Water-Based, Defect-Free and Biocompatible 2d Material Inks for Printed Devices on Paper

Solution processing of 2D materials [1] allows simple and low-cost techniques, such as ink-jet printing, to be used for fabrication of heterostructure-based devices of arbitrary complexity. However, the success of this technology is determined by the nature and quality of the inks used. In this talk, I will describe a simple formulation approach that allows production of highly concentrated, defect-free, printable, and water-based 2D crystal formulations, designed to provide optimal film formation for multi-stack fabrication [2]. I will give examples of all-inkjet printed arrays of photosensors on plastic [2], programmable logic memory devices [2], capacitors [3], and transistors on paper [3,4]. Furthermore, we have combined inkjet printing with materials produced by chemical vapor deposition, demonstrating simple and quick fabrication of complex circuits on paper, such as high-gain inverters, logic gates, and current mirrors [5]. Finally, I will show that graphene inks can be used to print highly sensitive strain gauges on paper [6], and I will demonstrate their compatibility with a new flexible and sustainable substrate [7] that allows achieving highly resilient strain sensors, compared to paper.

References

[1] Coleman et al, Science 331, 568 (2011)

[2] McManus et al, Nature Nano, 12, 343 (2017)

[3] Worsley et al, ACS Nano, 2018, DOI: 10.1021/acsnano.8b06464

[4] Lu et al, ACS Nano, 13, 11263 (2019)

[5] Conti et al, Nature comms, 11, 1 (2020)

[6] Casiraghi et al, Carbon, 129, 462 (2018)

[7] Worsely at al, in preparation