The research team was able to fabricate a variety of high-resolution patterned features, and stamps were cleaned and reused many times with little feature deterioration. The remaining monolayer, they found, can act as a resist for etching exposed gold features. The backfilling of new molecules into the lifted-off areas enabled patterned protein capture, and sharp 40 nanometer chemical patterns were achieved.
Led by Anne Andrews and Paul Weiss, the UCLA team represents a collaboration among researchers from UCLA's California NanoSystems Institute, the Semel Institute for Neuroscience and Human Behavior at UCLA, and the departments of chemistry and biochemistry, materials science and engineering, and psychiatry and biobehavioral sciences.
Conventional nanolithographic patterning techniques, such as photolithography and electron-beam lithography, are expensive, time-consuming, require specialized equipment and instrumentation, and have limited capabilities for chemical patterning; here, they only need to be used for the fabrication of stamp master molds.
Once individual masters are produced, CLL is used for high-resolution, high-throughput, low-cost pattern fabrication. This method enables patterns to be transferred to underlying substrates, and multiple-stamping strategies can be used to produce high-fidelity nanometer-scale patterns on gold substrates, with the additional possibility of patterning different materials, such as silicon, germanium, platinum and graphene.
The patterns fabricated demonstrate that CLL not only transfers large-area, high-fidelity patterns, but the postlift-off exposed gold areas are advantageous for producing multiplexed patterned surfaces for selective capture of biomolecules from complex mixtures.
|Contact: Jennifer Marcus|
University of California - Los Angeles