Surface modification of Sylgard 184 polydimethylsiloxane by 254 nm excimer radiation and characterization by contact angle goniometry, infrared spectroscopy, atomic force and scanning electron microscopy

• Published in: Applied surface science Vol. 254; no. 17; pp. 5314 - 5318
• Main Authors: Waddell, Emanuel A., Shreeves, Stephen, Carrell, Holly, Perry, Christopher, Reid, Branden A., McKee, James
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.06.2008; Elsevier Science
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Contact angle; Cross-disciplinary physics: materials science; rheology; Electron and ion emission by liquids and solids; impact phenomena; Exact sciences and technology; Excimer; Impact phenomena (including electron spectra and sputtering); Laser-beam impact phenomena; Materials science; Microscopy; Organic polymers; Physicochemistry of polymers; Physics; Polydimethylsiloxane; Properties and characterization; Surface modification; Surface properties; Surface treatments; Wettability; 81.05.Lg; Surface modification; Wettability; Microscopy; Excimer; Contact angle; 81.65.−b; Polydimethylsiloxane; Dimethylsiloxane polymer; Scanning electron microscopy; Reflection spectrum; Goniometry; Surface treatments; Infrared spectra; Surface cracks; 81.05.Lg;81.65.-b;Polydimethylsiloxane;Surface modification;Excimer;Contact angle;Wettability;Microscopy
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2008.02.087

The modification of polydimethylsiloxane (PDMS) by narrow band 254 nm excimer radiation under a nitrogen atmosphere was characterized by contact angle goniometry, attenuated total reflectance infrared spectroscopy, atomic force and scanning electron microscopy. UV irradiation results in the formation of the carboxylic acids that influences the wettability of the surface. Continued exposure results in the formation of an inorganic surface (SiO x (1 < x < 2)) which hinders the ability to continually increase the wettability. The continuity of this inorganic layer is disrupted by the formation of surface cracks. These results have implications in the fabrication and chemical modification of microfluidic or micro-electro-mechanical systems.