Abstract: A method for surface-modifying a sensor device is disclosed, which includes the following steps: providing a sensor device, wherein a surface of the sensor device has a metal film; forming a surface-modification layer having a plurality of carboxyl groups on the metal film of the sensor device by isopropyl alcohol plasma; and forming a poly(acrylic acid) layer on the surface-modification layer, wherein the acrylic acid of the poly(acrylic acid) layer is grafted to the carboxyl of the surface-modification layer. A surface-modified sensor device is also disclosed.

Abstract: A method for improving an optical sensor is disclosed, which includes the following steps: providing an optical sensor; acid-treating the surface of the optical sensor; forming a thin metal film on the acid-treated surface of the optical sensor; and plasma-modifying the thin metal film on the optical sensor. The aforesaid method is to clean the surface of the optical sensor and then to improve the hydrophilicity thereof by acid treatment. The thin metal film subsequently formed has good flatness and improved adhesion to the optical sensor. Once the optical sensor has the improved hydrophilicity, the plasma modification is performed to further improve optical performance of the optical sensor.