Publication date: 31st March 2013
We present the synthesis of porous membranes with interconnected nanochannels by ion-track technology and the subsequent fabrication of 3D nanowire networks by electrodeposition [1,2]. To create the polymer templates, foils (thickness between 10 and 90 µm) are irradiated sequentially several times at the UNILAC linear accelerator facility of GSI with ~ 2 GeV Au ions under an angle of 45°. After each irradiation step, the foils are rotated by 90° about the surface normal. Thus, after chemical etching of the ion tracks, membranes consisting of interconnected nanochannels are obtained. The channel diameter increases with the etching time and can be adjusted between ~ 15 nm and few µm. The interconnectivity of the channels is adjusted by the irradiation parameters (ion fluence and number of sequential irradiation steps).
By electrochemical deposition in the interconnected nanochannels, 3D nanowire networks have been created. Scanning electron microscopy investigations on Pt and Sb nanowire networks after dissolution of the polymer membrane reveal how the degree of interconnectivity and the mechanical stability are adjusted by the fabrication parameters. Currently, nanowire networks of various materials are being synthesized. The electrodeposition parameters and thus composition and crystalline quality of the nanowires are being optimized.
[1] Rauber M. et al. Nano Letters 2011, 11, 2304–2310. [2] Toimil-Molares M.E., Beilstein J. Nanotechnol. 2012, 3, 860–883.
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