Electrochemically grown rough-textured nanowires
Nanowires with a rough surface texture show unusual electronic, optical, and chemical properties; however, there are only a few existing methods for producing these nanowires. Here, we describe two methods for growing both free standing and lithographically patterned gold (Au) nanowires with a rough surface texture. The first strategy is based on the deposition of nanowires from a silver (Ag)–Au plating solution mixture that precipitates an Ag–Au cyanide complex during electrodeposition at low current densities. This complex disperses in the plating solution, thereby altering the nanowire growth to yield a rough surface texture. These nanowires are mass produced in alumina membranes. The second strategy produces long and rough Au nanowires on lithographically patternable nickel edge templates with corrugations formed by partial etching. These rough nanowires can be easily arrayed and integrated with microscale devices.
KeywordsRoughness Nanowire Alumina template Lithographic template Synthesis methods
We thank Gloria Olivier for FTIR and Mark Koontz with SEM imaging. We thank J. H. Wang for reproducing rough-textured nanowires. This effort was sponsored in part by the National Consortium for Measurement and Signature (MASINT) Intelligence. Directed by Congress, the Secretary of Defense established the NCMR to leverage basic research at Universities, National Laboratories, and in industry. The NCMR serves as an incubator for cutting-edge MASINT research for the Intelligence Community (IC) and steward for the advancement of MASINT as a vital contributor to national security.
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