▎ 摘　　要

NOVELTY - Making a thermoacoustic element involves: arranging a graphene film (106) on a metal substrate (100); forming a laminate structure by stacking a nonmetal substrate (200) on the metal substrate, where the graphene film is sandwiched between the nonmetal substrate and the metal substrate; removing the metal substrate from the laminate structure; and forming several through-holes (206) in the nonmetal substrate, where the graphene film is exposed through the through-holes. USE - For making a thermoacoustic element (claimed) which is used for acoustic devices such as signal device and a sound wave generator e.g. loudspeaker. ADVANTAGE - The method provides thermoacoustic element having high acoustic efficiency, good acoustic effect and improved sound intensity. The thermoacoustic element obtained by the present method has no magnet, thus, the structure of the thermoacoustic element is simple, thereby decreasing cost of the thermoacoustic element. DETAILED DESCRIPTION - Making a thermoacoustic element involves: arranging a graphene film (106) on a metal substrate (100); forming a laminate structure by stacking a nonmetal substrate (200) on the metal substrate, where the graphene film is sandwiched between the nonmetal substrate and the metal substrate; removing the metal substrate from the laminate structure; and forming several through-holes (206) in the nonmetal substrate, where the graphene film is exposed through the through-holes. The method further involves: fixing the nonmetal substrate and the graphene film together, where the fixing step comprises disposing a macromolecule solution or a molten macromolecule between the graphene film and nonmetal substrate, and solidifying the macromolecule solution or molten macromolecule to form a macromolecule material layer, and where the graphene film and nonmetal substrate are fixed together by the macromolecule material layer; and combining a carbon nanotube layer with the graphene film, where the carbon nanotube layer comprises drawn carbon nanotube film, flocculated carbon nanotube film and/or pressed carbon nanotube film. DESCRIPTION OF DRAWING(S) - The figure shows a flowchart of a method for making a thermoacoustic element at various stages. Metal substrate (100) First surface (102) Second surface (104) Graphene film (106) Nonmetal substrate (200) Through-holes (206)