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Grinding of Nano-Graphite Inkjet Inks for Application in Organic Solar Cells

Grinding of Nano-Graphite Inkjet Inks for Application in Organic Solar Cells

Julia Kastner, Iurii Gnatiuk, Michael Wagner, Dieter Holzinger, Victoria Rudelstorfer, Günter Hesser, Anita Fuchsbauer, Sabine Hild

Nanotechnology. 2019 Jan 25;30(4):045601.

PMID: 30465544

Abstract:

The production of printable graphene flakes is not easy to scale up when produced by ultrasonication and purified by centrifugation. In this work, natural graphite flakes were exfoliated by wet ball milling in water supported by the addition of sodium deoxycholate as a surfactant and the dispersion was formulated for inkjet printing. By subsequent dilution and filtration of the milling paste, more than 45 l of a stable dispersion of nano-graphite particles in one batch process was obtained. The dispersion was characterized by thermogravimetric analysis and UV-vis spectroscopy to determine concentration, and experiments to measure long-term stability were conducted. The nano-graphite particles were analyzed by optical microscopy, scanning electron microscopy and Raman spectroscopy, revealing 300-400 nm sized particles. The dispersion was formulated into an inkjet ink and tested as interfacial hole transport layer between the anode and the photo-active bulk-heterojunction layer of an organic solar cell with inverted structure. The nano-graphite flakes are inkjet printable and conductive and therefore show potential as a low-cost alternative to polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS71421	Graphene ink in water			Price

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