest dielectric constant that can be achieved with the addition of fluorine is about 70 at room temperature, which is more than 3 times greater than that of pure ZnO nanocomposite. Nitrogen doping also enhances the permittivity of the nanocomposites at ambient temperature but limit enhancement at high temperature due to the lower activation energy.
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    Functional nanocomposites for energy storage: chemistry and new horizons
    (Elsevier, 2020-08-13) Chen, Shuyang; Skordos, Alexandros A.; Thakur, Vijay Kumar
    Energy storage devices are one of the hot spots in recent years due to the environmental problems caused by the large consumption of unsustainable energy such as petroleum or coal. Capacitors are a common device for energy storage, especially electrical energy. A variety of types including electrolytic capacitors, mica capacitors, paper capacitors, ceramic capacitors, film capacitors, and non-polarized capacitors have been proposed. Their specific applications depend on their intrinsic properties. Dielectric capacitors have reasonable energy storage density, with current research focusing on the enhancement of energy density and making the materials more flexible as well as lightweight. Improvement strategies are based on the premise that use of two or more different materials (e.g. polymers and ceramics/metals) at an optimal formulation can result in properties that combine the advantages of the precursor materials. Different polymers especially fluoropolymers (e.g. PVDF and PVDF based co-polymer) are the main components in dielectric nanocomposites for capacitors with high energy storage performance. In this article, we have briefly summarized the recent advances in functional polymers nanocomposites for energy storage applications with a primary focus on polymers, surface engineering, functional groups and novel synthesis/manufacturing concepts applied to new materials. The article presents a unique integrated structure and approaches providing key knowledge for the design and development of novel, low-cost, multifunctional next-generation energy storage materials with improved efficiency.