title: Anisotropic Electroless Deposition on DNA Origami Templates To Form Small Diameter Conductive Nanowires.
abstract: An improved method for the metallization of DNA origami is examined in this work. DNA origami, a simple and robust method for creating a wide variety of nanostructured shapes and patterns, provides an enabling template for bottom-up fabrication of next-generation nanodevices. Selective metallization of these DNA templates is needed to make nanoelectronic devices. Here, we demonstrate a metallization process that uses gold nanorod seeds followed by anisotropic plating to provide improved morphology and greater control of the final metallized width of the structure. In our approach, gold nanorods are attached to an origami template to create a seed layer. Electroless gold deposition is then used to fill the gaps between seeds in order to create continuous, conductive nanowires. Importantly, growth during electroless deposition occurs preferentially in the length direction at a rate that is approximately 4 times the growth rate in the width direction, which enables fabrication of narrow, continuous wires. The electrical properties of 49 nanowires with widths ranging from 13 to 29 nm were characterized, and resistivity values as low as 8.9 × 10-7Ω·m were measured. The anisotropic metallization process presented here represents important progress toward the creation of nanoelectronic devices by molecularly directed placement of functional components onto self-assembled biological templates.
authors.affiliation: Department of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Physics and Astronomy, Brigham Young University , Provo, Utah 84602, United States.
authors.forename: Bibek
authors.initials: B
authors.lastname: Uprety
authors.affiliation: Department of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Physics and Astronomy, Brigham Young University , Provo, Utah 84602, United States.
authors.forename: Tyler
authors.initials: T
authors.lastname: Westover
authors.affiliation: Department of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Physics and Astronomy, Brigham Young University , Provo, Utah 84602, United States.
authors.forename: Michael
authors.initials: M
authors.lastname: Stoddard
authors.affiliation: Department of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Physics and Astronomy, Brigham Young University , Provo, Utah 84602, United States.
authors.forename: Kamron
authors.initials: K
authors.lastname: Brinkerhoff
authors.affiliation: Department of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Physics and Astronomy, Brigham Young University , Provo, Utah 84602, United States.
authors.forename: John
authors.initials: J
authors.lastname: Jensen
authors.affiliation: Department of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Physics and Astronomy, Brigham Young University , Provo, Utah 84602, United States.
authors.forename: Robert C
authors.initials: RC
authors.lastname: Davis
authors.affiliation: Department of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Physics and Astronomy, Brigham Young University , Provo, Utah 84602, United States.
authors.forename: Adam T
authors.initials: AT
authors.lastname: Woolley
authors.affiliation: Department of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Physics and Astronomy, Brigham Young University , Provo, Utah 84602, United States.
authors.forename: John N
authors.identifier: 0000-0002-4258-859X
authors.initials: JN
authors.lastname: Harb
mesh_terms: D016880:Anisotropy; D004247:DNA / Q000737:chemistry*; D004553:Electric Conductivity; D004595:Electroplating; D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry; D043942:Nanotubes / Q000737:chemistry; D053770:Nanowires / Q000737:chemistry*; D009690:Nucleic Acid Conformation; D010316:Particle Size
chemical_list: D006046:Gold; D004247:DNA