Bulk Synthesis and Surface Patterning of Nanoporous Metals and Alloys from Supraspherical Nanoparticle Aggregates |
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| Authors: | Rafal Klajn Timothy P. Gray Paul J. Wesson Benjamin D. Myers Vinayak P. Dravid Stoyan K. Smoukov Bartosz A. Grzybowski |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208 (USA);2. Department of Chemistry, Northwestern University Evanston, IL 60208 (USA);3. Department of Materials Science and Engineering and NUANCE Center, Northwestern University, Evanston, IL 60208 (USA) |
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| Abstract: | Supraspheres (SS) composed of hundreds to thousands of metal nanoparticles (NPs) and crosslinked by dithiol linkers are assembled into larger structures, which are subsequently converted into nanoporous metals (NMs). Conversion is achieved by heating which removes organic molecules stabilizing the NPs and allows for NP fusion. Heating of SS solutions leads to NMs of overall macroscopic dimensions; localized radiation using collimated electron beam is used to prepare metallized surface micropatterns. Depending on the composition of supraspherical precursors, nanoporous materials composed of up to three metals can be obtained. Strategies for controlling pore size and nanoscale surface roughness of these materials are discussed. |
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| Keywords: | alloys nanoparticles nanostructures porous metals surface patterning |
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