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Issue 66, 2017, Issue in Progress
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Light filter tailoring – the impact of light emitting diode irradiation on the morphology and optical properties of silver nanoparticles within polyethylenimine thin films

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Abstract

In this contribution in situ emission filter generation for, e.g. fluorescence light detection by morphology tailoring of silver nanoparticles within a polymer layer, is presented for the first time. After depositing a pretreated film of polyethylenimine containing spherical silver nanoparticles the composite layer was irradiated with green LEDs (peak wavelength 530 nm). This leads to a morphology change of the silver nanoparticles and therefore to a change in absorption properties of the resulting polymer film with an absorption maximum at 550 nm. This tailoring of silver nanoparticles embedded in a transparent polymer matrix could address many novel applications such as adaptable light filters for future lab-on-a-chip applications. A LED for fluorescence light excitation was used to illuminate the silver nanoparticles, which led to an increasing absorption of that particular light spectrum, and therefore in situ produced a fluorescence emission filter. The effect of the treatment time, the silver ion concentration, and the temperature at which the “light-shaping” was done was studied. The silver nanoparticles were investigated using UV/Vis-spectroscopy and scanning electron microscopy. The observed nanoparticle shapes give reasons for a novel hypothesis of nanoparticle evolution. The forced plasmon oscillation seems to cause excited regions at the silver nanoparticles where adsorbed silver ions are preferably photoreduced. This results in the possibility of tailoring the morphology and therefore the optical properties of the growing nanoparticles.

Graphical abstract: Light filter tailoring – the impact of light emitting diode irradiation on the morphology and optical properties of silver nanoparticles within polyethylenimine thin films

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Publication details

The article was received on 27 Jul 2017, accepted on 21 Aug 2017 and first published on 25 Aug 2017


Article type: Paper
DOI: 10.1039/C7RA08293B
Citation: RSC Adv., 2017,7, 41603-41609
  • Open access: Creative Commons BY-NC license
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    Light filter tailoring – the impact of light emitting diode irradiation on the morphology and optical properties of silver nanoparticles within polyethylenimine thin films

    F. Kemper, E. Beckert, R. Eberhardt and A. Tünnermann, RSC Adv., 2017, 7, 41603
    DOI: 10.1039/C7RA08293B

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