Infrared Radiation of Graphene Electrothermal Film Triggered Alpha and Theta Brainwaves

Abstract

As a 2D material, graphene has significant advantages with unique electronic, optical, thermal, and mechanical properties, [1][2][3] such as excellent carrier mobility, strong electronelectron interaction, and ultrahigh thermal conductivity. [4][5][6] Recently, thermal infrared emission in carbon materials, especially the graphene, has been explored, [7,8] which is attributed to the strong in-plane vibrational transitions of carbon atoms. [9,10] While applying a bias voltage through the graphene film, most of the electronic energy can be transformed into infrared radiation, apart from Joule heat dissipated into the substrate contacted. [11,12] Infrared radiation is an invisible electromagnetic wave with a longer wavelength than visible light, which can be further subdivided into three different wavelengths: near-infrared (0.8-1.5 μm), mid-infrared (1.5-5.6 μm), and far-infrared (5.6-1000 μm) radiation. [13] While passing a current through the graphene, mid-infrared and farinfrared rays (4-20 μm) are radiated into free space. [14] Recently, we have demonstrated the fabrication of large-scale multilayer graphene and patented it as the multilayer graphene film with a high far-infrared emissivity over 90%, [15] which can penetrate 2-3 mm into human skin. [16] Especially, the infrared radiation of graphene is matching with the human radiation wavelength (7-14 μm), [17] which can substantially exert strong rotational and vibrational effects with humans at the molecular level. [18] So the graphene infrared technique can be used in medical treatment and daily life, which can improve human health or heat preservation. [19,20] Recently, LED lights flashing at a specific 40 Hz frequency were found to significantly reduce amyloid beta plaques in the visual cortex of Alzheimer's disease mice, [21] inducing gamma oscillations that help the brain in suppressing amyloid beta production and activating cells that destroy plaques. [22,23]