Mechanical rolling of nickel nanowire-PVDF composites yields enhanced conductivity and electromagnetic shielding properties
Highly flexible and lightweight PVDF-based nickel nanowires (NiNWs) composites are promising candidates for electronic devices, particularly in electromagnetic shielding. However, the alignment of NiNWs within the PVDF matrix to achieve high electrical conductivity presents a significant challenge....
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Elsevier
2025-09-01
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| Series: | Results in Engineering |
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| author | Meghana Jois H S Amanuel Gebrekrstos Anastasia Elias |
| author_facet | Meghana Jois H S Amanuel Gebrekrstos Anastasia Elias |
| author_sort | Meghana Jois H S |
| collection | DOAJ |
| description | Highly flexible and lightweight PVDF-based nickel nanowires (NiNWs) composites are promising candidates for electronic devices, particularly in electromagnetic shielding. However, the alignment of NiNWs within the PVDF matrix to achieve high electrical conductivity presents a significant challenge. In this study, we present a straightforward and scalable method to prepare aligned NiNWs-PVDF composites using mechanical shear force (i.e., rolling). We firstly synthesized conductive, high aspect ratio NiNWs; we then prepared thin films of PVDF/NiNWs composites with various NiNWs concentrations (40–70 wt.%) via solution casting. These solution-cast PVDF/NiNWs composites were then mechanically rolled, and alignment of the NiNWs and PVDF lamellae was achieved, as confirmed by TEM and SAXS images. The oriented NiNWs in the PVDF matrix exhibited superior electrical conductivity compared to solution-cast samples without mechanical rolling. Notably, the percolation threshold of the rolled films was lower than that of the samples that were not rolled. Furthermore, the rolling process increased both the β-phase formation and the overall crystallinity of the PVDF matrix, as evidenced by FTIR and DSC analyses, respectively. Owing to enhancement of conductivity and dielectric permittivity, rolled composites displayed a total shielding efficiency of -42 dB over the 12 – 18 GHz frequency band (relevant to satellite and microwave communications), compared with -32 dB for non-rolled (solution cast) samples. This performance can be attributed to an absorption-dominant shielding mechanism due to the enhancement of interfacial polarization and β-phase formation. Mechanically rolled films are good candidates for use in EMI shielding applications requiring thin and lightweight materials. |
| format | Article |
| id | doaj-art-e5e25e00bd994eb69a6c02e1624eac13 |
| institution | Kabale University |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
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| series | Results in Engineering |
| spelling | doaj-art-e5e25e00bd994eb69a6c02e1624eac132025-08-22T04:57:23ZengElsevierResults in Engineering2590-12302025-09-012710669910.1016/j.rineng.2025.106699Mechanical rolling of nickel nanowire-PVDF composites yields enhanced conductivity and electromagnetic shielding propertiesMeghana Jois H S0Amanuel Gebrekrstos1Anastasia Elias2Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9 CanadaDepartment of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9 CanadaCorresponding author.; Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9 CanadaHighly flexible and lightweight PVDF-based nickel nanowires (NiNWs) composites are promising candidates for electronic devices, particularly in electromagnetic shielding. However, the alignment of NiNWs within the PVDF matrix to achieve high electrical conductivity presents a significant challenge. In this study, we present a straightforward and scalable method to prepare aligned NiNWs-PVDF composites using mechanical shear force (i.e., rolling). We firstly synthesized conductive, high aspect ratio NiNWs; we then prepared thin films of PVDF/NiNWs composites with various NiNWs concentrations (40–70 wt.%) via solution casting. These solution-cast PVDF/NiNWs composites were then mechanically rolled, and alignment of the NiNWs and PVDF lamellae was achieved, as confirmed by TEM and SAXS images. The oriented NiNWs in the PVDF matrix exhibited superior electrical conductivity compared to solution-cast samples without mechanical rolling. Notably, the percolation threshold of the rolled films was lower than that of the samples that were not rolled. Furthermore, the rolling process increased both the β-phase formation and the overall crystallinity of the PVDF matrix, as evidenced by FTIR and DSC analyses, respectively. Owing to enhancement of conductivity and dielectric permittivity, rolled composites displayed a total shielding efficiency of -42 dB over the 12 – 18 GHz frequency band (relevant to satellite and microwave communications), compared with -32 dB for non-rolled (solution cast) samples. This performance can be attributed to an absorption-dominant shielding mechanism due to the enhancement of interfacial polarization and β-phase formation. Mechanically rolled films are good candidates for use in EMI shielding applications requiring thin and lightweight materials.http://www.sciencedirect.com/science/article/pii/S2590123025027665PVDF/NiNWs compositesAlignmentMechanical rollingElectrical conductivityβ-phaseEMI shielding application |
| spellingShingle | Meghana Jois H S Amanuel Gebrekrstos Anastasia Elias Mechanical rolling of nickel nanowire-PVDF composites yields enhanced conductivity and electromagnetic shielding properties Results in Engineering PVDF/NiNWs composites Alignment Mechanical rolling Electrical conductivity β-phase EMI shielding application |
| title | Mechanical rolling of nickel nanowire-PVDF composites yields enhanced conductivity and electromagnetic shielding properties |
| title_full | Mechanical rolling of nickel nanowire-PVDF composites yields enhanced conductivity and electromagnetic shielding properties |
| title_fullStr | Mechanical rolling of nickel nanowire-PVDF composites yields enhanced conductivity and electromagnetic shielding properties |
| title_full_unstemmed | Mechanical rolling of nickel nanowire-PVDF composites yields enhanced conductivity and electromagnetic shielding properties |
| title_short | Mechanical rolling of nickel nanowire-PVDF composites yields enhanced conductivity and electromagnetic shielding properties |
| title_sort | mechanical rolling of nickel nanowire pvdf composites yields enhanced conductivity and electromagnetic shielding properties |
| topic | PVDF/NiNWs composites Alignment Mechanical rolling Electrical conductivity β-phase EMI shielding application |
| url | http://www.sciencedirect.com/science/article/pii/S2590123025027665 |
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