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Abstract

Highly microporous laser fabricated three-dimensional graphene which can be prepared from a fluorinated polyimide is disclosed. The three-dimensional porous graphene may have a multi-scale structure, which enables optimum photodetection, particularly across the visible wavelengths, and other improved optical properties. In some aspects, the porous graphene has the following pore structure: macropores having an average pore size exceeding 50 nm; mesopores having an average pore size of 2-50 nm; micropores having an average pore size of 2 nm or less; and nanopores having an average pore size of less than 100 nm. A broadband, high-sensitivity photodetector based on three-dimensional (3D) porous graphene is also disclosed. The 3D porous graphene may be derived from a fluorinated polyimide, via for example a laser photothermal method. The porous graphene exhibits an ultrahigh specific surface area, facilitating optical-absorption properties, such as light-absorbing area and optical resonance.

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First Claim