Ultra-high conductive graphene assembled film for millimeter wave electromagnetic protection

A 3D Printing Strategy for Hard Curved Surfaced Circuits: From Materials to Applications

“…[ 192 ] In the field of environmental sensing, 3D‐printed frequency‐selective surfaces can dynamically modulate the reflection phase of electromagnetic waves and reduce the radar scattering cross‐section. [ 193 , 194 ] This technology not only retains the high‐performance characteristics of planar integrated circuits but also significantly improves the mechanical stability and electromagnetic reliability of devices in extreme service environments. [ 195 , 196 , 197 ] Currently, additive manufacturing techniques are widely used in smart wearable devices, curved conformal antennas, and smart skins for aircraft, [ 181 , 198 , 199 , 200 , 201 , 202 , 203 , 204 , 205 , 206 , 207 ] and these techniques are expanding to more fields such as automotive electronics, biomedical, and energy systems.…”

A 3D Printing Strategy for Hard Curved Surfaced Circuits: From Materials to Applications

“…[ 192 ] In the field of environmental sensing, 3D‐printed frequency‐selective surfaces can dynamically modulate the reflection phase of electromagnetic waves and reduce the radar scattering cross‐section. [ 193 , 194 ] This technology not only retains the high‐performance characteristics of planar integrated circuits but also significantly improves the mechanical stability and electromagnetic reliability of devices in extreme service environments. [ 195 , 196 , 197 ] Currently, additive manufacturing techniques are widely used in smart wearable devices, curved conformal antennas, and smart skins for aircraft, [ 181 , 198 , 199 , 200 , 201 , 202 , 203 , 204 , 205 , 206 , 207 ] and these techniques are expanding to more fields such as automotive electronics, biomedical, and energy systems.…”

An anisotropic broadband coding metasurface based on ultralight graphene‐assembled film

“…The GAF used in this work was produced by applying a secondary high-temperature annealing to improve the conductivity: step1, preparing graphene oxide suspension; step2, roll-coating onto a polyethylene terephthalate; step3, evaporation drying; step4, thermally annealing in Ar atmosphere; step5, rolling and compressing; step6, annealing again under Ar atmosphere; step7, rolling at a pressure of 200 MPa. 29 The GAF with high conductivity of 1.1 × 10 6 S/m is used as the conductive material of the structural layer and the reflective layer. The polymethacrylimide (PMI) foam with a density of 0.05 g/cm 3 and a dielectric constant of 1.05 serves as the dielectric substrate material.…”

“…The metasurface units comprise three layers, including the structural layer, the dielectric layer, and the reflective layer. The GAF used in this work was produced by applying a secondary high‐temperature annealing to improve the conductivity: step1, preparing graphene oxide suspension; step2, roll‐coating onto a polyethylene terephthalate; step3, evaporation drying; step4, thermally annealing in Ar atmosphere; step5, rolling and compressing; step6, annealing again under Ar atmosphere; step7, rolling at a pressure of 200 MPa 29 . The GAF with high conductivity of 1.1 × 10 6 S/m is used as the conductive material of the structural layer and the reflective layer.…”

Graphene assembled film based conformal sensor array for submillimeter crack location and direction detection

“…Graphene based films have excellent electrical conductivity and corrosion resistance, and show good electrical stability under mechanical deformation. [14][15][16][17] Graphene assembled film (GAF) has been widely used in wearable antennae, communication antennae, pressure sensors, and other RF devices. [18][19][20] Meanwhile, in our previous work, a GAF-based conformal rectangular patch antenna sensor was proposed to detect cracks on curved metal surfaces with a sensitivity of 36.82 MHz mm −1 , which is sufficient for millimeter cracks.…”

A 3D Printing Strategy for Hard Curved Surfaced Circuits: From Materials to Applications

“…[ 192 ] In the field of environmental sensing, 3D‐printed frequency‐selective surfaces can dynamically modulate the reflection phase of electromagnetic waves and reduce the radar scattering cross‐section. [ 193 , 194 ] This technology not only retains the high‐performance characteristics of planar integrated circuits but also significantly improves the mechanical stability and electromagnetic reliability of devices in extreme service environments. [ 195 , 196 , 197 ] Currently, additive manufacturing techniques are widely used in smart wearable devices, curved conformal antennas, and smart skins for aircraft, [ 181 , 198 , 199 , 200 , 201 , 202 , 203 , 204 , 205 , 206 , 207 ] and these techniques are expanding to more fields such as automotive electronics, biomedical, and energy systems.…”

An anisotropic broadband coding metasurface based on ultralight graphene‐assembled film

