Surface modification using automatic, transportable, single-wavelength UV treatment system for formation of surfaces with high adhesion

Multi-material structures have become increasingly prevalent in recent years, particularly in the automotive and optical device industries. Achieving a strong bond between different materials in these structures is essential, and surface modification is a key step in achieving this bond. Common surface treatment methods include plasma, flame, blasting, and light treatment, but these high-energy methods can sometimes damage the substrate, which is especially problematic in the case of optical devices. Therefore, there is a need for milder surface treatment methods. To address this issue, researchers have developed a custom-made ultraviolet (UV) surface treatment system with an automatic transporter. They investigated the effects of surface modification on indium tin oxide/glass substrates and found that after ∼5 min of treatment with their system, the water contact angle (which is required for coating processes) was reduced, indicating successful surface modification. This was confirmed by narrow-scan x-ray photoelectron spectroscopy measurements, which showed a decay of the C1s peak. The developed UV treatment method is expected to be a useful surface treatment option for adherends in various multi-material structures, particularly those in the optical device industry where substrate damage must be avoided.