DNA-templated Free-standing Nanowires with Controllable Dimensions for In-situ TEM Analysis

Author

Mani, S. ; Han, J. ; Saif, T. ; Richter, G. ; Arzt, E.

Author_Institution

Department of Mechanical Engineering, University of Illinois, Urbana-Champaign, Urbana, U.S.A, smanil@uiuc.edu

Volume

2

fYear

2006

fDate

17-20 June 2006

Firstpage

537

Lastpage

539

Abstract

We present a method to fabricate free-standing nanowires of various metals with controllable dimensions using λ-DNA as template for in situ Transmission electron microscopic observations. The nanowires were formed by sputter depositing or evaporating metal on DNA-strands bridging Focused Ion Beam cut narrow trenches on circular silicon heating platforms (3mm dia.). The platforms were microfabricated and compatible with any commercially available TEM holder. The nanowire dimensions (20-100 nm in diameter and 1-5 μm in length) were varied by controlling the deposition time and trench width. In situ observation during thermal annealing showed no grain growth in Al and sporadic grain growth in Au. The reason for no grain growth in Al could be due to Aluminum oxidle and surface morphology. Continued annealing of the Al nanowires melted the metal leaving behind aluminum oxide nanotubes.

Keywords

DNA; Nanowires; TEM; grain growth; nanotubes; Aluminum oxide; Annealing; Gold; Heating; Ion beams; Nanotubes; Nanowires; Silicon; Surface morphology; Transmission electron microscopy; DNA; Nanowires; TEM; grain growth; nanotubes;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology, 2006. IEEE-NANO 2006. Sixth IEEE Conference on

Print_ISBN

1-4244-0077-5

Type

conf

DOI

10.1109/NANO.2006.247707

Filename

1717157