Surface modification with self-assembled monolayers for nanoscale replication of photoplastic MEMS

• Published in: Journal of microelectromechanical systems Vol. 11; no. 3; pp. 175 - 181
• Main Authors: Gyu Man Kim, Beomjoon Kim, Liebau, M., Huskens, J., Reinhoudt, D.N., Brugger, J.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-06-2002; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adhesives; Aluminum; Applied sciences; Chemistry; Coatings; Electrodes; Etching; Exact sciences and technology; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Mechanical engineering. Machine design; Mechanical instruments, equipment and techniques; Microelectromechanical systems; Micromechanical devices and systems; Molding; Nanocomposites; Nanomaterials; Nanostructure; Nanotechnology; Physics; Plastics; Precision engineering, watch making; Replication; Self assembly; Self-assembled monolayers; Semiconductors; Silica; Silicon compounds; Soft lithography; Surface treatment; Thick films; Thin films; Self assembly; Monolayer; Mould release; Lift off; Precision engineering; Replication; Nanostructure; Miniaturization; Microelectromechanical device
• ISSN: 1057-7157; 1941-0158
• DOI: 10.1109/JMEMS.2002.1007395

A release technique that enables to lift microfabricated structures mechanically off the surface without using wet chemistry is presented. A self-assembled monolayer of dodecyl-trichlorosilane forms a very uniform /spl sim/1.5-nm-thick anti-adhesion coating on the silicon dioxide surface, on full wafer scale. The structural layers are formed directly onto the organic layer. They consist here of a 100-nm-thick aluminum film and a high-aspect ratio photoplastic SU-8 structure. After the microfabrication the structure can be lifted off the surface together with the aluminum layer. This generic technique was used to make a variety of novel structures. First, aluminum electrodes that are embedded in plastic are made using lithography, etching and surface transfer techniques. Second, using a patterned monolayer as defined by microcontact printing, resulted in a spatial variation of the surface adhesion forces. This was used to directly transfer the stamped pattern into a metal structure without using additional transfer etching steps. Third, the monolayer's ability to cover surface features down to nanometer scale was exploited to replicate sharp surface molds into metal coated photoplastic tips with /spl sim/30-nm radii for use in scanning probe instruments such as near-field optical techniques. The advantage compared to standard sacrificial layer techniques is the ability of replication at the nanoscale and the absence of etchants or solvents in the final process steps.