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Issue 4, 2019
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Amphiphilic diblock copolymer-mediated structure control in nanoporous germanium-based thin films

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Abstract

Fabrication of porous, foam-like germanium-based (Ge-based) nanostructures is achieved with the use of the amphiphilic diblock copolymer polystyrene-b-polyethylene oxide as structure directing agent. Basic concepts of block copolymer assisted sol–gel synthesis are successfully realized based on the [Ge9]4− Zintl clusters as a precursor for Ge-based thin films. Material/elemental composition and crystalline Ge-based phases are investigated via X-ray photoelectron spectroscopy and X-ray diffraction measurements, respectively. Poor-good solvent pair induced phase separation leads to pore sizes in the Ge-based films up to 40 nm, which can be tuned through a change of the molar mixing ratio between polymer template and precursor as proven by grazing incidence small angle X-ray scattering and scanning electron microscopy.

Graphical abstract: Amphiphilic diblock copolymer-mediated structure control in nanoporous germanium-based thin films

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Publication details

The article was received on 21 Nov 2018, accepted on 08 Jan 2019 and first published on 09 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR09427F
Citation: Nanoscale, 2019,11, 2048-2055
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    Amphiphilic diblock copolymer-mediated structure control in nanoporous germanium-based thin films

    N. Hohn, A. E. Hetzenecker, M. A. Giebel, S. Geier, L. Bießmann, V. Körstgens, N. Saxena, J. Schlipf, W. Ohm, P. S. Deimel, F. Allegretti, J. V. Barth, S. V. Roth, T. F. Fässler and P. Müller-Buschbaum, Nanoscale, 2019, 11, 2048
    DOI: 10.1039/C8NR09427F

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