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Cataldi, P., Athanassiou, A., & Bayer, I. S. (2018). Applied Sciences, 8(9), 1438.
Graphene nanoplatelets (GnPs), a hybrid of graphene and graphite, are already industrially available. Such nanomaterials are attractive given their planar structure, light weight, high aspect ratio, electrical conductivity, low cost, and mechanical toughness. These diverse functionalities enable applications ranging from energy harvesting and electronic skin to reinforced plastic materials.
Applications of Graphene Nanoplatelets-Based Advanced Materials
· Flexible electronics based on GnPs
Graphene nanoplatelets are gaining more and more attention as materials for flexible electronic devices due to their flexibility and low sheet resistance. A flexible, lightweight, free-standing graphene nanosheet paper was prepared with an electrical conductivity of σ≈2×106 S/m. This adhesive-free porous film was bent without breaking.
· Wearable electronics based on GnPs
Industrially produced fabrics are rendered conductive by functionalization based on GnPs. This approach has the advantage of being applicable to several commercially available materials, such as cotton and polyester, and due to the fact that GnPs are already produced in quantities (hundreds of tons) suitable for the textile market.
· GnPs for strain sensors and stretchable electronics
Different approaches are used to realize strain sensors based on GnPs. The most commonly used feedback mechanism is based on the change in resistance (piezoresistivity) caused by stretching. The strain gauge was designed by simply spraying a pristine GnPs film on a plastic PET substrate.
Kumar, D., Singh, K., Verma, V. et al. Appl Nanosci 6, 97-103 (2016).
Graphene, one of the allotropes of the element carbon, has a planar single layer of carbon atoms arranged in a two-dimensional honeycomb lattice. As a new material for future applications and composites industry, it has demonstrated various interesting properties. In particular, interesting electrical properties make graphene an excellent successor to silicon in electronic applications. Due to their rather difficult and complex preparation, graphene nanoplatelets (GNPs) have also been intensively studied because GNPs are more readily available, have similar properties, and can be used in the same applications.
Synthesis of GNPs
a. Expandable graphite powder is heated by microwave radiation for 3 minutes, which exhibits the most significant volume expansion, resulting in the lightest and fluffiest powder.
b. For further exfoliation, soak 0.1g of this substance in 100ml of concentrated mixed acid [V(H2SO4):V(HNO3)=1:1] for 24 hours, then wash with deionized water until the solution penetrates Become neutral.
c. Carry out vacuum filtration and dry the gray filter cake in an electric furnace at 60°C. After soaking in mixed acid, treat with second microwave radiation for 3 minutes.
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