Integrated fabrication and magnetic positioning of metallic and polymeric nanowires embedded in thin epoxy slabs.
This paper describes a process for the fabrication and positioning of nanowires (of Au, Pd, and conjugated polymers) embedded in thin epoxy slabs. The procedure has four steps: (i) coembedding a thin film of metal or conducting polymer with a thin film of nickel metal (Ni) in epoxy; (ii) sectioning the embedded structures into nanowires with an ultramicrotome ("nanoskiving"); (iii) floating the epoxy sections on a pool of water; and (iv) positioning the sections with an external magnet to a desired location ("magnetic mooring"). As the water evaporates, capillary interactions cause the sections to adhere to the substrate. Both the Ni and epoxy can be etched to generate free-standing metallic nanowires. The average translational deviation in the positioning of two nanowires with respect to each other is 16 +/- 13 mum, and the average angular deviation is 3 +/- 2 degrees . Successive depositions of nanowires yield the following structures of interest for electronic and photonic applications: electrically continuous junctions of two Au nanowires, two Au nanowires spanned by a poly(3-hexylthiophene) (P3HT) nanowire; single-crystalline Au nanowires that cross; crossbar arrays of Au nanowires; crossbar arrays of Au and Pd nanowires; and a 50 x 50 array of poly(benzimidazobenzophenanthroline ladder) (BBL) nanowires. Single-crystalline Au nanowires can be placed on glass wool fibers or on microfabricated polymeric waveguides, with which the nanowire can be addressed optically.
Lipomi
Darren J
DJ
Harvard University, Department of Chemistry and Chemical Biology, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.
Ilievski
Filip
F
Wiley
Benjamin J
BJ
Deotare
Parag B
PB
Loncar
Marko
M
Whitesides
George M
GM
D004560:Electricity; D004852:Epoxy Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D008280:Magnetics; D008670:Metals / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D053770:Nanowires / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*
D004852:Epoxy Compounds; D008670:Metals; D011108:Polymers; D006046:Gold; D009532:Nickel