Bonding method of fixing an object to a rough surface

A bonding method comprising:

• placing a sheet structure on a substrate surface of a substrate, wherein a surface roughness of the substrate surface is larger than 1.0 micrometer;
• the sheet structure comprises a first surface and a second surface opposite to the first surface, the first surface is in direct contact with the substrate surface, and a surface roughness of the second surface is less than or equal to 1.0 micrometer;
• laying a carbon nanotube structure on the second surface, wherein the carbon nanotube structure comprises a first portion, a second portion, and a third portion, the first portion and the second portion are connected together by the third portion, the first portion and the second portion extend out of the second surface and are in direct contact with the substrate surface, the third portion is in direct contact with the sheet structure;
• the carbon nanotube structure comprises a super-aligned carbon nanotube film, the super-aligned carbon nanotube film comprises a plurality of carbon nanotubes, the plurality of carbon nanotubes extends substantially along a same direction, and an extending direction of the plurality of carbon nanotubes is substantially parallel to the second surface;
• adding an organic solvent to the first portion and the second portion, to fix the sheet structure on the substrate surface only by the carbon nanotube structure;
• laying an object on and in direct contact with the third portion, wherein the carbon nanotube structure is located between the sheet structure and the object, and a surface of the object being in direct contact with the third portion has a surface roughness less than or equal to 1.0 micrometer;
• and
• applying a pressure to the object to make the object bonded to the substrate surface and forming a structure comprising the substrate, the sheet structure, the carbon nanotube structure and the object.