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Conductive Screen Printing Inks by Gelation of Graphene Dispersions
Author(s) -
Arapov Kirill,
Rubingh Eric,
Abbel Robert,
Laven Jozua,
de With Gijsbertus,
Friedrich Heiner
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201504030
Subject(s) - graphene , materials science , inkwell , printed electronics , annealing (glass) , nanotechnology , electrical conductor , screen printing , doping , electronics , polymer , composite material , chemical engineering , optoelectronics , electrical engineering , engineering
This paper describes the gelation of highly concentrated graphene/polymer dispersions triggered by mild heating. The gel formation is only dependent on the concentration of graphene with 3.25 mg mL −1 as the minimum value for graphene network formation. The graphene gel is then utilized for the preparation of colloidally stable and highly concentrated (52 mg mL −1 ) graphene pastes that demonstrate excellent performance in screen printing down to lines of 40 μm in width. Printed patterns dried at 100 °C for only 5 min exhibit sheet resistances of 30 Ω −1 at 25 μm thickness, thus, removing the need for long‐time high temperature annealing, doping, or other treatments. Such a low drying temperature, high printing definition, and compatibility with industrially relevant plastic and paper substrates brings high‐volume roll‐to‐roll application in printed flexible electronics within reach.