Method for measuring bonding force between substrate and carbon nanotube array formed thereon

A method for measuring a bonding force between a substrate and a carbon nanotube array formed thereon, the carbon nanotube array comprising a plurality of carbon nanotubes, the method comprising the following steps:

• providing a force gauge including a cantilever, a probe, a movement mechanism and a force sensor, the probe being secured at one end of the cantilever and having a flat surface;
• forming an adhesive layer on the flat surface of the probe;
• bringing the probe toward the substrate and into proximity of the carbon nanotube array by the movement mechanism, causing the adhesive layer on the flat surface to contact the carbon nanotubes and thereby adhere to the probe;
• pulling the probe away from the substrate by the movement mechanism, causing the carbon nanotubes adhered to the probe to separate from the substrate;
• and
• obtaining a value of the bonding force between the carbon nanotube array and the substrate by calculating a relationship between a number of the carbon nanotubes adhered to the adhesive layer and a force value detected by the force sensor.