“…The GAF used in this work was produced by applying a secondary high-temperature annealing to improve the conductivity: step1, preparing graphene oxide suspension; step2, roll-coating onto a polyethylene terephthalate; step3, evaporation drying; step4, thermally annealing in Ar atmosphere; step5, rolling and compressing; step6, annealing again under Ar atmosphere; step7, rolling at a pressure of 200 MPa. 29 The GAF with high conductivity of 1.1 × 10 6 S/m is used as the conductive material of the structural layer and the reflective layer. The polymethacrylimide (PMI) foam with a density of 0.05 g/cm 3 and a dielectric constant of 1.05 serves as the dielectric substrate material.…”

“…The metasurface units comprise three layers, including the structural layer, the dielectric layer, and the reflective layer. The GAF used in this work was produced by applying a secondary high‐temperature annealing to improve the conductivity: step1, preparing graphene oxide suspension; step2, roll‐coating onto a polyethylene terephthalate; step3, evaporation drying; step4, thermally annealing in Ar atmosphere; step5, rolling and compressing; step6, annealing again under Ar atmosphere; step7, rolling at a pressure of 200 MPa 29 . The GAF with high conductivity of 1.1 × 10 6 S/m is used as the conductive material of the structural layer and the reflective layer.…”

Graphene assembled film based conformal sensor array for submillimeter crack location and direction detection

“…Graphene based films have excellent electrical conductivity and corrosion resistance, and show good electrical stability under mechanical deformation. [14][15][16][17] Graphene assembled film (GAF) has been widely used in wearable antennae, communication antennae, pressure sensors, and other RF devices. [18][19][20] Meanwhile, in our previous work, a GAF-based conformal rectangular patch antenna sensor was proposed to detect cracks on curved metal surfaces with a sensitivity of 36.82 MHz mm −1 , which is sufficient for millimeter cracks.…”

A 3D Printing Strategy for Hard Curved Surfaced Circuits: From Materials to Applications

“…[ 192 ] In the field of environmental sensing, 3D‐printed frequency‐selective surfaces can dynamically modulate the reflection phase of electromagnetic waves and reduce the radar scattering cross‐section. [ 193 , 194 ] This technology not only retains the high‐performance characteristics of planar integrated circuits but also significantly improves the mechanical stability and electromagnetic reliability of devices in extreme service environments. [ 195 , 196 , 197 ] Currently, additive manufacturing techniques are widely used in smart wearable devices, curved conformal antennas, and smart skins for aircraft, [ 181 , 198 , 199 , 200 , 201 , 202 , 203 , 204 , 205 , 206 , 207 ] and these techniques are expanding to more fields such as automotive electronics, biomedical, and energy systems.…”

An anisotropic broadband coding metasurface based on ultralight graphene‐assembled film

“…The GAF used in this work was produced by applying a secondary high-temperature annealing to improve the conductivity: step1, preparing graphene oxide suspension; step2, roll-coating onto a polyethylene terephthalate; step3, evaporation drying; step4, thermally annealing in Ar atmosphere; step5, rolling and compressing; step6, annealing again under Ar atmosphere; step7, rolling at a pressure of 200 MPa. 29 The GAF with high conductivity of 1.1 × 10 6 S/m is used as the conductive material of the structural layer and the reflective layer. The polymethacrylimide (PMI) foam with a density of 0.05 g/cm 3 and a dielectric constant of 1.05 serves as the dielectric substrate material.…”

“…The metasurface units comprise three layers, including the structural layer, the dielectric layer, and the reflective layer. The GAF used in this work was produced by applying a secondary high‐temperature annealing to improve the conductivity: step1, preparing graphene oxide suspension; step2, roll‐coating onto a polyethylene terephthalate; step3, evaporation drying; step4, thermally annealing in Ar atmosphere; step5, rolling and compressing; step6, annealing again under Ar atmosphere; step7, rolling at a pressure of 200 MPa 29 . The GAF with high conductivity of 1.1 × 10 6 S/m is used as the conductive material of the structural layer and the reflective layer.…”

Graphene assembled film based conformal sensor array for submillimeter crack location and direction detection

“…Graphene based films have excellent electrical conductivity and corrosion resistance, and show good electrical stability under mechanical deformation. [14][15][16][17] Graphene assembled film (GAF) has been widely used in wearable antennae, communication antennae, pressure sensors, and other RF devices. [18][19][20] Meanwhile, in our previous work, a GAF-based conformal rectangular patch antenna sensor was proposed to detect cracks on curved metal surfaces with a sensitivity of 36.82 MHz mm −1 , which is sufficient for millimeter cracks.…”