Journal
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
Volume 6, Issue -, Pages 472-479Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.6.48
Keywords
atomic layer deposition (ALD); ion-track technology; nanochannels; polycarbonate; silica (SiO2); small angle X-ray scattering (SAXS); track-etched channels; X-ray photoelectron spectroscopy (XPS)
Funding
- Deutsche Forschungs-gemeinschaft [DFG-FOR1583]
- HGS-Hire
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Polycarbonate etched ion-track membranes with about 30 mu m long and 50 nm wide cylindrical channels were conformally coated with SiO2 by atomic layer deposition (ALD). The process was performed at 50 degrees C to avoid thermal damage to the polymer membrane. Analysis of the coated membranes by small angle X-ray scattering (SAXS) reveals a homogeneous, conformal layer of SiO2 in the channels at a deposition rate of 1.7-1.8 angstrom per ALD cycle. Characterization by infrared and X-ray photoelectron spectroscopy (XPS) confirms the stoichiometric composition of the SiO2 films. Detailed XPS analysis reveals that the mechanism of SiO2 formation is based on subsurface crystal growth. By dissolving the polymer, the silica nanotubes are released from the iontrack membrane. The thickness of the tube wall is well controlled by the ALD process. Because the track-etched channels exhibited diameters in the range of nanometres and lengths in the range of micrometres, cylindrical tubes with an aspect ratio as large as 3000 have been produced.
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