Soft Lithography Xia, Y.; Whitesides, G. M.

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Presentation transcript:

Soft Lithography Xia, Y.; Whitesides, G. M. Angew. Chem. Int. Ed. 1998, 37, 550-575.

Soft Lithography A group of non-lithographic techniques for micro- and nano-fabrication using a soft elastomeric stamp. poly(dimethylsiloxane)

Stamp replication process

Microcontact printing (CP)

SAMIM- solvent assisted microcontact molding RM- replica molding SAMIM- solvent assisted microcontact molding Micromolding in Capillaries (MIMIC). Continuous channels are formed when a PDMS stamp is brought into conformal contact with a solid substrate. Capillary action fills the channels with a polymer precursor. The polymer is cured and the stamp is removed. MIMIC is able to generate features down to 1 µm in size (Kim, Xia and Whitesides 1995; Xia, Kim, and Whitesides 1996). Microtransfer Molding ((TM). A PDMS stamp is filled with a prepolymer or ceramic precursor and placed on a substrate. The material is cured and the stamp is removed. The technique generates features as small as 250 nm and is able to generate multilayer systems (Zhao, Xia, and Whitesides 1996). Solvent-assisted Microcontact Molding (SAMIM). A small amount of solvent is spread on a patterned PDMS stamp and the stamp is placed on a polymer, such as photoresist. The solvent swells the polymer and causes it to expand to fill the surface relief of the stamp. Features as small as 60 nm have been produced (Kim et al. n.d.). Microcontact Printing ((CP). An "ink" of alkanethiols is spread on a patterned PDMS stamp. The stamp is then brought into contact with the substrate, which can range from coinage metals to oxide layers. The thiol ink is transferred to the substrate where it forms a self-assembled monolayer that can act as a resist against etching. Features as small as 300 nm have been made in this way (Kumar and Whitesides 1993).

µTM – microtransfer molding MIMIC –micromolding in capillaries