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Formation of nanopore membranes and nanowires by high energy ion irradiation of polymer foils

Ensinger, Wolfgang :
Formation of nanopore membranes and nanowires by high energy ion irradiation of polymer foils.
In: Surface and Coatings Technology, 201 (19-20) pp. 8442-8447.
[Article] , (2007)

Abstract

Foils of polyimide and polycarbonate were irradiated with highly energetic heavy ions, such as gold and lead. The latent ion tracks in the polymer are cylinders of radiation damage. Along them, the polymer can be chemically etched. Cylindrical pores are created. Thus, nanopore membranes with pores with diameters around 100 nm can be fabricated. The areal pore density corresponds to the ion fluence, and the pore diameter depends on the chemical etching conditions. The nanopore membranes can be used for separating gas mixtures. This is demonstrated with mixtures of CO and CO2. In a second step, the nanopores can be galvanically filled with metal. By removing the polymer matrix, nanowires can be gained. Their shape depends on the pore shape, and their microstructure depends on the galvanic growth conditions. Nanowires of copper, permalloy, and gold were fabricated. They were investigated by scanning electron microscope for their diameter and shape. The nanowires with diameters from 70 nm to 300 nm were cylindrical with a smooth contour. For the gold nanowires, it is demonstrated that they can be grown both poly- and single crystalline, depending on the galvanic growth conditions.

Item Type: Article
Erschienen: 2007
Creators: Ensinger, Wolfgang
Title: Formation of nanopore membranes and nanowires by high energy ion irradiation of polymer foils
Language: English
Abstract:

Foils of polyimide and polycarbonate were irradiated with highly energetic heavy ions, such as gold and lead. The latent ion tracks in the polymer are cylinders of radiation damage. Along them, the polymer can be chemically etched. Cylindrical pores are created. Thus, nanopore membranes with pores with diameters around 100 nm can be fabricated. The areal pore density corresponds to the ion fluence, and the pore diameter depends on the chemical etching conditions. The nanopore membranes can be used for separating gas mixtures. This is demonstrated with mixtures of CO and CO2. In a second step, the nanopores can be galvanically filled with metal. By removing the polymer matrix, nanowires can be gained. Their shape depends on the pore shape, and their microstructure depends on the galvanic growth conditions. Nanowires of copper, permalloy, and gold were fabricated. They were investigated by scanning electron microscope for their diameter and shape. The nanowires with diameters from 70 nm to 300 nm were cylindrical with a smooth contour. For the gold nanowires, it is demonstrated that they can be grown both poly- and single crystalline, depending on the galvanic growth conditions.

Journal or Publication Title: Surface and Coatings Technology
Volume: 201
Number: 19-20
Publisher: Elsevier
Uncontrolled Keywords: Polyimide; Nanopores; Nanofilters; Nanowires
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Nov 2008 08:28
Additional Information:

The author gratefully acknowledges fruitful collaboration with D. Severin, S. Karim, Ch. Trautmann, M.E. Toimil-Molares, R. Sudowe, P. Vater, R. Neumann, and R. Brandt.

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