Additive-free, single step formulations of MXene-in-water inks are developed from clay-like titanium carbide (Ti3C2) sediments. Solution-processable Ti3C2 inks are compatible with stamping, printing, painting, and writing on a variety of substrates. Specifically, MXene-in-water inks at higher concentrations of 30 mg mL−1 are employed in commercially available pens for dispensing and patterning 2D MXene directly. These MXene pens are employed either manually or automatically using an AxiDraw, enabling direct-writing and complex patterning of functional MXene devices. Versatile MXene pens show compatible writing on a variety of substrates, including paper and polymers, where the deposited ink is used as a passive circuit, similar to silver and copper nanoparticle inks. Written MXene lines without additional post-treatment exhibit length dependent resistance, showing typical resistivity values between carbon based and metal nanoparticle inks. Current collector-free fabrication of MXene micro-supercapacitors is demonstrated on unconventional platforms including paper, textiles, and curved surfaces directly.
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: E.Q. and T.S.M. contributed equally to this work. The authors would like to thank Bilen Akuzum for assistance with the rheology measurements and Saleesha Sin for help with photography and videography during this study. Research reported in this publication was partially supported by King Abdullah University of Science and Technology (KAUST) under the KAUST-Drexel CRG grant. MXene synthesis and electrochemical characterization of the MXene inks were supported by the Fluid Interface Reactions, Structures & Transport (FIRST) center, an Energy Frontier Research Center funded by the US Department of Energy (DOE), Office of Basic Energy Sciences. T.S.M. and M.A. were funded through support from the FIRST Energy Frontier Research Center. XRD and SEM were performed at the Centralized Research Facilities (CRF) at Drexel University.