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Correlating Nanostructure, Optical and Electronic Properties of Nanogranular Silver Layers during Polymer-Template-Assisted Sputter Deposition
Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.;Tech Univ Munich, Phys Dept, Lehrstuhl Funkt Mat, James Franck Str 1, D-85748 Garching, Germany..ORCID iD: 0000-0001-5514-8158
Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany..
Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany..
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics. Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany..ORCID iD: 0000-0001-5789-6299
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2019 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 11, no 32, p. 29416-29426Article in journal (Refereed) Published
Abstract [en]

Tailoring the optical and electronic properties of nanostructured polymer-metal composites demonstrates great potential for efficient fabrication of modern organic optical and electronic devices such as flexible sensors, transistors, diodes, or photovoltaics. Self-assembled polymer metal nanocomposites offer an excellent perspective for creating hierarchical nanostructures on macroscopic scales by simple bottom-up processes. We investigate the growth processes of nanogranular silver (Ag) layers on diblock copolymer thin film templates during sputter deposition. The Ag growth is strongly driven by self-assembly and selective wetting on the lamella structure of polystyrene-block-poly (methyl methacrylate). We correlate the emerging nanoscale morphologies with collective optical and electronic properties and quantify the difference in Ag growth on the corresponding homopolymer thin films. Thus, we are able to determine the influence of the respective polymer template and observe substrate effects on the Ag cluster percolation threshold, which affects the insulator-to-metal transition (IMT). Optical spectroscopy in the UV-vis regime reveals localized surface plasmon resonance for the metal polymer composite. Their maximum absorption is observed around the IMT due to the subsequent long-range electron conduction in percolated nanogranular Ag layers. Using X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy, we identify the oxidation of Ag at the acrylate side chains as an essential influencing factor driving the selective wetting behavior in the early growth stages. The results of polymer-templated cluster growth are corroborated by atomic force microscopy and field emission scanning electron microscopy.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 11, no 32, p. 29416-29426
Keywords [en]
polymer-metal interface, metal cluster percolation, growth kinetics, GISAXS, block copolymer
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-257808DOI: 10.1021/acsami.9b08594ISI: 000481567100090PubMedID: 31313904Scopus ID: 2-s2.0-85071352839OAI: oai:DiVA.org:kth-257808DiVA, id: diva2:1350803
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QC 20190912

Available from: 2019-09-12 Created: 2019-09-12 Last updated: 2019-09-12Bibliographically approved

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Brett, CalvinRoth, Stephan V.

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